Thrush Aircraft S2R-R1340 Maintenance Manual page 99

Table 4-1: Engine Trouble Shooting Chart, Page 4 of 13
TROUBLE
Engine runs
rough
(continued)
Effective: 01/01/2008
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Carburetor icing
Primer leaking
Incorrect idle mixture adjustment
Water in fuel
Low compression
Bent or broken connecting rod
Sticking valves or valve tappets
Improper valve clearance
Broken valve spring
Malfunction of internal part
Worn thrust bearing
Loose thrust nut
Loose exhaust collector ring
Bent drive shaft
Worn engine mounts
Trapped air carburetor
REMEDY
Preheat or deice, depending
upon climatic condition.
Replace carburetor if
necessary.
Replace primer
Adjust idle mixture
Drain fuel tank until water
is removed. Refill tank
with grade of fuel
conforming to correct
specifications.
Replace cylinder
Replace engine
Replace cylinder or valve
tappets
Adjust valves
Replace cylinder
Replace engine
Replace engine
Tighten nut
Tighten loose nuts
Replace engine
Replace engine mounts
Bleed air from carburetor
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