Join Date: Mar 2010
Location: Stoney Creek, Ontario
60,000 kms or 60,000 miles? 1981 was pretty close to transition aftermath. Can't remember if that was a 2 piece or 1 piece seal. If it's a 2 piece, they almost always leak from the day the engine was put into service. And it would be about a couple of drops unless it was really bad. Usually 300,000 kms or more under typical conditions. It would take a couple of sticks of dynamite to get that seal to blow out. Rear main bearing cap has to come off to change it which requires dropping the oil pan. The 1 piece, and I'm sure someone will correct me on this, is either bolted on the rear of the engine or pressed into the back of the block. This seal may cause a little more concern for leaks, but not much under normal use. More concern on a motorhome because it isn't put into service as often. The seal could be dry and cracked. Both require the transmission to be moved back or removed. If your going to have the transmission removed for service in the future, then that would be the best time to have the seal looked at and/or replaced. Keep checking the oil level. If it drops significantly in a short period of time then start saving them dollars.
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