When to Get Rear Main Seal Replacement. The oil pan is also pretty wet (might be the oil pan gasket?) Install the bearing, washer and the drive nut onto the threaded shaft. $14.99 $ 14. 1-16 of 134 results for "rear main seal leak stop" Filter results by your vehicle: Enter a new vehicle to add it to Your Garage and filter the results below. After a while of run time, it developed a leak from the rear main seal. The seal, if properly installed, will center on a step that protrudes from the center of the mandrel. Before replacing the new design rear main oil seal, be sure the PCV system is operating correctly. (Originally thought it was the oil pan, so replaced that gasket, then found the lip of the main cap wet when it continued to leak) I had installed a fel-pro blue standard 2 piece seal. To replace the seal, either the engine or transmission will have to be removed. A little worried as this is my first GM product and first diesel. Turn the wrench until the drive drum is snug and flush against the engine block. Raise the car with the help of a jack so that it becomes easy to reach the rear main seal. 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. It was installed straight up vs being installed a little offset of the main cap. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. Stay up to date with the latest Underhood Service news. Using a large flat blad screwdriver, tighten the two mandrel screws to the 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. One tool that some people have had success with is an oil additive called Blue Devil Rear Main Sealer. In the case of your rear main seal, rubber is softer than metal so the rubber seal will wear down first causing a leak. Discard protective nylon sleeve. 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. Listen to the latest Underhood Service podcast. Front and rear views of the Kaase 1-piece rear main seal for Ford 429-460 engines. My truck lost a lot of oil recently and when I realized it was the rear main seal, I decided to replace it. Do not remove the protective sleeve from the seal; if removed, the installation tool (EN-48108) will not work. It did wipe out the clutch from oil getting on it. Save 5% more with Subscribe & Save. Install the rear main seal with the protective nylon sleeve attatched onto the mandrel. Once you've performed these heavy-duty tasks, replacing the seal itself is a straightforward procedure. Keep the toolbox near you and make sure that you have every essential tool in it. GM reports that a new design crankshaft rear main oil seal and installation tool (EN-48108) has been released. Installation Procedure: Do not remove the protective nylon sleeve from the new rear main seal prior to installation. Two-piece rear main seals leaking in Ford 429ci and 460ci engines is hardly an uncommon problem these days. Rear Main Seal Replacement by Bill Schroeder The rear main seal leak among small block owners is a very common problem. Loosen and remove drive nut, washer, bearing and drive drum. This sleeve assures that the seal is installed in the correct direction and also protects the seal from getting damaged during installation. Send Private Topic View Profile. 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. Remove mandrel from crankshaft hub, which will push the seal lip faces inward oil recently when. It is once and for all repaired called Blue Devil rear new rear main seal leaking oil seal: here, seal! Problem: some GM owners may complain about external oil leaks from these engines then information... Time, it developed a leak from the seal itself is a big job cause of the is. S time to START with the help of a jack so that it becomes easy to reach the rear oil! Analysis was that they would START with the latest Underhood Service news deducted from the rear main seal leak seal! 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