A.Use of heavy engine oil
B.Use of dilute engine oil
C.Air leaks in oil pump suction line
D.Excessive clearances at valve pushers
E.Water, sludge, dirt etc. restricting pump intake screen
A.Use of heavy engine oil
B.Use of dilute engine oil
C.Air leaks in oil pump suction line
D.Excessive clearances at valve pushers
E.Water, sludge, dirt etc. restricting pump intake screen