Piper Warrior III - Page 845

PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 5
Nov 30/06
4J3
71-00-00
CHART 1 (Sheet 4 of 5)
TROUBLESHOOTING ENGINE
Trouble Cause Remedy
High oil temperature. Insufficient air cooling. Check air inlet and outlet
for deformation or
obstruction.
Insufficient oil supply. Fill oil sump to proper level.
Clogged oil lines or screens. Remove and clean oil
screens.
Failing or failed bearing. Examine sump for metal
particles and, if found,
overhaul engine.
Defective thermostats. Replace.
Defective oil temperature gauge. Replace gauge.
Excessive blow-by. Usually caused by weak or
stuck rings. Top overhaul
engine.
Improper engine operation. Check entire engine.
Excessive oil consumption. Leakage through engine fuel Replace fuel pump O-ring.
pump vent.
Engine breather or vacuum Check engine compression.
pump breather (blowing oil). If too low, top overhaul
engine. Check engine and
vacuum pump breather for
excessive leakage or
pressure. Overhaul or
replace vacuum pump.
Engine breather or vacuum Check engine and vacuum
pump breather (leaking oil). pump breather fittings,
couplings and breather
pipe for position.
Failing or failed bearing. Check sump for metal
particles and, if found,
completely overhaul
engine.
Worn or broken piston rings. Install new piston rings.
Incorrect installation of piston rings. Install new piston rings.
External oil leakage. Check engine carefully for
leaking gaskets, O-rings or
sand holes.