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Abnormal Operating Condition Symptoms and Probable Causes
Worn/broken oil control rings
X
—
Scored liner and/or piston
X
—
Excessive engine installation angle
X
—
Crankcase overfilled
X
—
Oil in air tanks (air compressor malfunction)
X
—
Plugged crankcase breather
X
—
Oil level low
—
X
Improper engine oil viscosity (fuel in the oil)
—
X
Faulty oil pressure regulator valve
—
X
Worn crankshaft, camshaft or connecting rod
bearings
—
X
Faulty oil pressure relief valve
—
X
Air leaks in oil pump (suction side)
—
X
Worn or damaged oil pump
—
X
Faulty oil pressure gauge
—
X
Faulty electrical components (for gauge)
—
X
Plugged oil line or orifice
—
X
* Indicates high crankcase pressure
Troubleshooting
106
All information subject to change without notice.
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