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rear main seal

J

JimS

Member
What would cause a rear main seal to only last 2 1/2 years? This particular one is on an Isuzu but I think the question is
pertinent to all rear seal. I used a drift to fully seat it. I did have a little trouble lining up the transmission. Any ideas
so I don't repeat this mistake?
 
anymore I think a lot of seals don't last as long as they use to. any weird vibration like front bearing of trans?? had one once flywheel was out of balance and took out rear main. did it twice before we were smart enough to look deeper.
Gary
 
A leaking rear main seal is often a symptom of a greater problem, typically loose main bearings.

Not sure how that engine is built, but if you have to remove the pan, be a good idea to check the mains, make an evaluation to the health of the rest of the engine.

Sometimes it's not the seal at all, could be the pan gasket, oil coming under the rear main cap (depending on the design), a galley plug, cam plug, or from somewhere above and running down. Also be sure the crankcase ventilation is clean and working. Excess blowby or restricted ventilation promotes oil leaks.

If you are the primary operator and caregiver, I have found letting the oil level drop to a quart low will sometimes slow or even stop a rear main leak.
 
Seal or crank was dirty during install, crank has a wear lip, seal went in crooked and distorted. Lip pinched or folded during install. Smacked seal too hard causing garter spring to dislodge.

Did you lube the seal during install? If you did are you sure of what kind of seal material it was made from. PTFE seals go on dry, thats for the seal and sealing surface. They do not need lube and this can make them leak.
 
Crank case pressure can make a seal or gasket leak. Check PCV system. Is this a high mileage vehicle with too much blow by?
 
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