Tip & How-To about Dodge D150

Removing a two piece rear main seal

When removing a two piece rear main seal without a sneaky pete, it can be very overwhelming here's how... First unbolt the transmission and slide it back just so that the input shaft is not in the way of taking of a clutch and/ or fly wheel. Then drain all engine oil and remove filter. Next remove the oil pan ( but be careful that none of the old pan gasket gets in the bearing caps, or crankshaft). Then next remove the oil pump( watch the gasket on this also so it doesn't fall down inside the pump pickup tube). Then your going to want to loosen the main baring cap bolts starting from the back of the block then going to the front( not to much just enough to get the pressure of the upper main seal and the crankshaft, but you will need to take the cap bolts on the very back one at the back of the block all the way out thus the bottom rear seal is in it). Remove the bottom rear seal by pulling it out (sometimes using a flat head screwdriver), and then put the new one in by dipping it in fresh oil and simply pushing it in the groove big tab side forward. Next take a screw and a small drill or screwdriver and lightly screw it into one side of the rubber on the seal in sort of a upwards diagnal pattern ( be very careful not to scar the crankshaft). Then grab the screw with the pair of pliers and lightly tap on them with a (small) hammer or the end of a screwdriver. next take the new seal dip it in fresh oil and slide it back in, in a clockwise pattern. Next put the bolts back in the baring cap with the new seal in it , and just snug them down. Then starting with the (R) front bearing cap bolt start tightening them back down to the engines given torque specs in a zig zag pattern tighten every other one all the way back to the back of the block, then back to the front. Put your new seal on the oil pump then bolt this back up to the torque specs listed for that vehicle. Next put on the rear pan gasket (if it's a four piece gasket) then put the front pan gasket on the pan. Next by using small amounts of high temp silicone put a dab on every corner it touches another gasket piece and bolt it back up ( torque specs vary depending on vehicle usually between 12 and 18 foot lbs.) Then bolt the fly wheel and/ or clutch back up. Slide your transmission in the aligned whole and bolt it back up. put on the oil filter and fill it with oil. Start the vehicle and check for leeks, if there's leeks tighten the pan generously and check again. Thank You and I hope this has helped.

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2 Answers

need to find a way to put in a rear main seal in my 1989 jeep cherokee 4.0 without pulling the transmission

The Rear main seal on a Cherokee with the 4.0L is a 2-piece seal and the transmission doesn't have to be pulled. You have to remove the oil pan and rear main cap. That's it. The transmission doesn't have to be removed. Hope this helps.

Best of luck

Jun 18, 2010 | 1989 Jeep Cherokee

1 Answer

how do i take out a rear main seal?

Remove the transmission, after holding the rear of the engine supported, using a jack with a piece of wood between it and the engine. Remove the clutch and pressure plate, and the flywheel or if automatic, the flex plate. The rear main seal retainer will then be exposed. Remove the 2 oil pan to main seal retainer assembly, and the bolts circling the retainer, and slide the retainer assembly unit back off the crankshaft. Remove the old gasket from the retainer, and clean the gasket ridge before installing a new gasket. It's a one piece hard rubber gasket, which must be inserted in the retainer evenly. This can be done on a work bench, or flat wood on a concrete floor, Some light oil might help it seat easier, Once seated slide the retainer containing the new gasket back over the rear of the crankshaft, A rubber hammer will help ease it back into position, Replace all bolts, not forgetting the oil pan to retainer bolts, and reinstall all parts in reverse order of removal. If a manual trans, this would be an excellent time to install a new clutch kit.

Jan 11, 2010 | 1989 Mazda B-Series

1 Answer

how do i replace a rear main seal in a 5.8 motor

The first thing you have to do is access the seal. That means removing the transmission, bellhousing, clutch or converter, and flywheel or flexplate. After that you have to determine if your seal is a one or two piece. If it's a one piece, the change is simple. Ply the old seal out. Be careful and take your time. You don't want to damage the sealing machined surface of the crankshaft. After the old seal is out, grease the sealing surface of the new seal. Install the seal evenly and slowly so as not to cause distortion.
If you have a two piece seal, you'll have to remove everything previously listed along with dropping the oil pan. Next you'll have to remove the rear mail bearing cap. From the cap remove one half of the seal. Be careful not to drop the cap or damage the bearing. Install the new half in the cap being sure that it is fully seated. If done properly you'll have excess seal sticking out at both ends. Trim them off and set the cap off to the side. Next you'll need a tool called a sneaky pete. Follow the instructions and remove the old seal that is still in the engine block. Install in reverse and trim as with the cap seal. Next, dab a light coat of silicone sealer on the ends that you trimmed on the cap and reinstall the cap to the proper torque.

Oct 12, 2009 | 1985 Ford F150

2 Answers

oil leak out the rear main seal on a 2000 ford explorer

First, the easiest way IS to remove the transmission, it is a one piece seal, if it were a 2 piece, you would need to remove the oil pan and Rear Main Bearing Cap which in my opinion is alot tougher. When installing the new seal, make sure the the end of the crankshaft is clean of debris, lube the seal before sliding it over the end of the crankshaft to ease installation and some like to apply a thin coat of high temp sealant to the outside surface of the new seal to ensure no leakage. When reinstalling the flywheel/flex plate, proper torque is key because you dont want it working loose and having to remove the transmission again.

Mar 03, 2009 | 1999 Ford Explorer

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