Thrush Aircraft S2R-R1340 Maintenance Manual page 103

Table 4-1: Engine Trouble Shooting Chart, Page 8 of 13
TROUBLE
No oil pressure
Low oil pressure
Effective: 01/01/2008
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Faulty transmitter or gage
Inadequate oil supply
Plugged oil-in line
Relief valve stuck open
Internal oil leak
Sheared oil pump drive gear shaft
Air lock in pressure pump
Master rod bearing malfunction
Defective transmitter or gage
Inadequate oil supply
High oil temperature
Oil screen clogged
Improper setting of pressure relief
valve
Stuck pressure relief valve
Defective relief valve spring
Obstruction in oil-in line
Internal oil leak
Oil foaming
Internally scored oil pump
Worn bushings or bearings
REMEDY
Replace malfunctioning
unit
Replenish oil supply
Remove and wash, or
replace oil in-line if
necessary
Repair and reset
Replace engine
Replace pump
Remove air by bleeding
Replace engine
Replace defective unit
Replenish oil supply
Inspect oil cooler control
Remove & clean oil screen
Reset relief valve
Remove, polish and replace
valve
Replace spring
Inspect and remove
obstruction
Replace engine
Drain, flush and replenish
oil supply. Check for
proper grade of oil used.
Replace oil pump
Replace engine
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