Excess pressure as diagnosed by a leak from cam seal and dancing oil fill cap. Replaced seal, still appears to leak. Oil puddling on water pump and seeping thru new oil cap gasket. Replaced seemingly clear metal flame trap with plastic. All hoses are clear and intact. Dug out old breather box, which had been cleaned 5 years ago. Replaced with new unit. Everything back together. Oil cap still dancing. Too early to tell if cam seal still leaks, but I'll bet it does.
What else may be the cause of high oil pressure? No, I have not measured the pressure
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89 240 wagon, 94 940, 215K, 94 940, 141K
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