THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/01/2008
4 - 35
Table 4-1: Engine Trouble Shooting Chart, Page 10 of 13
TROUBLE PROBABLE
CAUSE
REMEDY
Oil loss through
engine breather
(continued)
Hole burned in piston
Replace cylinder and
piston assembly. Check for
further damage.
Engine smoking
excessively)
Clogged rocker box interconnects
Excessively worn valve guide
Check interconnects of
smoking cylinder and
remove sludge from
interconnects
Remove exhaust stack and
check for oil seepage
around exhaust valve
stem. If seepage is
present, replace cylinder.
Engine continues
operating during
ignition switch check
Left or Right or Both magnetos may
not be grounded properly
Check continuity of "P"
lead
Excessive oil
draining from
exhaust stacks after
shutdown
Exhaust valve in the open position
Improper engine shutdown (Improper
oil scavenge)
Normal condition
Adhere to proper engine
shutdown procedure
Excessive oil
consumption
(greater than 2
GPH)
External oil leak
Internal oil leak
Incorrect installation of piston rings
Worn or broken piston rings
burned pistons
Worn impeller oil seal
Worn valve guides
Repair leak
Replace engine
Refer to Engine
Manufacturer's Manual
Replace
Replace engine
Replace engine
Replace cylinder
