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Power Strokes
7.3 Tech
Low oil pressure on new rebuilt motor
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[QUOTE="brewer, post: 1508465, member: 348"] Long story short, I had a rebuilt motor installed recently. Motor was built by a local machine shop and the shop that was installing it. Not dealing with the "install" shop anymore because of some bad experiences/poor management over all this. When they got the truck running, it had a knock on the rear passenger side when cold. Goes away when warm. Got the truck home, and pulled the injectors and sent them to Unlimited to look through the oil sides. Found no issues with them. Got the injectors re-installed, took the truck out for a test drive, and still have a knock cold. Cylinder contribution test and buzz test show no issues. However, [U]at warm idle,[/U] the oil pressure drops down below the 7psi cutoff for the dash gauge. Pressure comes back up with RPMs. I also have some kind of a buzzing/whine/humming noise coming from the front of the engine when cold. I am wondering if this may be the LPOP from low oil pressure although the HPOP reservoir stays full. Could also be my power steering pump. It is similar to the notorious Ford power steering whine. Measured the oil pressure at the HPOP reservoir and the oil cooler test port with a manual gauge. They both read about 50-60psi cold idle, then drop down to about 15-20psi as the truck starts to warm up after like 10 min idling. I am thinking that the passenger side oil galley plug may be missing. But could that be causing a knock too? Could it be lifter knock from low oil pressure on that side? [/QUOTE]
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Low oil pressure on new rebuilt motor
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