My dad's '90 just strated leaking a ton of oil since the last time he changed it. He said it's coming from the filter mount. It's a '90 4.3l, C2500. Any ideas how to fix this sucker, are there o-rings to replace inside the mount?

Originally posted by erikrs301
My dad's '90 just strated leaking a ton of oil since the last time he changed it. He said it's coming from the filter mount. It's a '90 4.3l, C2500. Any ideas how to fix this sucker, are there o-rings to replace inside the mount?

change filter.....Might be wrong one or even worse he went to a "jiffy lube" and they cross threaded it.... :mad3:

Originally posted by Shaker


change filter.....Might be wrong one or even worse he went to a "jiffy lube" and they cross threaded it.... :mad3:

Well, we wouldn't dare go anywhere for something as simple as an oil change...talk about wasting mod $$$.:D I guess it could just be a faulty filter.

My XJ's 4.0l has 3 o-rings in the filter mount, I was wondering if the 4.3l had a similar setup and could be causing the problem.

Pull the filter to see if the old O Ring stayed on the block. Some brands of filters are notorious for the o ring sticking.

Does it have an factory oil cooler? If so the o-rings tend to get hard and break. GM sells a reseal kit for the adapter, its like $10 Has everything to reseal the adapter. Pretty typical thing actually. Still need to check the filter for double gaskets.

OK, that's what I was looking for, some kinda seal kit. It may have an oil cooler since the original owner got it with some sort of truck camper hauling package.

Originally posted by erikrs301
OK, that's what I was looking for, some kinda seal kit. It may have an oil cooler since the original owner got it with some sort of truck camper hauling package.

Yep, I have changed about 10 of this things. Very common thing to happen.

Dissassemble and clean. Reassemble with new gaskets and o-rings. Done! :D