Thrush Aircraft S2R-R1340 Maintenance Manual page 97

Table 4-1: Engine Trouble Shooting Chart, Page 2 of 13
TROUBLE
Engine will not
continue running
after starting.
(continued)
Improper idling
of engine
Effective: 01/01/2008
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Blown or leaking gaskets
Vapor lock
Defective fuel pump
Fuel strainer clogged
Obstruction in carburetor air scoop
Malfunctioning carburetor
Water in fuel
Faulty or loose spark plugs
Defective spark plug contacts
Cold engine
Magneto timing off
Incorrect idle mixture adjustment
Leaking primer
Leak in induction system
Vapor vent valves leaking in carburetor
REMEDY
Replace gaskets
Remove vapor vent pipe
plug from top of fuel control
unit in carburetor. Turn on
booster pump and rotate
propeller shaft until fuel runs
freely from vent.
Replace only with a similar
pump
Wash and replace fuel
strainer
Inspect and remove
obstruction
Replace carburetor
Drain fuel tank until
presence of water is
negative. Replenish with
fuel specified for engine.
Replace spark plugs
Replace spark plug lead
Warm engine to normal
operative temperature
before allowing to idle
Reset magneto
Adjust idle mixture
Check primer solenoid
valve for leakage. Replace
primer
Check visually and repair
as necessary
Replace outer vent valve.
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