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Oil leak


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CL
New User

Jul 4, 2007, 2:52 PM

Post #1 of 4 (1700 views)
Oil leak Sign In

I have a 1989 Chevy silverado 4 x 4 with an oil leak that I believe to be coming from the rear main seal. Any advice on how to repair this?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 5, 2007, 12:36 PM

Post #2 of 4 (1696 views)
Re: Oil leak Sign In

You should verify that it is coming from the rear main seal. Clean the area and look for new leaking to rule out if it is coming from somewhere else.

Most all rear main seals will drip some with some miles and age. Techs may dissagree on this job but I believe the only way to control a problem leak for a loooong time will be to fully check out the crankshaft and have it in spec as just a slight bit of bearing wear allows the shaft to beat back the seal and will leak again in short order. There were some tricks to chase out and old and push/pull a new one thru but I don't recall a lot of success without working the crankshaft.

How fast is this leak?

T



CL
New User

Jul 5, 2007, 12:58 PM

Post #3 of 4 (1693 views)
Re: Oil leak Sign In

It is a pretty steady drip when the engine is hot. I looked underneath the truck to see if I could definitely tell where is was coming from, but not much luck. It appears to be more to the driver side of the engine versus the center......but I am not positive. I did notice a build up of new oil at the part of the block that the oil filter mounts to. Don`t think it is coming from the filter though. No oil at the filter threads.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 5, 2007, 6:23 PM

Post #4 of 4 (1687 views)
Re: Oil leak Sign In

Hmmm? Perhaps this isn't the rear main seal at all. Problems can be at the oil filter or sending unit for oil pressure which should be nearby. I suggest you really clean the entire area and look for the highest and farthest forward that gets oily again as the source.

It would be a shame to tear into this and not know the source. It really sounds like it could be something else. Keep in mind about all rear mains will have some oil around them when older. I don't hear of too many problems with these anymore but that could just be my own experience.

You know what they say -- "measure twice, cut once"

T







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