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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: forrest86c20 on April 08, 2008, 04:43:04 pm

Title: Oil In Air Cleaner?
Post by: forrest86c20 on April 08, 2008, 04:43:04 pm

Hi I own a 1986 Chevy C20HD with the Vin M 350 and I took off the air cleaner to change my air filter, and there was like 4 OZ worth of oil in there!

Is this normal?

Title: Re: Oil In Air Cleaner?
Post by: HAULIN IT on April 08, 2008, 05:30:28 pm

Forrest, Hate to be a wise guy, but yes it's normal............for a wore out engine with a bunch of blow-by. The oil is getting up in the valve covers under pressure, past the valve guides, then up through the breather hose. Sorry,  :'( Lorne 

Title: Re: Oil In Air Cleaner?
Post by: forrest86c20 on April 08, 2008, 06:12:14 pm

But this isnt a "wore Out Engine" this motor only has 15K miles on it

Title: Re: Oil In Air Cleaner?
Post by: Fordeatinz71 on April 08, 2008, 06:16:48 pm

well, you could have a plugged PCV valve.  if that's clear then you might wanna check into the warranty i really hope you have...

Title: Re: Oil In Air Cleaner?
Post by: forrest86c20 on April 08, 2008, 06:27:08 pm

Ok thanks I'll check that, no the warranty is gone, but it runs just fine, and it doesn't burn oil, it just bugs me lol

EDIT:

Ok The Oil is coming in from the Breather, PCV Valve looks like it could use replacement so I'll get a new one.
Could too much oil in motor cause this?

Title: Re: Oil In Air Cleaner?
Post by: 1976Scottsdale on April 08, 2008, 08:03:39 pm

I would do a compression test and a cylinder leakdown test.  When my 327 did the same thing, two pistons had broken rings on them.

Title: Re: Oil In Air Cleaner?
Post by: VileZambonie on April 08, 2008, 09:49:42 pm

Yes, make sure the oil level is correct. Replace the PCV valve and the breather element.

Title: Re: Oil In Air Cleaner?
Post by: forrest86c20 on April 12, 2008, 03:24:06 pm

Update

Replaced PCV, Breather, Plugs, Wires

I found I had a little too much oil in, doh LOL

But it's running ALOT better and no new oil in the air cleaner :D