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Problem
Fuel in oil
Low-pressure fuel system
— fuel pressure low
Abnormal engine noise
Engine emits white smoke
Owner's Manual for Indirect Fired Heater
Cause
Restricted fuel return line.
Engine load too light.
Leaking fuel injectors.
Restricted fuel filter.
Restricted fuel line.
Faulty transfer pump.
Faulty high-pressure fuel pump.
Worn main or connecting rod bearings.
Excessive crankshaft end play.
Loose main bearing caps.
Worn connecting rod bushings and piston
pins.
Scored pistons.
Worn timing gears or excess backlash.
Excessive valve clearance.
Worn camshaft lobes.
Worn rocker arm shaft(s).
Worn valve guides.
Damaged valve retainers.
Loose or worn rocker arms.
Bent pushrods.
Broken valve springs.
Bent connecting rods.
Worn flywheel.
Loose flywheel.
Excessive piston to liner clearance.
Excessive thrust bearing clearance.
High oil viscosity.
Insufficient engine compression.
Faulty thermostat(s) (does not close).
Coolant entering combustion chamber
(failed cylinder head gasket or cracked cyl-
inder head).
Electronic control system problem or basic
engine problem.
Poor fuel quality or incorrect type of fuel.
Low engine temperature.
Faulty fuel injectors.
Solution
Check and fix fuel return lines.
Increase engine load.
Contact a GMASD.
Replace fuel filter.
Locate restriction, repair as required.
Contact a GMASD.
Remove fuel pump, repair/replace
pump as required.
Contact a GMASD.
Determine cause of low compression
and repair as required, or contact a
GMASD.
Test thermostats; replace thermostats
as required.
Repair or replace as required, or con-
tact a GMASD.
Contact a GMASD.
Drain fuel and replace with proper
grade and quality of fuel for operating
condition.
Warm up engine to normal operating
temperature.
Contact a GMASD.
Troubleshooting
27
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