1998 4.3L front main seal

[Collins803]

I have replaced the front main seal and cover assembly 4 times. Oil continues to leak from the seal. 1998 GMC c1500 4.3L has 213,****** miles. Any idea on why it keeps leaking? Has a new harmonic balancer also

[Grumpy Bear]

Worn shaft. Speedi Sleeve. 

[Collins803]

I’ve ordered a sleeve, I’ll update when it’s installed, thank you.

[Brian Lindsey]

is that an oem seal or aftermarket, these trucks are very picky on what parts you put on it, my suggestion would be get a gm seal and try that, and on the bigger 5.7 they tell you not to reuse cover , replace both when doing seal , your 4.3 might be the same way

[Grumpy Bear]

13 hours ago, Collins803 said:

I’ve ordered a sleeve, I’ll update when it’s installed, thank you.

 

Your welcome. Seals are also picky about the finish. The Speedi Sleeve will have that finish. Happy motoring. 

[Grumpy Bear]

Any news on this repair? 

[Collins803]

Got the sleeve installed yesterday, doesn’t appear to be leaking but have to take care of an oil pan leak, after that I will know for sure.

[Brian Lindsey]

you should have dropped the oil pan when replacing timing cover , its the only way to get it to seal , timing cover install first then oil pan , otherwise it will never seal correctly

[Collins803]

I know this thank you

[Brian Lindsey]

just trying to be helpful