Piston Slap: A Fireball of a 3.8L Oil Leak?

 

(photo courtesy: underhoodservice.com)

Robert writes:

I have changed the seal 2 times on my 3.8L Chevy and it still will leak. I had a place on harmonic balancer.I put the recommended slave to repair.It was not long enough to cover the bad spot on the balancer.It was close but they seal was damaged.They offer a different one that is$30+.This all occurred just out of the blue.I rebuilt the engine and it has 30,000 on it.I was wondering if there is something causing pressure around this seal.Pressure check on cylinders was good.Any ideas what to do or pressure is good too good.

Thank you sincerely – Robert

Sajeev answers:

The problem seems common, a leak behind the harmonic balancer at the crankshaft's front seal.  Or maybe I misread your letter, or googled incorrectly.

I also presume you installed this "sleeve" to repair it, but it didn't work because it was too short. The correct one, or perhaps General Motors makes a revised seal/harmonic balancer that supersedes your part number should solve the problem.  But the real problem?

I can't find a clear solution. This thread on 3800pro.com mentions blow by: excessive crankcase pressure that exacerbates an oil leak. You could bypass the PCV with a crankcase breather filter (if it won't trigger a check engine light), then clean the motor and check for leaks…

…or install LS4-FTW the "different one that is $30+" as that might be the permanent solution.

Help us out, Best and Brightest.

 

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you're in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.

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