Rear oil seal leak on 1999 Toyota Camry

After waiting and gambling on the life of my timing belt I finally had it replaced today. It had also started to leak oil out of the oil pump seal so bad I couldn't drive it. The car has 194,000 miles but still runs good, the compression is between 206 and 210 on all 4 cylinders. The oil seal probably wore out due to the fact that the car sat in storage for 1 year and was only started a couple times in that span. I bit the bullet and had the timing belt, tensioners, water pump, crank seal, cam seal, oil pump seal and gasket replaced and it stopped the leak and ran fine. But now the oil is pouring out of the rear seal as bad as the front seal was before. My question is could the rear seal have been cracked or moved enough to start leaking from putting on the crank seal on the front side of the crank? Thanks

by in Daly City, CA on May 04, 2010
2 answers 1 comment
ANSWER by on May 04, 2010
Maybe when you replaced all the other seals the older, weaker seal was given more strain then before causing it to be compromised.
ANSWER by on May 15, 2010
When the front seal was changed, the crankshaft may have been moved front and backward more than normal while removing the front pulley (this is often very hard to remove) - and if that happened, the rear seal could have been damaged. One or more of the crankshaft bearings has a side collar that is designed to prevent front to back movement of the crankshaft, but these wear with mileage and I've seen crankshafts move front to back quite a bit as a result of that bearing wear with half the mileage you have. The engine wouldn't normally cause the crankshaft to move front to backward during normal driving, but the process of removing the pulley from the front of the crankshaft could have resulted in that front to back motion enough to damage the rear seal - creating a new leak. In this situation, the cause would be a worn engine - not the tech, as this wouldn't occur if the main crankshaft race bearing wear wasn't out of spec. This is what I think happened if the leak started as soon as the front seal was replaced.
COMMENT by on June 15, 2010
Hey 1californiadreamer, Thanks for your reply. I thought something like that side collar was the problem But didn't know what part had worn out with all the miles. Being broke I am forced to replace the rear seal myself. What a job this is for a $10 part. After finally getting the bolts cracked on the steering rack to sub-frame, I removed the sub-frame and tranny. Now I have to make sure I remove and install the rear seal properly.
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