Cessna 150K - Page 145

11-9. TROUBLE SHOOTING (Cont).
TROUBLE PROBABLE CAUSE
REMEDY
LOW OIL PRESSURE. Low oil supply.
Replenish.
Oil viscosity too low.
Drain and refill with correct
seasonal grade.
Refer to
Section 2.
Sludge or foreign material in
Remove and clean valve parts.
relief valve.
Foam in oil due to emulsification Drain and refill with fre sh oil.
of alkaline solids.
Refer to Section 2 for seasonal
grade.
Defective pressure gage.
Check with known good gage.
Replace defective gage.
Oil pump defective.
Remove and inspect. Examine
engine.
Metal particles from
damaged pump may have entered
engine oil passages.
Oil congealed in gage line.
Disconnect line at engine and gage;
flush with kerosene.
Pre- fill line
with kerosene and install.
Oil pressure line broken, dis-
Inspect, replace or connect
connected or pinched.
line.
Internal leak, burned bearings,
Major overhaul.
or damaged gasket.
OIL LEAK AT FRONT OF
Damaged crankshaft seal.
Replace.
ENGINE.
OIL
LEAK AT PUSH ROD
Damaged push rod housing oil seal.
Replace.
HOUSING.
LOW COMPRESSION.
Cylinder wall worn out-of-round
Replace cylinder and rings.
and choke reduced.
Intake valves guides worn.
Top overhaul.
Valves seats and faces worn.
Top overhaul.
Piston rings excessively worn.
Top overhaul.
Valves sticking in guides.
Top overhaul.
11-7