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Troubleshooting
TROUBLE
Oil Leaks
Low Compression
Engine Will Not Stop At
Idle Cutoff
Climbing to Altitude,
Fuel Flow Fluctuates
Low Fuel Pressure
High Fuel Pressure
Fluctuating Fuel
Pressure
Engine Has
Poor Acceleration
4-6
ENGINE TROUBLESHOOTING
PROBABLE CAUSE
At front of engine, damaged
crankshaft oil seal
Around plugs, fittings and gaskets
due to looseness or damage
Piston rings excessively worn
Valve faces and seats worn
Excessively worn cylinder walls
Fuel manifold valve not seating
properly
Fuel Vaporization
Incorrect fuel pump adjustment
Malfunctioning fuel pump relief
valve
Malfunctioning relief valve
operation in fuel pump
Restricted recirculation passage in
fuel pump
Incorrect fuel pump adjustment
Fuel gauge line leak or air in gauge
line
Vapor in fuel system, excessive fuel
temperature
Idle mixture too lean
(continued)
CORRECTION
Replace crankshaft oil seal
Torque or replace
Inspect, repair or replace cylinder.
Replace piston rings
Inspect, repair or replace cylinder.
Replace any worn parts
Replace cylinder & piston rings
Repair or replace fuel manifold
valve
Operate
fuel
accordance
with
manufacturer's
Manual (AFM)
Check and adjust in accordance
with section 2, chapter 18, "Fuel
System Adjustment
Replace fuel pump
Replace fuel pump
Replace fuel pump
Check and adjust in accordance
with section 2, chapter 18, "Fuel
System Adjustment
Drain gauge line and torque
connections in accordance with the
airframe manufacturer's instructions
Normally, operating the auxiliary
pump will clear system. Operate
boost pump in accordance with the
airframe manufacturer's Airplane
Flight Manual (AFM)
(Check RPM Rise, Idle Cutoff).,
Adjust idle mixture in accordance
with section 2, chapter 18, "Fuel
System Adjustment ."
boost
pump
in
the
airframe
Airplane
Flight
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