| Oil pressure flutter [message #366947] |
Sat, 25 September 2021 07:55  |
Cymadesign
Messages: 7
Registered: June 2021
Location: Port Colborne, ON Canada
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I have an intermittent oil pressure fluctuation. The pressure drops about 5-10 psi at random. In a 4 hour drive, the fluctuation will occur 2 or three times. I’ll watch the needle move up and down for a few minutes and then it will return to normal and stay there until the next random event. The fluctuations can occur at either normal highway speed and at idle. 1974 455 with 80,000 miles. The cross-over has not been blocked. New oil pressure sensor and all the wiring has been checked twice for loose connections. The coach is new to me 4 months ago, but I did not notice this behaviour when I drove it the 2,500 miles home. Normal oil pressure as speed is just below the halfway marker on the gauge. Idle is at just below the 1/4 marker.
The only explanation I can come up with is something intermittently blocking the oil pump inlet. Could enough carbon from the turkey tray collect in the sump? From what I have read here, I can’t remove the oil pan with the engine in place.
Any theories or suggestions for things to investigate?
Nk you
1974 26’ 455, 90,000 miles, pertronix, aluminum rad, headers
Port Colborne, ON Canada. Southern end of the Welland Canal
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