So uh.... Time to further expose my ignorance.
So, my beloved bus has low oil pressure. It's got a 235 in it, and no dippers, and an 848 head. I don't know the year of my Canuck block, as I'm too lazy to take the starter off, so I can clearly read the digits. But I guess I should do so.
Do all 235s have high pressure oiling?
Is there such a thing as a full pressure but not high pressure 235?
Am I crazy? I figure I don't really need to worry unless it drops to zero and I hear that terrible deep death rattle that means there is no oil pressure.
When I come off the highway my pressure is low. Really low. About a needle width off of zero low. I don't hear knocking or anything, but I'm curious if it's my oil pump that's knackered or if that's normal-ish. My main bearings do have quite a bit of clearance, 4 thou. But I'd have thought the 40 weight oil would fill up the gaps a little more. Frankly I have no desire to spend $170 on an oil pump for the bus. I can seemingly drive around all day at 35-45 mph without this happening, but when I hit 50 mph for five or ten minutes (the pressure stays at about 20psi) and then come down to idle, the pressure drops like a stone.
