Repairing Your Cracked Engine Block

cracked engine blockHaving a cracked engine block can feel like the end of your vehicle’s life.  Engine swaps can be extremely expensive and often not worth the investment in your current vehicle.  Also, having a cracked block is one of those extreme cases where it may not be possible to salvage your current engine.

There are many who have attempted to repair cracked blocks.  The main difficult is that you cannot simply weld an engine block since it is made from cast iron, not steel.  It is possible to weld cast iron using an arc welder and the proper welding rods, but that often can cause deformation to your engine block, or leave the welded area far more brittle and susceptible to further cracking.  The other common attempt at fixing a cracked block is called cold metal stitching.  This process is similar to sewing two pieces of fabric together, except it is far more difficult with metal.  The main difficulty with this process is that it does not work well on components that experience drastic temperature changes as the temperature change causes swelling and shrinking of the metal which will cause the metal stitching to tear and the crack to reopen.  This process is also often prohibitively expensive and only used on very large or expensive motors such as heavy equipment, diesel engines or marine motors.

There have been a variety of other attempts at sealing cracked engine blocks like using cold welding products, 2 part epoxies or a variety of other patches and fixes.  The problem in most cases is the same as with cold metal stitching in that the wide range of operating temperatures in your vehicle’s motor along with the thermal expansion of the metal cause most repairs to only last for a short time.

Before you attempt any repair on your cracked engine block, you want to be sure that is the problem you have.  If you have an external crack in your block that you can see, then the problem is easily identified.  If you have an internal crack the symptoms can often be similar to that of a blown head gasket.  To determine if you have a blown head gasket, you can read our article about the symptoms of a blown head gasket.Cracked Engine Block

The best way to seal a cracked block is to use BlueDevil Radiator and Block Sealer.  BlueDevil Radiator and Block Sealer is a specially formulated sealing agent that you add to your vehicle’s cooling system.  BlueDevil Radiator and Block Sealer can seal your cracked block from the inside out through your vehicle’s cooling system.  It is not a fibrous or particulate sealer that can harm or clog any other areas of your cooling system.  Instead, BlueDevil Radiator and Block Sealer has a special chemical formula that will bond to the metal in your engine block at the leak point until the leak is completely sealed.  The chemical weld formed by BlueDevil Radiator and Block Sealer will create a permanent seal that can expand and contract with the temperature changes in your engine.  Since there is nothing harmful in BlueDevil Radiator and Block Sealer it can stay in your cooling system indefinitely sealing any future leaks your may have in your vehicle’s radiator or engine block.

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BlueDevil Radiator and Block sealer works so well, it comes with a guarantee of performance.  If you purchase it from BlueDevil or one of our partnering local auto parts stores we guarantee a permanent repair!

Since you’ve got nothing to lose, pick up BlueDevil Radiator and Block Sealer today!  You can purchase it directly from BlueDevil here.

Pictures provided by:

Cracked Block – By Nick Ares – Licensed by Creative Commons Share Alike 3.0 Via Flikr – Original Link

129 responses to “Repairing Your Cracked Engine Block

  1. I used Blue Devil, on an 84 Buick 5.7 Diesel Engine that had either a cracked block or a blown head gasket, and it worked very well. Sealed the leak successfully and was very happy with the product. Company Technicians were very helpful and very interested in solving my problem. Wished I still had that vehicle, as it was an Estate Wagon, pretty rare with the Diesel engine !!

  2. Do you have some customers that have been successful with sealing a engine block that I could talk to? I have a straight six that has a crack, I would like to repair.

    1. Dave-

      We have had multiple reports of the BlueDevil Radiator & Block Sealer successfully sealing a cracked/leaking engine block. We would be happy to discuss the product with & can be reached directly at 888-863-0426. We are available from 8:00 AM – 5:00 PM, Monday – Friday.

      Thank You!

      -BDP

      1. I have a 2007 odyssey with 148,000 miles it s been giving me multiples misfire took it to a specialist and they yold me that cylinder 5 is low presure it evaporates my coolant and its smells like coolant wen is warm they said i need to replace the motor it will be spencive

        1. Agustin-

          Thank you for asking about your Honda Oddyssey. It is also possible that you are getting combustion/exhaust gases pumping back into the cooling system.  You can use a “Block Dye Tester” to confirm whether or not that is the case.
          BlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure.  To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading.  If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull.  Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.  Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

          Thank you!

          -BDP

    1. Scott-

      Yes, the BlueDevil Head Gasket Sealer can be used in marine engines. The marine engine must be inboard for BlueDevil to work properly due to the fact that you need the same water to circulate for 50 minutes.

      Thank You!

      -BDP

      1. Can it be used on an inboard/outboard by increasing the concentration of the product and recirculating using a tub to provide cooling water and catch the exhausted water?

        1. Jonathan-

          As long as you are able to use a barrel/bucket to circulate the same water for the 50 minute idle. The main components you need are a combination of heat (at least 150 degrees) and circulation.

          Thank You!

          -BDP

        2. Jonathon,

          How did it work for you on your marine engine?
          When recycling the same water, did you have temperature issues?

          I am in same boat, so to speak. I have an internal block crack that is g
          letting water into oil. I am trying to avoid replacing the engine.

          I look forward to your reply
          Mac

  3. Can the radiator and block sealer be used on a marine engine? I think I have an internal Crack inside the block due to poor winterization.

      1. It is an inboard. 454 big block. Is there a mixture ratio that I need to follow. Since I will be circulating the same water out of a tank through the cooling system I wasn’t sure how many bottles I would need.

        1. Martin-

          Please contact us directly at 888-863-0426 and we will be happy to get a capacity chart to you or discuss it with you over the phone. If you purchase the 32 ounce BlueDevil Head Gasket Sealer, it does come with a capacity table printed on the bottle.

          Thank You!

          -BDP

      2. I used bars stop leak for a blown head gasket or cracked cylinder head. It fixed the water coming out of tail pipe and there is no water in the oil. However the car is losing compression and has a miss. Do you think this is a cracked cylinder and do you think your product can fix this ??

        1. Larry,

          Thanks for your question about your leak. Even if you do not have coolant in the oil or out of the exhaust you may still have a small coolant leak either from a blown head gasket or a cracked cylinder head. If you had water in your oil you could be losing compression due to corrosion of the cylinder walls or cylinder rings as well as a crack in your head, block or a partially blown head gasket. Unfortunately, to confirm any of these things you would have to tear down your engine to check.

          Thanks again for your question!
          -BD Auto Pro

        1. William-

          Yes, the BlueDevil Head Gasket Sealer would work on diesel as well as gasoline engines. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  4. What does the guarantee cover? I have a cracked block for sure. It is located right under the intake manifold where the lifters are on a 350 sbc. It is allowing coolant to mix with my oil. I’ll have to buy upper gasket set if I use this block including new head gaskets. Will the guarantee cover all my part costs? The labor I do myself.

    1. Nick-

      Yes, it will work in a 2 stroke engine. Be sure to follow the capacity chart as you will not need a whole lot to treat a cooling system of that size.

      Feel free to contact us at 888-863-0426 with any questions.

      Thank You!

      -BDP

        1. Maddness-

          As long as the vehicle will not lose more than about 1 quart of water during a 45 minute idle then there is a very good chance the BlueDevil Radiator & Block Sealer will be able to seal it. If you are losing more than that then your vehicle will require a hard part repair.

          Thank you!

          -BDP

  5. I was wondering that if you use the blue devil and it seals it,does it allow you to drive far distances without it messing up again or no?

  6. I have an 89 dodge caravan with two small cracks in the block no bigger than a penny, would this product work and should i try sealing it from the outside as well?

      1. Hello i have a 2000 Chrysler van and I have an engine block late will it help Cell that up the leak i used jD wheeler an it dent help because of the heat ….dose this product works against heat?

        1. Johnetta-

          Yes, the BlueDevil Radiator and Block Sealer would be able to help seal the leak in your Chrysler. The product is attracted to airflow. once it is introduced to the system, it will look for the temperature differentials in the system and react with heat to form a chemical weld. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  7. Hi I have twin Mercruisers I/O’s with GM 305’s on my boat with cracked blocks on the inboard side of each block. It is a fresh water boat, however there is rust residue coming from the cracked areas (which we would expect).
    1) Will the rust reside affect your products ability to seal?
    2) Do you have any solutions for circulating your product on mercruiser I/O Stern Drives ?

    Thanks

    1. Jim-

      Yes, the rust residue could potentially affect the BlueDevil’s ability to seal.

      We have had customers use the product in marine engines by circulating the same water in a barrel or bucket. The main components you will need are circulation of the same body of water (3 – 4 gallons preferably) and heat.

      Feel free to contact our tech support team at 888-863-0426 with any further questions.

      Thank You!

      -BSP

  8. my car was always over heating.. I thought it was the water pump cause water was leaking out of the bottom. We replaced that and the thermostat. We took it for a ride it it lose power, shared and heVy white smoke and water came out the exhaust… We were told it’s a blown head gasket. We bought the blue devil. Took it for a drive again, the smoke & shaking went away.. But it still over heats. I don’t know what else is wrong.

  9. If I use this product for en exterior cracked block will this prevent me from doing any future work to the motor? Someone told me after using this they were unable to remove the head without harming the head itself. It’s a 1952.

    1. Chris-

      Use of the BlueDevil product would not change the difficulty of making any future repairs. The product is attracted to airflow and reacts to temperature differential to create a chemical weld; therefore the seal created by BlueDevil will only show up at the point of any leak.

      Thanks!

      -BDP

  10. If my radiator leaks and is empty, do I need to pour some water in before pouring the product to keep the product from leaking out?

          1. Will blue devil seal a crack in a 305 inboard/outboard about 4 to 5 inches long if we circulate the same water or is that too long of a crack?

          2. Echo-

            It really depends how quickly you are losing coolant. In general, BlueDevil will have a great shot at working as long as you will not lose more than about 1 quart of water during a 50 minute idle.

            You will definitely want to circulate the same water if you decide to use BlueDevil to ensure proper results. Feel free to contact our tech support team at 888-863-0426 with any questions.

            Thank You!

            -BDP

    1. Mark-

      Unfortunately, we do not manufacture any products that are intended for an oil leak from the block. The BlueDevil Oil Stop Leak is intended specifically for rubber seals and gaskets and the Head Gasket Sealer is designed to stop coolant loss. Feel free to contact us at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    1. Jeanne-

      Yes, you can safely use the BlueDevil Head Gasket Sealer in your 1987 Vanagon. Feel free to contact us at 888-863-0426 with any questions or for further instruction.

      Thanks!

      -BDP

  11. I have a1930 model a with 2″ hairline crack in the blocks exterior . My concern is will this clog my radiator. A friend used bars and it clogged his radiator . Model a engines are an open system not under pressure . Would that make a differance ?

    1. Tom,

      Thanks for your question about your Model A. The low pressure of an open system won’t make a difference as it is the temperature differential at the leak that activates BlueDevil Radiator and Block Sealer. Similarly, BlueDevil Radiator and Block Sealer won’t clog your radiator as the temperature differentials there aren’t great enough to activate the sealing agent.

      Thanks for your question!
      -BD Auto Pro

  12. I have a 2002 Honda Accord with a 3.0 engine.
    The problem is a porous block leak.Which of your products would you recommend ?

  13. My 1996 nissan maxima leaks oil and I dont know from where but it’s a pretty bad leak I used blue devil as instructed left it running for 50 minutes with the heater full blast it didn’t really slow the leak is there a reason why and if it doesn’t stop the leak do I still get my money back guarantee

    1. Angel-

      The BlueDevil Head Gasket Sealer is only intended for coolant/water leaks. Unfortunately, we do not manufacture a product intended to stop oil leaks from the block or head gasket. Please contact our technical support at 888-863-0426 to assist you for the warranty on the product.

      Thank you!

      -BDP

  14. I have a small leak on a 1999 2 stroke motorcycle I hit something on bottom of motor and chipped a piece of the metal off just a small oil leak the problem is though it is air cooled. What might you suggest. Thanks mike

    1. Mike-

      Unfortunately, we do not manufacture any product that will seal a leak that is due to damage. Our BlueDevil Oil Stop Leak is specifically designed to rejuvenate and recondition the rubber seals/gaskets.

      The only solution may be to have the part replaced.

      Thank you!

      -BDP

      1. Lewis-

        Thank you for asking about your Dodge Ram 1500. Based on your description, we would recommend using the BlueDevil Head Gasket Sealer, found here on our website: http://store.gobdp.com/head-gasket-sealer-38386/ . As long as you are not losing water/coolant too quickly and the vehicle can maintain idle for 50 minutes, you would be a good candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

        Thank you!

        -BDP

    1. Duce-

      Please contact us at 888-863-0426 so that we may discuss the symptoms in a little more detail. We would like to have a better idea as to what the Honda is experiencing so that we are able to make the best recommendation.

      Thank you!

      -BDP

  15. I had either a blown head gasket or a crack somewhere in the engine. Was smelling gasoline in the coolant and getting small amounts of water in the oil. I used Blue Devil with some degree of apathy and pessimism. My tune changed real quick cause this stuff works. Thank you Blue Devil! Getting parts or engines is impossible in a 3rd world island.

  16. my 2009 Camry motor had small crack they said fixed with
    Blue Devil, now they’ve recalled my car for the oil enhancement
    problem replaced all pistons,rings and rods will this put
    to much stress on engine to make it undo Blue Devil’s weld

    1. Jimmy-

      Thank you for your question. Once the product seals, it would be a permanent seal. Replacing the pistons, rings and rods would not effect the weld the product created.

      Thank you!

      -BDP

  17. Hello I have a case 580c backhoe with a 207 motor with a crack between 2 cylinders it is diesel would this product work already pulled head don’t want to reassemble if it would work?

    1. Jesse,

      Thanks for your question about your Case backhoe. As long as the location with the crack is in a coolant passage BlueDevil Radiator and Block Sealer is guaranteed to seal your leak and get your backhoe running again. If the 2 cylinders do not have a water jacket between them then unfortunately you will need to have your block welded and machined.

      Thanks again for your question!
      -BD Auto Pro

  18. my car is a Mercedes benz A170, 1999 model. i just recently found out that when i put oil in the car, the oil goes straight to the radiator of the car when i put on the engine and and pump out of the radiator when i open the radiator. can your product do rapair it

    1. King-

      Unfortunately, we do not manufacture a product for the leak you have described. The BlueDevil Head Gasket Sealer is only intended for coolant leaks and the BlueDevil Oil Stop Leaks would only be for the rubber seals or rubber gaskets in the system.

      Thank you!

      -BDP

    1. Jesse-

      Yes, BlueDevil would be able to seal the leak in the block of your Landrover Discovery. The product is intended for leaks that are seeping or dripping out, so as long as you are not losing water/coolant too quickly, the product should be able to seal your leak.

      Thank you!

      -BDP

    1. Rob-

      Yes, BlueDevil is able to seal leaks coming from the block. As long as the vehicle can idle for 50 minutes without overheating or stalling out, and you are not losing more than about a quart of water/coolant during that idle period, the product should be able to seal your leak.

      Thank you!

      -BDP

  19. I have a 350 that has a sleeve on number 3 cyl. The sleeve is leaking around the top of it and the orignail part of the block.i get water in my oil and thrue my exaust pipe. Will this product work on this problem

    1. Jerry-

      Yes, BlueDevil would be able to seal the leak you have described. As long as you are not losing water/coolant too quickly and the vehicle is able to maintain idle for 50 minutes, without overheating or stalling out, you should be able to see some great results. We would also recommend changing the oil before and after the BlueDevil process.

      Thank you!

      -BDP

  20. I have a 94 6.5 turbo diesel with a crack in the 8th cylinder interior how would i use bluedevil and is it gaurented to work?

  21. hi
    i have a Peugeot 405 1800cc fuel(petrol) injection engine
    its block cracked
    is helpful your products for repair it , please tell me about how use and how much use
    thanks a lot

    1. Mehr-

      Yes, the BlueDevil Radiator & Block Sealer would be appropriate to use in your Peugeot to seal the cracked block. One 16 ounce bottle will treat up to a 3 gallon system.

      Thank you!

      -BDP

  22. Hi

    Will this product cure a crack in an aluminium block? I have a coolant leak into the oil sump from a leak between an engine sleeve and the block.

    1. Simon-

      Yes, BlueDevil would be able to help seal a leak in an aluminum block. As long as the vehicle will idle for a full 50 minutes, without overheating or stalling out, and you are not losing more than about a quart of water/coolant, then you should be able to see some good results from the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    1. Tom-

      The product does not contain any solid or particulate matter, so it will not clog or harm your cooling system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    1. John-

      Please contact us at 888-863-0426 so that we can get a better idea of the extent of your leaks. This will allow us to make the proper recommendation for your engine.

      Thank you!

      -BDP

  23. I have a 95 firebird 3.4 v6 and when the temp rises to normal it starts to smoke and I can’t tell if it’s the gasket or the block. If this stuff can help will it block or clog up anything

    1. Lance-

      Thank you for asking about your Firebird. There are no solid or particulate matter in the product, so it is non-clogging. As long as you are following the directions and using the product as intended, you wouldn’t have any issues with clogging.

      Thank you!

      -BDP

    1. Bob-

      Thank you for your question about your Saturn. Unfortunately, BlueDevil Head Gasket Sealer is not designed to stop oil from entering the cooling system or oil being lost from the head gasket. The BlueDevil Head Gasket Sealer is specifically made to stop coolant loss. We do not manufacture any products that will remedy the symptoms that your Saturn is experiencing. Your only option may be a hard part repair.

      Thanks!

      -BDP

  24. Can Blue Devil Head Gasket Repair Be Used In A Vehicle That Has No Heat Or A/C? I Have A ’93 F-150 With A 302 & I Think It Has A Blown Head Gasket.

    1. Michael-

      Thank you for asking about your Ford F-150. You can use the BlueDevil Head Gasket Sealer without the use of your heat or a/c. The direction about putting your heater on with the blower to the max is to draw heat from the engine, to keep it from overheating during that 50 minute idle. As long as the vehicle isn’t going to overheat, you should still be able to see some good results from the product.

      Thank you!

      -BDP

  25. I have a small JD lawnmower with a Yanmar 3 cylinder diesel motor. It appears that there may be an internal crack in the block/head that is allowing coolant to fill the oil pan. Is this a scenario where one of your products may be useful in repairing the internal crack? Thanks in advance!

    1. Vince-

      Thank you for asking about your John Deere Lawnmower. Based on your description, you would be a good candidate for the BlueDevil Head Gasket Sealer. You will want to change the oil before and after the BlueDevil process. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  26. Is the Blue Devil oil sealer safe for my 1974 VW Bus with a 1.8 L aircooled engine? The oil leaks are minor

    1. Gregory-

      Yes, it is 100% safe to use BlueDevil Oil Stop Leak in your 1974 VW Bus. BlueDevil Oil Stop Leak is designed to recondition, rejuvenate, and slightly expand any leaking rubber seal or gasket. BlueDevil Oil Stop Leak is not designed to work for a cracked block or leaking hard part.

      Once the product is added you can expect to start seeing results after about 100 miles of driving.

      Thank you!

      -BDP

  27. I have a 2005 Chevy Duramax diesel with blown head gasket or cracked block. Coolant system is getting pressurized from combustion, if I relieved the pressure in the coolant side manually by teeing in to the heater core piping, do you think I could relieve the pressure enough during the process to allow product to make a bond?

    1. Daniel-

      Thank you for asking about your Chevy Duramax. Relieving the pressure building up in the cooling system will give you better ciculation and hopefully help the vehicle from overheating during the 50 minute idle. A clean, free-flowing system, would be the best environment for the product, and in doing so, would give the Head Gasket Sealer the best possible chance of working properly. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  28. I recently purchased a sailboat which has a Yanmar 4HJ3-TE (four cylinder) marine diesel engine. The boat was cheap because though supposedly they had re done the head once they reassembled the motor coolant fluid leaked into the last three cylinders.

    There are three possibilities.

    1. The cylinder is cracked and coolant is flowing into the cylinders (which I assume should not be the case as this would mean three different cracks, one for each cylinder).

    2. The exhaust manifold is water cooled and could have a crack in it.

    3. The head has a crack

    4. This one would not apply, the motor was badly assembled, in this case its not your problem.

    From what I have read from your site a crack in the cylinders should seal, but would your product seal a crack in the head or the water cooled exhaust manifold?

    1. Frank-

      Thank you for your question and interest in the product! Based on your description, we recommend using the BlueDevil Head Gasket Sealer, found here: http://store.gobdp.com/head-gasket-sealer-38386/ . The Head Gasket Sealer would treat leaking heater cores, leaking freeze plugs, blown head gaskets, as well as warped/cracked heads. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  29. I am not quite sure what is wrong yet, either my head gasket is blown and/or there is a crack in the block, however I am not losing coolant, but I do seem to be losing oil. Will this work in this situation? And can Radiator and Block Sealer work in a turbocharged application?

    1. Storm-

      The BlueDevil Radiator and Block Sealer is only intended for water/coolant leaks. Based on your description, unfortunately, we do not manufacture a product for the type of leak you are experiencing. A hard part repair may be your best option.

      Hope this helps!

      -BDP

  30. I have a Ford Y Block that someone let freeze with water in it. It has a crack at the back of the block under the bell housing area. This area has no combustion pressure on it, and is away from high stress fasting points. The crack was narrow about 5″ long, varying from 1/32 to 1/16, after a bad weld repair was ground away. The repair was filled with high temp epoxy, but still leaks about 1/4 cup of antifreeze a month.

    The car has Evans Waterless coolant, which is excellent, but finds small leaks. Do you believe your sealer will be able to stop the leak without clogging my new radiator and heater core?

  31. I have 2 small cracks in the heads of my car gas motor. I saw them when I replaced the manifold , when refurbishing the engine during car restoring. The car was running good before the engine removal.If I reinstall the motor, and use your product should it seal them?

    1. J.R.-

      As long as the vehicle will maintain idle for 50 minutes, without overheating or stalling out, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a good candidate for the product. Feel free to contact our technical support team at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  32. In the event that there is a crack in the block and possibly also a leak in the cylinder head gasket – will Blue Devil Radiator & Block Sealer also seal leaks in the cylinder head gasket or do I need to use both products – ie
    Blue Devil Radiator & Block Sealer and BlueDevil Head Gasket Sealer?

    1. Terrence-

      Based on your description, the product you would want to use would be the BlueDevil Head Gasket Sealer. The product will seal leaks coming from the head gasket as well as the block. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  33. I have a marine motor. My Uncle left water in the engine and it cracked. There is a visible crack on the outside and the oil is milky. Im assuming that it is cracked on the inside as well. From what I am reading this will help. My uncle mentioned that it was overheating so would this seal before overheating and filling the oil with water?

    Rick

    1. Rick-

      It really depends on how quickly the engine is wanting to overheat. BlueDevil Radiator & Block Sealer requires that the engine is able to idle for a solid 45 minute period without stalling out or overheating. If it is able to run 45 minutes without overheating then you should have no problem sealing the leak.

      Feel free to contact our tech support team at 888-863-0426 with any further questions.

      Thank you!

      -BDP

  34. Hi!
    What product can we use to seal motor cylinder head? We have some cracks between 2 exhaust valves. Can we use Radiator and Block Seale?

    Regards, Ilja

    1. IIja-

      Based on your description, we recommend using the BlueDevil Head Gasket Sealer, found here on our website: http://store.gobdp.com/head-gasket-sealer-38386/. As long as you are not losing water/coolant too quickly, and the vehicle can maintain idle for a full 50 minutes, you would be a great candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  35. I have a 6-7 inch hairline crack in my MB 1943 block roughly in the middle of the right hand side of motor it has missed the distributor hole. It runs through the middle of the upper welch plug, and fluid is slowly weeping out at a small rate. Can your product cure this and is it a once only treatment (will it need to be replaced every time I change coolant) and most important to me will it stop the crack getting longer?

    1. Orenthal-

      BlueDevil Radiator & Block Sealer is intended for water/coolant leaks. Are you noticing a loss of water/coolant? Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s symptoms and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  36. Hello, Hello,
    My Name is Derek, I am from Nome Alaska. I have a 1991 Ford explorer. It shows roughly 75,XXX miles on it. Of course it resets after a 100,000. Anyways I bought this car this summer and i put about 6,000 miles on it, and the clutch went out, so i replaced it. After that the car started burning coolant out the exhaust, like a lot. So I stripped the car down to the block to check the head gaskets and realized the passenger side gasket was blown, and I replaced the driver side head cylinder. I didnt replace the passenger side. I should have replaced both sides at the time but just the driver side. Anyways after replacing gaskets and driver side cylinder the same problem happened within two weeks or so. So yesterday i finally had time to strip it down and took both heads off and the new head is fine, the passenger side head tho is cracked between the exhaust valves and they are leaking so I ordered a new head for the passenger side. but once back together and if i have the same problem i swear it would be internally on the engine block which i am afraid of it might be. Would this product work if the leak is internally on my engine block?!? Please let me know. Thank you

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