Oil in the oil filter housing? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Russell · 10-09-2004, 08:32 PM

Hey guys, just going over the 74 I bought here. As I expected, the cab is in sorry shape underneith, rocker panels have been replaced with slip ons, floor has some tin to replace where it was rotted out, cab supports are basically gone, etc etc etc No big worry as my 80's cab will be going on instead. But yeah, I popped off the air cleaner lid to take a look, and while the filter is real nice, the air cleaner has a ring of black motor oil inside of it... I remember reading about this sometime before, but I can't remember what causes it.

The truck sure starts and runs nice though, its got my 80 beat for sure there...

**Palf70Step** · 10-08-2004, 10:15 PM

PCV Valve maybe. Like you I can't remember exactly. but something like to much pressure blowing it back into air cleaner. I cant remmber if they said the PCV was bad or the brether was clogged and it was backing up through the PCV.

MylilBowTie · 10-08-2004, 11:53 PM

Worn rings, causing blowby and the lack of a baffle in the valve cover where the pcv is would do it.

10-09-2004, 08:32 PM	#1
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Oil in the oil filter housing? Hey guys, just going over the 74 I bought here. As I expected, the cab is in sorry shape underneith, rocker panels have been replaced with slip ons, floor has some tin to replace where it was rotted out, cab supports are basically gone, etc etc etc No big worry as my 80's cab will be going on instead. But yeah, I popped off the air cleaner lid to take a look, and while the filter is real nice, the air cleaner has a ring of black motor oil inside of it... I remember reading about this sometime before, but I can't remember what causes it. The truck sure starts and runs nice though, its got my 80 beat for sure there... __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-08-2004, 10:15 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,787	PCV Valve maybe. Like you I can't remember exactly. but something like to much pressure blowing it back into air cleaner. I cant remmber if they said the PCV was bad or the brether was clogged and it was backing up through the PCV. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-08-2004, 11:53 PM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Worn rings, causing blowby and the lack of a baffle in the valve cover where the pcv is would do it. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI



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