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My first rear main leaked on my built motor because it was not installed correctly using the SST that comes with the new rear main seal. • Removing old style crankshaft rear main oil seal: Here, the seal lip faces inward. Then the new seal can be put in place, and the transmission and other parts are put back in their place. Give me a call 7313455299. Repeat the above steps as necessary, around the crankshaft rear oil seal, until the seal is removed. From my poking aroung on the discussion boards I found out many owners with this do not fix it as they seem to know it's difficult to eliminate (some say a poor design). Rear Main Seal Replacement by Bill Schroeder The rear main seal leak among small block owners is a very common problem. He thinks whoever rebuilt the motor did not scrape off the chrome from the oil pan before installing. Most engines have an inspection cover in the bellhousing that will allow you to check for this. Get it as soon as Sat, Oct 17. Using a large flat blad screwdriver, tighten the two mandrel screws to the crankshaft. $14.99 $ 14. bottle for every 8 quarts of engine oil and it should at least slow down the leak and may even stop it. As and error proof, seal will fit only one way onto the mandrel. Hey guys, I want to make sure I cover all my bases here so this vehicle is once and for all repaired. Note: The repair information only applies to above listed engines. Before replacing the new design rear main oil seal, be sure the PCV system is operating correctly. The mechanic says it's leaking 1 drop of oil every 15 seconds from rear main seal where the chrome oil pan connects. I have oil between the transmission and engine. Problem: Some GM owners may complain about external oil leaks from these engines. Turn the wrench until the drive drum is snug and flush against the engine block. Do not remove the protective sleeve from the seal; if removed, the installation tool (EN-48108) will not work. Loosen and remove drive nut, washer, bearing and drive drum. I use between 100-150 non teflon fel pro rear main seals every year with very minimal issues, the single biggest leak culprit for me is not the rear main seal, its typically the lip on the oil pan, which is easily mistaken all the time for the rear main seal leaking. Save 5% more with Subscribe & Save. Fast forward and it is once again leaking out the rear main. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. I do have valve cover gasket leak but it's really small. Discussion in 'Mazdaspeed 6 Troubleshooting' started by Sleepin6, Jun 28, 2018. For many drivers, news of such a problem means that it could be time to purchase a new vehicle, because rear main seal repair costs (money, time and hassle) typically surpass the worth of vehicles old enough to develop such leaks. Installation Procedure: Do not remove the protective nylon sleeve from the new rear main seal prior to installation. If the rear main seal was leaking on your engine it will drip oil onto the flexplate or flywheel. Pry the seal out by moving tool toward the center of crankshaft. Location: Main Index » Forum Index » Trucks-Vans-SUV » 88-98 Fullsize Trucks, Vans, Suburbans, Blazers, Tahoes » rear pinion seal STILL leaking, brand new Previous Bottom Next; Username Post: rear pinion seal STILL leaking, brand new (Topic#107493) jp233 Senior Member Posts: 1023 Loc: ATL, GA Reg: 03-15-04. Verify that the seal has seated properly. Enter a new vehicle BlueDevil Rear Main Sealer. If you're out of options, this is a fairly low cost method that has worked for some people with a leaking rear main seal. The Machine Shop replaced the front and rear main crank seal three times and it is still leaking. Front and rear views of the Kaase 1-piece rear main seal for Ford 429-460 engines. 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