318 oil pressure
Hi. I just got a 1991 Power Ram w150 with 175,000 miles. The oil pressure light would flicker when I stopped at a red light and the pressure guage never goes more than 1/4 the way up. After reading a lot of forums, I figured the culprit was either sludge or the oil pump. I bought a new oil pump, primed it by filling it with 90w gear oil, and installed it. There was no sluge in the oil pan but I did find chipped off pieces of the rubber oil pan gasket in the oil pump screen. After installing the pump and adding fresh 10w30 oil, i started it up. The oil pressure guage stayed at dead zero while I ran the engine a good 20 seconds. The top end started to clatter a little bit so I shut it off. I'm afraid to start it up again without any pressure. It's about 25-30 degrees out here. Any suggestions?