John Darke
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1984 M20K with TSIO 360 engine. Experiencing low oil pressure, especially when oil temperature is high. Thought it may be the oil pressure relief valve so purchased new spring, plunger and gasket. Discovered that the seat of the valve has some pitting and should be lapped. Does anyone have any information on a tool that has been developed to lap the seat of the oil pressure relief valve? Any information would be greatly appreciated.
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My 1984 231 has similar problems as mentioned above in these threads. I purchased new spring, plunger and gasket but there is also pitting in the seat of the valve. Does anyone have information on how to lap the seat of the valve? Is there a special tool available? Would appreciate any help and I will gladly follow through with results from our exercises at this end.