So tired of this problem...

[addo]

Using a drill to spin the pump, has verified that the pressure side of things is probably OK. I would guess the drill spun at a lot less than 750RPM. On a cheaper drill, 200RPM is more likely.

What if the suction side of the pump was drawing air at motor speed (as opposed to "cold cranking" speed)?

 

[james singleton]

Wallaka, According to my manual , if you have any of the following conditions: 1. your oil pressure is low 2.your oil pressure surges 3. or you have no oil pessure is to" "INSPECT THE OIL PRESURE RELIEF VALVE AND SPRING, TO ENSURE THAT IT IS NOT STICKING OR STUCK. REMOVE AND THOUROUGHLY CLEAN THE VALVE, SPRING, AND THE VALVE BODY."

If you haven't already done the above, I would think about buying a new oil pump and installing it before I would replace the engine. Or if you have the old oil pump and it was working prior to the new engine, install that one and see! Definitely easier, and cheaper to at least try this route rather than replacing the engine! I feel for you man! Good luck! Jim

 

[wallaka]

Wallaka, According to my manual , if you have any of the following conditions: 1. your oil pressure is low 2.your oil pressure surges 3. or you have no oil pessure is to" "INSPECT THE OIL PRESURE RELIEF VALVE AND SPRING, TO ENSURE THAT IT IS NOT STICKING OR STUCK. REMOVE AND THOUROUGHLY CLEAN THE VALVE, SPRING, AND THE VALVE BODY."

If you haven't already done the above, I would think about buying a new oil pump and installing it before I would replace the engine. Or if you have the old oil pump and it was working prior to the new engine, install that one and see! Definitely easier, and cheaper to at least try this route rather than replacing the engine! I feel for you man! Good luck! Jim

Yeah, I threw the old one away. It was no good anyhow, had score marks on the rotor. It's what caused the original problem.

I'll drop the pan tomorrow maybe and check the spring again. It might be broken or something, I can't really see into it and just made sure that the pressure relief moved.
I hear that the pickup is supposed to be within 1/4-1/2" of the pan, how do you measure this?

 

[CoupeBoy]

You are supposed to measure it with modeling clay. Get some, make a couple small balls of the stuff 3/8-1/2" in diameter, stick them to the bottom of the oil pickup. Then put the oil pan up into place, tighten down a few bolts to make sure it's square and fully seated (no new gasket though), then remove the pan and check to see how much your balls got squished. I've never done this but I've seen it done on TV a million times, I should be certified by now!

good luck,
-ron

 

[mjpchief]

Why don't you just measure from the gasket surface on the block to the bottom of the sump with pump mounted. Then measure the depth of the pan from the gasket surface to bottom of pan. The difference in the measurments will be your clearance.

I think that the shaft in a 170 is different than the shaft in the 200. May be wrong here, it's been about 6 yrs since I built mine.

Check and make sure that the shaft is tight in the oil pump and in the dist. shaft. then make sure it is long enough.

If you are getting 60 lbs of oil pressure with a drill then your pump is good.