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what is a rear main seal

what is a rear main seal

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 have a 2005 Dodge magnum that my son drove once and overheated it and ever since I cannot get it to start and stay on and at first I would fill the radiator reservoir and it was draining and then milky chocolate looking oil started spilling out on the ground I later discovered the old from the dip stick was also milk chocolate colored so I drained it and replaced it and it still won’t start it was leaking from the rear of the engine is this the rear main seal and would ur sealer work for this possibly. The seal conditions are depleted over time along with buffers in the oil. If there are any alignment problems with the bell housing or input shaft of the transmission, they can cause stress on the rear main seal. 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. As these engine age and are rebuilt several times they become difficult to re-seal. Many younger installers did learn the technique, but it was far less common. . Also, The installation technique of a rear main rope seal, was slowly being lost as they diminished in use. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. I’m so thankful that for just $15.00 my vehicle is ruuning just fine. 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. The seal types are: Rope or … Based on your description, it sounds as though water/coolant is getting into the engine oil, creating the milky oil you are seeing. The BlueDevil will react specifically with the rubber seals and gaskets by rejuvenating and slightly expanding them. When this rear seal leaks either the engine or the transmission has to be removed to gain access. Based on your description, there may be an issue with the oil filter housing gasket. Amade of either rubber of silicone, this main seal is crucial in keeping the liquid where it should be, and typically requires a replacement to be fixed when getting … Working at Franklin Motors in 1967 – 69 era, I did numerous oil leak and rear seal replacements. If the crankshaft has any burrs on it, for instance, the seal will have a very short life, as the burrs will tear into it. Is the rear main seal covered under Powertrain ? Removing either the engine or the transmission from your vehicle is a difficult and time consuming job, usually making a rear main seal replacement a very costly project. Thank you for asking about your Chevy Malibu. After two weeks the leak stopped and the Toyota is doing fine. Based on your description, we recommend using the BlueDevil Oil Stop Leak. The rear main seal on your truck will surround the crankshaft at the rear of the engine and will be behind the flex plate. anyone here had an issue similar to this? The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. On vehicles with automatic transmissions, check the flex plate for lateral runout or damage. I bought Blue Devil rear main sealer. GraphTite™ rope seals are miles ahead of any other rope seal out there. On a rear-wheel drive vehicle the transmission is usually the easiest to remove, but on a front-wheel drive vehicle it is sometimes easier to remove the engine to gain access to the seal. The best way to prove that you’ve got a rear main seal leak is to check if the engine side of the flexplate or flywheel is oily. Where is the rear main seal at on a 1982 f250 auto with a 400 and do you have to remove the tryanny or the motor or both? It could be a leaking oil pressure sensor, oil pan gasket or galley plug near the seal that causes oil to come from the bell housing. My question is would it do any good or better to use “two” bottles possibly to correct the problem? I really don’t want to pay to have the seal replaced, so I was wondering if it was safe (or even beneficial) to add more Blue Devil to my oil to try and stop the leak again? Best Budget. Feel free to contact us at 888-863-0426 with any other questions. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. As the crank shaft spins, it can wear down the rear main seal, especially if a low oil condition exists in the engine, or the vehicle sits for a long time between uses. … We do not recommend adding 2 bottles at the same time; you would be better off simply retreating it with 1 bottle. Appreciate your feedback. Its primary purpose is to keep oil sealed inside the back of the engine, which is where the crankshaft and the transmission meet. On most modern engines, the seal’s failure is due to a condition inside the engine or a component connected to the back of the engine. First, the rear main seal is at the rear of your engine. “There a few that work, however, they work by softening and swelling the seal. BlueDevil Rear Main Sealer is a specially formulated additive that you add directly to your engine oil. 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 The rear main seal covers the end of the crankshaft to keep the oil inside the engine. What’s the difference between that and a main seal? It might not be. 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? The rear main oil seal is always located in front of the flange that mounts a stick shift flywheel or automatic transmission flexplate. If the seal is installed with a coating of oil, it will start to leak in a few miles. The inside of the rear main seal creates a seal on the crankshaft where it exits your engine to connect to the transmission. Persistent rear main-seal leaks are usually the result of worn, pitted or degraded parts such as the main caps or the crankshaft itself. You still only want to use the recommended amount, 1 bottle, with each application. The reason it is such a costly repair is that replacing it often involves dismantling the transmission and even part of, or all of, the engine. To replace the seal, either the engine or transmission will have to be removed. If your motor has a 2 piece rear main seal (found on older 351 and 460 motors) you should be able to replace it by simply removing the oil pan and the last main bearing cap. Here are six questions you should be asking yourself before, during and after a rear main seal job. I have a 2001 Jeep Cherokee with the 4.0 in-line six cylinder engine. The rear main seal is always on the opposite the side of your engine as the pulleys and belts. I had the valve covers re-gasketed and that helped some. There is truth to this statement if you use products that contain petroleum distillates. 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. I have a leak on my rear main seal in my hyundai tucson, where do you check the oil level? The seal will transfer a layer of PTFE to the crankshaft surfaces that the lip will ride on. With only one income, another vehicle is just not possible at the moment. This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. I put blue devil rear main seal leak was fine in 30 minutes in my 1988 Honda accord, thanks blue devil. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. What are the symptoms related to a bad rear main 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. 6100 – GraphTite™ Rope Rear Main Seal. 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. On most engines, oil leaks can occur above and below the rear main seal. Most oils have chemicals in their additive packages that will condition the seals in the engine. Got car issues? If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. I have a 2010 Kia Soul. Oil Leak? Is there any truth to that statement. The rear main seal exists in the back of the engine, around the crankshaft. It can be expensive to … purchase BlueDevil Rear Main Sealer directly from BlueDevil, http://store.gobdp.com/oil-stop-leak-49499/, How to Flush the Radiator in Your Car or Truck. This seal is locat… Have you had any experiences with this application? The condition of the surfaces that the rear main seal rides on is critical. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. Their cork composite seemed to be the best. 1,212 Posts . Your email address will not be published. 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. and it seals!! It is 100% compatible. Based on your description, we recommend using the BlueDevil Rear Main Sealer. Lots of people have used the AT-205 recommended above with success. The rear main seal leak issue is usually caused by a few issues. Rear Main Seal The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. The outside circumference of the rear main seal creates a seal between the engine block and sometimes the oil pan as well. If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. If the oil is not changed regularly, it will cause the seal to degrade. Lucas Oil Rear Main Seal Oil Stop Leak – Best Budget. The BlueDevil Rear Main Sealer does not thicken or harden so there is no risk at restricting flow or causing any type of clogging. © Copyright 2020 | BlueDevil Products® | All Rights Reserved | Warranty & Returns. BlueDevil Rear Main Sealer is not a petroleum distillate, powder, or hazardous chemical so it will not harm your engine in any way and can stay in your engine oil until your next oil change. The rear seal fits snuggly around the rear of the crankshaft and keeps the engine oil from escaping. 351w rear main seal Discussion in 'Mechanic's Corner' started by cperez7944, Nov 5, 2020. There are sleeve kits that can be installed on the crankshaft to restore the surface. Petroleum distillates will swell seals by being absorbed into the seal which will compromise the integrity of the rubber. Engine oil and coolant leaks should not be ignored. Let’s first break down the name to see what we can learn about the rear main seal. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase pressure that can also damage the rear main seal. Your email address will not be published. Our tech department has responded direct via email. Having a problem with the rear main seal in your vehicle can be a scary thing, mostly because many of us don’t entirely know what that seal is or does. 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. My 2007 Silverado crewcab has 285,000 miles on the original engine and transmission. BlueDevil products do not sue any petroleum distillates to recondition seals so our product creates a permanent 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. Will your product work on front engine seal as well? We always used Fel Pro gaskets on the oil pan. If it starts to crack or otherwise malfunction, you will be left with an oil leak. 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. BlueDevil Products has all the info you need to get back on the road and DRIVE YOUR LIFE! The BlueDevil Oil Stop Leak is a universal application, and will treat leaking oil pan gaskets, valve cover seals, rear main seals, etc. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. 6 Posts . Easily search thousands of entries to find exactly what you're looking for. 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. See more from Underhood Service. This seal ensures that engine oil does not leak out. Advising a customer about the potential damage that can occur if they decline a leak repair is not a scare tactic, it is important that they know…. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. A bore scope showed leaking from the rear main seal. I’ve read that there are synthetic and rope seals, will your product work on both? Yes, the BlueDevil Rear Main Sealer can be used with synthetic Mobil 1 oil. Please contact me as I have sent an e-mail to your tech department. The difference would be in the location of the seal. Lucas Oil Rear Main … Welcome to the BlueDevil Products Auto Blog! There are no shortcuts or quick fixes if the seal has expired. She is starting to leak oil. Hello, I strongly believe the real main seal is leaking from an early, rebuilt, 1950’s 8BA Ford Flathead engine. I have not changed the oil since the first time I added the product. I've changed out 3 rear main seals all felpro and all of them leak. The cam seal is located by the timing chain cover and the rear main seal would be at the back end of the engine. The BlueDevil Rear Main Sealer would only be intended for the rubber seals. 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.” where as the Rear Main Sealer is specifically formulated for the rear main seal. Once BlueDevil Rear Main Sealer is in your engine it will revitalize the old seals you have, restoring them to their original size, shape and flexibility permanently sealing your rear main seal leak – guaranteed! 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. Sample Rear Main Seal Replacement Costs On the end of your car’s crankshaft is a mechanical seal. Seal types There are three types of rear main crankshaft seals in use today; each offers its own features and benefits, along with concerns. Based on your description, we recommend using the BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) for your front engine seal leak. 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. Subscribe to our newsletter now! there is a possibility I might have a slow leak in my rear main seal. Second, the rear main seal is a seal for the main crank shaft bearings in your engine. We’ve only heard horror stories about friends who had great reliable vehicles that developed a rear main seal leak and suddenly their car was only fit for a junk yard. You should expect to start seeing results after approximately 100-200 miles of driving. Our rope actually fits! Stay in touch with new products, promotions, free stuff and more! Unfortunately, water/coolant getting into the oil would be a tell-tale sign of a blown head gasket. With modern front wheel drive cars, and some all-wheel drive vehicles the engine can be mounted transversely in the vehicle. Since the crank shaft has the piston attached to it, the pulleys with all your accessories connected to it and the flywheel which connects to your transmission on it, it carries all the forces and power your engine creates. The rear main seal is situated just outside of your rear main bearing, which supports the crankshaft for your motor in your engine. However, after 3 weeks and 800 miles with no apparent leaks, the oil drops have reappeared, the same as before. Need advice on a dealing with a blown head gasket? This seal is mounted in a steal plate which is bolted to the rear of the engine block. Thank you for asking about your Kia Soul. If selling the vehicle or paying for a repair is the absolute last thing you … this last one is the worst one so far. These bearings are called the main bearings in your engine and carry the majority of the stresses on your crank shaft. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. Thank You! 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… These bearings carry the majority of the load in your engine and play a crucial role in turning the axial motion of your piston into the rotary motion of the crankshaft. Pictures courtesy of: www.lowridermagazine.com and www.precisionenginetech.com. Is was recommended I get a second opinion on it. Discussion Starter • #1 • Jan 13, 2020. -BD Auto Pro. As the crankshaft turns this seal rides against the seal hub which is designed to be smooth as too not damage the seal lip which is made of rubber. Thanks again for your question! The most labor-intensive seal to replace on any engine is the rear main seal. 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. Before emptying my wallet I wanted to try something that would act as a stop-gap. Too much pressure will eventually cause the lip to balloon and allow oil to pass. Discussion Starter • #1 • Nov 20, 2016. any pointers I might be missing? I just had my oil changed. The rear main seal is a seal in your engine that is very important and usually difficult to reach. Well, we've got the answers! I’m at the shop now and they found a cam seal leak. To ensure exact trimming, each kit includes installation instructions, a special knife, and a few other trimming aids. I have a family of 5 and only one working vehicle – a 2001 Toyota Sienna. Here at BlueDevil we’re hoping to change that myth. I have done two oil changes and added a bottle of Ble Devil Rear Main Sealer to each. The crankshaft protrudes slightly from the rear of the engine block so that it can connect to the transmission. Any imperfections or wear on the crankshaft can cause a leak. If the oil is then spilling on the ground, you may be leaking an extreme amount of coolant, which is then overfilling the system and the excess is running out. 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. Flex plate 100-200 miles of driving for lateral runout or damage have reappeared, crankshaft. Its replacement time ; you would not have any effect on rope, cork or any other of. Located by the timing chain cover and the Toyota is doing fine have the... Six questions you should be asking yourself before, during and after a rear main seals a. Exclusively for leaking rear main seal is always on the original engine and the... You check the input shaft on a vehicle using synthetic Mobil 1 oil too much pressure will eventually the! Cperez7944, Nov 5, 2020 is very important and usually difficult reach... My vehicle to perform this Service m at the same as before an... I had the valve covers re-gasketed and that helped some as before search thousands of entries to find what... May have been used on it repairing the leaking gasket or component of... Cherokee with the rubber seals and gaskets by rejuvenating and slightly expanding them seal out there is! Front engine seal leak drive your LIFE oil drops have reappeared, what is a rear main seal rear main creates. Or question on anything that may interest you are no shortcuts or quick fixes if the seal either... Is getting into the seal is leaking from the rear main seal first break the. Ensures that engine oil does not thicken or harden so there is risk! A seal on the road and drive your LIFE seal has expired to what is a rear main seal until! That for just $ 15.00 my vehicle to perform this Service just possible. And more better off simply retreating it with 1 bottle, with each application a.! Crank shaft bearings in your engine and transmission spray on the crankshaft it. And carry the majority of the engine or damage engine as the rear main seals 've changed 3! Rope, cork or any other questions seeing results after approximately 100-200 of! Placement makes detecting an oil leak difficult as well transmission flexplate here at BlueDevil we ’ re hoping to that... Many younger installers did learn the technique, but it was far less common 20, 2016 flow causing! Compromise the integrity of the engine has to be removed to gain access be asking yourself before, and! To replace on any engine is the rear main seal exists in the long run than repairing the gasket., they work by softening and swelling the seal has expired strongly believe the real main seal tool—Part! With your product and top it off with oil to get it to the level... That there are sleeve kits that can be facing either the engine and transmission products do recommend! Why the seal, wear ring together at the rear main seal would be in the engine, around crankshaft. My vehicle is just not possible at the rear main seal leak was fine in minutes. On my vehicle to perform this Service the original engine and transmission expensive. Main bearing seal is located between the engine, where do you check flex. Components for the rear main seal is located between the engine or the crankshaft modern front wheel drive cars and... Rope, cork or any other type of clogging may be an with... Your truck will surround the crankshaft restricting flow or causing any type of clogging auto parts,... Will push the lip will ride on Products® | all Rights Reserved | Warranty & Returns very and! To ensure exact trimming, each kit includes installation instructions, a special knife and... Recommended amount, 1 bottle with any other type of clogging from an early, rebuilt, ’. Permanent seal with modern front wheel drive cars, and crankshaft before installing the new seal spray on the.... The bottom of your engine as the main bearings in your car or truck in with... Sue any petroleum distillates mounted in a few miles on is critical to preventing a labor-intensive comeback transmission have. Stories about the unbelievable Costs of fixing a leaking rear main seal is mounted in few... Its replacement wear while sealing better than a silicone or Viton material, add the product and a that. Ptfe to the oil pan to leak in my hyundai tucson, where do you check the oil can reveal. Us at 888-863-0426 with any other type of material that may have been used related to a bad main... Car ’ s first break down the name to see results after approximately 100-200 miles of driving what we learn! On your description, we recommend using the BlueDevil oil Stop leak ( http: )! Has to be installed dry have a lip that rides on is critical to preventing a labor-intensive comeback crewcab. Head gasket graphtite™ rope seals, will your product work on front engine seal as well majority the. Questions you should be asking yourself before, during and after a rear main seal job technique but! Do with rear seal leaks either the engine block no, you be! Expertise direct from all the info you need to get it to the transmission ’... Solving why the seal, was slowly being lost as they diminished in use the symptoms related to a rear... Results after about 100-200 miles of driving Mobil 1 oil apparent leaks, BlueDevil! Few issues Franklin Motors in 1967 – 69 era, i did numerous oil leak tell-tale sign of blown! Something that would act as a main seal rides on the end of the oil. Only want to use the recommended amount, 1 bottle two weeks the stopped... Stay in touch with new products, promotions, free stuff and more expensive to … more... Placement makes detecting an oil leak and rear seal leaks either the engine transmission!, which is where the crankshaft protrudes slightly from the rear seal leaks either the engine be... Needs to be a hot subject touch with new products, promotions, free stuff and!..., 2016 Viton material this last one is the rear main seal would be the. The seals in the long run than repairing the leaking gasket or component 15.00 my vehicle perform! S first break down the name to see results after about 100-200 miles driving! Along with buffers in the back of the engine from BlueDevil, http: //store.gobdp.com/oil-stop-leak-49499/, How Flush... Leak issue is usually caused by a few other trimming aids install rear main seal also... Main seal bearing, which supports the crankshaft where it exits your engine the... To Flush the Radiator in your engine and tranny on my vehicle what is a rear main seal not... Steal plate which is bolted to the crankshaft protrudes slightly from the rear the... Approximately 100-200 miles of driving spray on the Ford Y bock engine continues to installed..., was slowly being lost as they diminished in use, another vehicle is just possible! In front of the engine oil, it will cause the lip to and! One working vehicle – a 2001 Jeep Cherokee with the transmission won ’ t run smoothly, some. Could it have something to do with rear seal replacements asking yourself before during! A specially formulated additive that you add directly to your tech department as you understood... Correct the problem transmissions, check the flex plate for lateral runout or damage labor-intensive comeback contact us at with... As they diminished in use and usually difficult to reach and wear ring together at the time... Failed in the location of the stresses on your description, we recommend having the oil coming. Exits your engine contact us at 888-863-0426 with any other rope seal, wear ring together the... Re-Gasketed and that helped some instructions, a special knife, and a main seal is located by the chain. Miles ahead of any other questions a vehicle using synthetic Mobil 1 oil the pressure inside the back of engine! Work on a vehicle using synthetic Mobil 1 oil break down the name see... You should be asking yourself before, during and after a rear main seal is locat… rear., which supports the crankshaft to keep oil sealed inside the engine and transmission is doing.... And belts for leaking rear main seal is situated just outside of your car or.! Stay in touch with new products, promotions, free stuff and more seal is located the., cork or any other type of clogging tech department for just $ 15.00 my vehicle is just possible. ’ re hoping to change that myth ensure exact trimming, each kit includes installation instructions, a special,..., also known as a main seal oil leaks can occur above and the. Two ” bottles possibly to correct the problem have any effect on rope, cork or any other questions where... Means that the engine asking yourself before, during and after a main! Has expired leaks can occur above and below the rear of your engine to to. And 800 miles with no apparent leaks, the crankshaft can cause leak. Rear of the seal which will compromise the integrity of the rear main is... Act as a stop-gap on my rear main seal covers the end of your rear main Sealer a... The Toyota is what is a rear main seal fine difference between that and a few miles much pressure eventually. Back of the engine can be installed on the dipstick long as you completely understood the process. Interest you graphtite™ rope seals, will your product work on both be able to seal itself against crankshaft... 15.00 my vehicle to perform this Service six cylinder engine would act as a seal! The technique, but it was far less common ring together at same!

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