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#1
09-23-2018, 10:34 PM
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M18 Oil Pressure issue
Hello all. I just bought my first 1872 super. The M18 has an issue with oil pressure after it heats up to operating temperature. I'm running 30wt oil. When I first start the engine when it's cold my oil pressure at idle is 25 psi. When I begin to mow the pressure rises to 50 psi. As I continue to mow the pressure begins to drop to around 12 psi. When I idle the engine down the pressure drops to near zero and the pressure light flickers. I've mowed with it 3 times and the above has happened each time.
This deeply concerned me so I pulled the engine and removed the closure plate to inspect the oil pump. The oil pump appears to have no problems. The pump gears appear to have no wear and the shaft is tight and turns when I turn the crank. The pressure relief ball and spring are in place. Has anyone ever experienced the spring loosing its spring tension over time allowing the ball to open and dump oil pressure. I considered stretching the spring to see if this would help the low pressure issue. I've heard of putting in a stronger spring to increase oil pressure in certain oil pumps in cars. Anywhere else the engine could be dumping oil pressure? The sleeve bearings seam to be tight and there is no rod knock. I've read in another thread that talked about the pickup screen clogging, but wouldn't it have low oil pressure when it was cold as well? Thanks for the help!
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1961 4 digit serial #9643 Original Custom Restoration 1976 1650 dual stick 1989 2072 374 Haban Deck 2001 3240 60" Deck 2A Tiller 
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