Was getting the wagon ready ready for the Willlys Reunion and cleaned up the motor, noticed an oil leak.
Decided to make an attempt at doing the rear main seal, in the vehicle and without dropping the crank or drivetrain.
It can be done but by myself It was a real bear, but the Sneaky Pete saved the day. I didn't even have to drop the crank or remove anything other than the oil pan, pulley guard and of course the rear bearing retainer.
My old style seal was neoprene so I ordered one and also a newer rope for backup and also a nos rope set just in case. The bearing retainer wiggled out with the bottom half of the oil seal attached, needle nose pliers and a chopstick made short work of the upper half and since the seal was identical to the new neoprene I that would be my first choice. After a bit of cleanup to the oil pan gasket surfaces, oil pan clean and respray, it was time to get after it.
It was clear pretty quickly that the new upper oil seal wasn't just plug and play. Even with the Sneaky Pete I just couldn't get the seal started onto the crank. Slept on it and decided to try the rope seals and they are much larger and even more impossible to pull through. Finally a buddy came by and somehow he held in the clutch while turning the motor by hand, while I simultaneously pulled the Sneaky Pete and drove the seal in with a chopstick. Once it starts going in, be careful not to let the seal move or bind if it does simply reverse crank direction. Once you get it going, don't pull it flush, I pushed it proud about a half inch so the seals don't align with the edge of the bearing plate and leak. A dab of sealant in the retainer groove and just a smudge on the corresponding retainer shoulder, assembly lube on the bearing and pre installing the lower oil seal proud the opposite end, it slipped right in and both rubber dowels go right in tight but all the way in and sticking out .5.
Always recondition your pan, respray, check surfaces and use a new cork gasket with Indian Shellac on the oil pan and a dab of silicon on where the gaps are under the front oil pan and pulley guard bolt holes. I also put a light coat on the block itself and let everything marinate for a few before installing carefully and watching for the gasket to just start to compress, if your doing it right you can hear the shellac working. Go slow and not much more than hand tight
Notice the internals of the motor have really cleaned up well after a few thousand miles with modern 10w30 oil. Now I'll switch to Rotella 30w permanently.
Test drive went well and I ran it for better than an hour, I did see a few drops right at the bottom of the bell housing but I'm hoping that was just from the cleanup and initial run in before the seal swells a bit...
Overall, while difficult, it's not impossible on the roadside....
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