Can only take SWAGs:
- oil pressure relief valve
- bypass valve in oil filter (have you recently changed the oil and filter?)
- something wrong in the oil pump (broken gear/vane)
- something in the pump drive (off the cam)
- blockage in the pickup tube causing cavitation
Before we started our BN2's engine after a rebuild, we spun the engine
over on the starter with the plugs out. The oil pressure gauge would
pump up to 30psi or so, then drop below 20, then pump up, etc. every
couple of seconds. At speed, there's probably some pulsation in the oil
pressure but it happens quickly enough--and the air in the oil pressure
line probably absorbs the pulses--so you don't see it in normal
operation. But, obviously, your problem is worse.
bs
David Masucci wrote:
> My BJ8 has always had typical oil pressure and still does. The engine
> runs great and makes no bad noises. But all of a sudden the oil gauge
> is oscillating a lot! It will chatter over a 20-30 pound range when
> the engine is at 2500 RPM or so. Even at idle it's chattering back and
> forth. I've seen similar things before when there's air in the oil
> line, but this is a lot worse.
>
> The engine seems fine...I hope. What could do this? Can the relief
> valve do this?
>
> Thanks,
> Dave
>
> BJ8
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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