Originally Posted by jacob.a.gasparp
First off has anyone ever changed the rear main and does it require a special tool? I'm pretty sure mine is leaking and I know when replacing the rear main on a cat tractor diesel engine a special tool was needed.
Also these engines aren't difficult to pull are they?
Finally besides the rear main I will change out the oil pan basket. Anything else I should check while the engine is out?
I believe that if your engine has not been replaced with an older one that you will have a one piece rear main seal.They are pretty easy to remove and do not require removal of the engine, just the transmission and flywheel.
Carefully drill some small holes in the metal part of the seal, 2 holes across from each other will usually work. Thread some metal screws into the holes, clamp on the screws with some vise grips and pry and pull the seal out.
To re-install the new seal, clean the opening real good, making sure to get any metal particles out (a shop vac works good for that), wipe up any oil on the block and I like to use a bit of Loctite Stud & Bearing Mount on the outer metal rim of the seal. Lube the rubber lip of the seal where it contacts the crankshaft with some engine oil or White Lithium grease, then carefully keeping the seal straight, tap it into the opening in the block, paying close attention to the rubber seal to make sure it does not roll or get pinched and that you tap in the seal as evenly and as straight as possible.
If you have to replace the oil pan gasket, you will either need to lift and support the engine high enough to remove the pan, or completely remove the engine. Use a one piece oil pan gasket to simplify the installation and be careful to not over-tighten the oil pan retaining bolts. Also use a dab of silicone in the corners of the oil pan gasket where it goes over the front cover hump and rear main bearing cap just to be sure it does not leak.