Southwind13
9/18/2005 8:55:25 PM
I have a 1991 motorhome with a Ford 460 EFI engine. When the engine is started, the oil pressure takes as long as 60 seconds to reach it's normal level. The longer the engine has been off, the longer it takes to reach it's normal level, which is about 55 psi at 3,000 rpm and about 35 psi at idle. It is as if all the oil is draining out of the all the oil galleys and the oil pump has to refill everything before the oil pressure is achieved. During this time, the hydraulic lifters are noisey. The engine has about 68,000 miles. The problem seems to be getting worse. Any one have any ideas?
Thanks,
rusty ol ranger
10/3/2005 10:14:09 PM
What kind of oil filter are you useing?
Some oil filters (Fram Espically) have a problem with oil draining out of the filter and back into the pan and then not wanting to refill right away again.
It could also be a screwed up pressure relief valve, or a oil pump getting weak.
What I would do is switch to a thicker oil....like 20W50 or so. I
later,
Dustin
