Oil under Air Filter in 1991 Nissan Truck

1991 NISSAN TRUCK
Avatar
WTURKINGTON
  • MEMBER
  • 1 POST
I have replaced the PCV valve but am still getting oil blown over from the valve cover into the air filter housing. It pools there and drips out slowly.
Jun 29, 2007 at 8:08 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
2CARPRO JACK
  • CAR REPAIR CONTRIBUTOR
  • 11,533 POSTS
Sounds like you could have what is called "blow-by" On higher mileage vehicles or ones that have been stored, the piston rings will wear or lose their "seat" causing compression to pass by them, pressurizing the crankcase. The only outlet is to push it out the breather into the air cleaner
Jul 1, 2007 at 8:18 AM
Advertisement