Thrush Aircraft S2R-R1340 Maintenance Manual page 104

Table 4-1: Engine Trouble Shooting Chart, Page 9 of 13
TROUBLE
High oil pressure
Oil accumulation in
crankcase
Oil loss through
engine breather
4-34
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Defective transmitter or gage
Cold oil
Pressure relief valve improperly set
Pressure relief valve stuck or shut by
liquid lock
Air lock in scavenge system
High oil temperature
Congealed oil in oil cooler
Excessive oil in tank
Plugged scavenge screens
Defective scavenge pump
Wrong grade of oil
Oil inlet check valve remaining open
Internal leaks
Oil accumulation in crankcase
Oil-tank-to-engine vent passage
restriction.
Defective scavenge pump
Plugged scavenge screens
Piston-cylinder "blow-by"
REMEDY
Replace defective unit
Preheat oil
Reset relief valve
Replace relief valve
Disconnect oil line close to
oil pump and bleed
Inspect oil cooler
temperature control
Apply heat to oil cooler
Drain excess oil
Remove, wash and replace
screens.
Replace pump
Drain and service with
correct grade of oil
Replace check valve
Replace engine
Inspect oil inlet check
valve and scavenge pump
Remove restriction
Replace pump
Remove and wash screens.
Make sure screens are
thoroughly dried before
reinstalling.
Replace cylinder and
piston assembly
Effective: 01/01/2008