THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/01/2008
4 - 37
Table 4-1: Engine Trouble Shooting Chart, Page 12 of 13
TROUBLE PROBABLE
CAUSE
REMEDY
Improper valve
clearance
Stretched valve stem
Defective bushing in rocker arm
Defective tappet roller bushing
Valve collapsed
Replace cylinder
Replace rocker arm
Replace tappet assembly
Replace cylinder
Damaged intake
push rod.
Broken exhaust rocker arm in same
cylinder causing excessive pressures.
Replace cylinder
Both push rods
bent on same
cylinder
Broken connecting rod, allowing piston
to hang up in combustion chamber
Replace engine
Detonation
Loose spark plugs
Spark too far advanced
Preignition
Wrong grade of fuel
Incorrect fuel-air ratio
High carburetor air temperatures
Excessive manifold pressure
Tighten spark plugs
Retime magneto
Reset magneto timing
Drain tanks, service with
correct grade
Adjust fuel-air ratio
Inspect alternate air system
Reduce throttle setting
Faulty magneto
Incorrect timing
Breaker points worn or burned
Points not properly tightened when
installed
Distributor finger loose on shaft
Replacement points not properly
adjusted
Magneto attaching nuts too tight
Time magneto
Replace breaker points
Adjust breaker points
Replace magneto
Reset magneto points
Tighten nuts and retime
magneto
