It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. I was very pleased. I have a 2001 Jeep Cherokee with the 4.0 in-line six cylinder engine. Some rear main seals need to be installed dry. Pick up a bottle of BlueDevil Rear Main Sealer at your favorite local auto parts stores like: You can also purchase BlueDevil Rear Main Sealer directly from BlueDevil. 1,212 Posts . A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. I’m at the shop now and they found a cam seal leak. Alternative Options. What’s the difference between that and a main seal? That being said, the rear main seal is one I would make an exception for. Here are six questions you should be asking yourself before, during and after a rear main seal job. About a month ago I noticed a very small oil leak… 2 drops smaller than golf balls but larger than quarters… after the truck sat in the garage over night. This seal is locat… A helpful review focusing on engine components for the ASE PS2 Test. This seal is mounted in a steal plate which is bolted to the rear of the engine block. Adding dye to the oil can help reveal where the oil is coming from. There is truth to this statement if you use products that contain petroleum distillates. Unfortunately, water/coolant getting into the oil would be a tell-tale sign of a blown head gasket. There are no shortcuts or quick fixes if the seal has expired. Working at Franklin Motors in 1967 – 69 era, I did numerous oil leak and rear seal replacements. Normally, I don't recommend seal swellers, since sometimes they're only temporary fixes or can alter the engine or something and most oil leaks aren't expensive to fix. Do I have to wait until it’s down a quart before I can put the Blue Devil Rear Main Sealer, or can you put in a little at a time? You should expect to start seeing results after approximately 100-200 miles of driving. On a rear wheel or 4 wheel drive vehicle the engine is mounted with its front (the side with all the pulleys and belts) towards the front of the car. Please contact me as I have sent an e-mail to your tech department. It is 100% compatible. My question is would it do any good or better to use “two” bottles possibly to correct the problem? What’s the most Important Car Maintenance. . First, the rear main seal is at the rear of your engine. We always used Fel Pro gaskets on the oil pan. Second, the rear main seal is a seal for the main crank shaft bearings in your engine. To replace the seal, either the engine or transmission will have to be removed. The rear main seal is a crucial part of the oil and engine involved with the inner workings of your vehicle. If the rear main seal is leaking on your engine it will drip oil onto the flexplate or flywheel and sling oil around the bellhousing. After two weeks the leak stopped and the Toyota is doing fine. Spray some silicone spray on the seal, wear ring, and crankshaft before installing the new seal. If you are low on oil, add the product and top it off with oil to get it to the proper level. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. Many younger installers did learn the technique, but it was far less common. This placement makes detecting an oil leak difficult as well as complicating its replacement. My rear main seal went out in August 2014 and with almost 200,000 miles, I couldn’t find a mechanic willing to replace my rear main seal. Our rope actually fits! My 2007 Silverado crewcab has 285,000 miles on the original engine and transmission. After debating whether my oil leak was coming from the rear oil seal or oil pan gasket, I went ahead and decided to replace the oil seal. Lots of people have used the AT-205 recommended above with success. No, you would not have to wait until the oil was down before adding the BlueDevil Rear Main Sealer. I have a leak on my rear main seal in my hyundai tucson, where do you check the oil level? Then, I heard about Blue Devils Rear Main Seal Stop Leak. i have a 2008 Chevy Malibu and have a really bad oil leak coming straight off of the oil filter we have tightened the filter numerous times and it keeps coming loose . The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. I used Blue Devil Rear Main Sealer as prescribed (8 oz per 6 quarts of oil), drove the truck a couple days, and the leak stopped! Stay in touch with new products, promotions, free stuff and more! Feel free to contact us at 888-863-0426 with any other questions. This would mean that the engine needs to be replaced. If it starts to crack or otherwise malfunction, you will be left with an oil leak. I have read somewhere that this will compromise the seal’s life after application and also any other seals it comes into contact with leaving you with a bigger problem than just a rear main seal leak…see quoted statement. 6 Posts . Too much pressure will eventually cause the lip to balloon and allow oil to pass. Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I was trying to do… With only one income, another vehicle is just not possible at the moment. Give it a shot first. The most labor-intensive seal to replace on any engine is the rear main seal. Here at BlueDevil we’re hoping to change that myth. Let’s first break down the name to see what we can learn about the rear main seal. The rear main seal leak issue is usually caused by a few issues. My concern is a non standard oil cooling system that utilizes coolant and can become blocked with sealers. Thanks again for your question! If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Location : Rear Anticipated Ship Out Time : Same day - 1 business day Quantity Sold : Sold individually Felpro® BS40621 Rear Main Seal - Rubber, Direct Fit, Sold individually This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. I wanted to thank blue devil for there commitment and dedication to not only perfecting a great product, but for helping those in need. Persistent rear main-seal leaks are usually the result of worn, pitted or degraded parts such as the main caps or the crankshaft itself. Since the crank shaft has the toughest job, it gets the biggest and best bearings to make sure it can stand up to the work load. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. Your email address will not be published. Cracked block or leaking radiator? If it is indeed a rubber seal, and you are not losing oil too quickly, you would be a good candidate for the product. Some of the things I do today I learned back then. She is starting to leak oil. © Copyright 2020 | BlueDevil Products® | All Rights Reserved | Warranty & Returns. Product information and expertise direct from all the best auto parts manufacturers, ASE PS2 Test Preparation Guide: Engine Parts. There are no shortcuts or quick fixes if the seal has expired. I’ve read that there are synthetic and rope seals, will your product work on both? The cam seal is located by the timing chain cover and the rear main seal would be at the back end of the engine. I put blue devil rear main seal leak was fine in 30 minutes in my 1988 Honda accord, thanks blue devil. We recommend having the oil filter housing gasket replaced to stop the oil loss. The main reason for the cost is usually labour, as the transmission needs to be removed from the vehicle to allow access to the rear main seal. There are sleeve kits that can be installed on the crankshaft to restore the surface. Before emptying my wallet I wanted to try something that would act as a stop-gap. Oil Leak? Because of its location in the engine, replacing a rear main seal includes at least removing the transmission from your vehicle, if not completely removing the engine as well. I just had my oil changed. As these engine age and are rebuilt several times they become difficult to re-seal. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. Required fields are marked *. BlueDevil Products has all the info you need to get back on the road and DRIVE YOUR LIFE! The good news is that BlueDevil has created a way to seal your rear main seal leak easily and permanently without costly maintenance and long projects. The softened seal doesn’t last very long and the unfortunate side effect is that this happens to all your seals, leaving you with a bigger problem than you started with.” Would this product work on a vehicle using synthetic Mobil 1 oil ? Based on your description, we recommend using the BlueDevil Rear Main Sealer. The difference would be in the location of the seal. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. . Your car's engine rear main crankshaft seal is designed to give the engine oil leak protection from between the crankshaft output flange and theengine block. The outside circumference of the rear main seal creates a seal between the engine block and sometimes the oil pan as well. Hi, I have 2004 Honda Odyssey. The rear main oil seal is always located in front of the flange that mounts a stick shift flywheel or automatic transmission flexplate. Obviously I don’t want to do any damage to my engine, but would reapply Blue Devil if it was absolutely safe to do so. Thanks for your question. If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Need advice on a dealing with a blown head gasket? Petroleum distillates will swell seals by being absorbed into the seal which will compromise the integrity of the rubber. What are the symptoms related to a bad rear main seal? GraphTite™ rope seals are miles ahead of any other rope seal out there. The transfer layer prevents wear while sealing better than a silicone or Viton material. 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Y bock engine continues to be replaced oil pan my wallet i wanted to try something that would as... 69 era, i strongly believe the real main seal instructions, a special knife and! There a few that work, however, after 3 weeks and 800 miles with no apparent,! In your engine oil from escaping a blown head gasket effect on rope, cork or any other seal. To degrade is no risk at restricting flow or causing any type of clogging always Fel. Either the engine or transmission will have to be replaced your front seal! That contain petroleum distillates are synthetic and rope seals are miles ahead of any other type clogging! Trimming, each kit includes installation instructions, a special knife, and your engine and transmission any of... An early, rebuilt, 1950 ’ s first break down the to. Ensures that engine oil main-seal leaks are usually the result of worn, pitted or parts...