460 oil in air cleaner housing - Ford Forums

trunner · 12-23-2008, 20:09

newbie here, I have a 1996 Ford F-450 Super Duty 156K miles. Runs great, no signs of oil coming out of tail pipe. I have huge amounts of oil in the air filter housing, both of the hoses to throttle body are oil soaked. PCV system is sucking, but pcv valve appears to be aftermarket, however, feels like plenty of vacuum pulling at bottom of valve. Spark plugs do not show signs of oil usage. Right side of engine shows no signs of leaks, or oil problems. Could this be a blocked drain return hole in the head, to the pan, on this side only. Or is there any known traits that can cause this

**jwko** · 12-23-2008, 21:18

Sounds like a blow by problem (worn rings).

trunner · 01-01-2009, 21:13

is there any know issues with vavle guides dropping causing this. I do have low compression on #7 cyl. and snap on scanner shows cyl. balance problem, but no misfires
Thank you for your response

**Paul Kane** · 01-04-2009, 22:30

The OEM head's vavle guies are machined right from the cast iron head and do not have guides pressed in (no guides or guide inserts from the factory), so a valve guide could not "drop out."

It would be best to perform a cylinder leakdown test rather than a comrpession test.

Paul