Thrush Aircraft S2R-R1340 Maintenance Manual page 100

Table 4-1: Engine Trouble Shooting Chart, Page 5 of 13
TROUBLE
Inoperative
cylinder
Engine tends to run
lean
Engine tends to run
rich
4-30
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Fouled spark plugs
Faulty wires in ignition cable manifold
Intake valve not opening
Broken rocker arm
Incorrect idle mixture adjustment
Defective carburetor
Defective vapor vent valve
Automatic mixture control sticking
Manual mixture control linkage out of
adjustment
Defective fuel pump
Clogged fuel line or carburetor strainer
Low fuel pressure
Oil in carburetor air passages
Incorrect idle mixture adjustment
Defective carburetor
Automatic mixture control sticking
Primer leaking
High fuel pressure
REMEDY
Replace spark plugs
Replace harness
Check valve clearance
Replace rocker arm
Readjust idle mixture
Replace carburetor
Replace outer vapor vent
valve.
Replace automatic mixture
control unit
Readjust linkage
Replace fuel pump
Wash and replace strainer
Adjust or replace fuel
pump
Replace carburetor
Readjust idle mixture
Replace carburetor
Replace automatic mixture
control unit
Replace primer
Adjust relief valve at pump
Effective: 01/01/2008