Owner’s Manual for Indirect Fired Heater
25
Troubleshooting
Problem
Cause
Solution
Fuel in oil
Restricted fuel return line.
Check and fix fuel return lines.
Engine load too light.
Increase engine load.
Leaking fuel injectors.
Contact a GMP ASD.
Low-pressure fuel system
— fuel pressure low
Restricted fuel filter.
Replace fuel filter.
Restricted fuel line.
Locate restriction, repair as required.
Faulty transfer pump.
Contact a GMP ASD.
Faulty high-pressure fuel pump.
Remove fuel pump, repair/replace
pump as required.
Abnormal engine noise
Worn main or connecting rod bearings.
Contact a GMP ASD.
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.
Engine emits white smoke
Insufficient engine compression.
Determine cause of low compression
and repair as required, or contact a
GMP ASD.
Faulty thermostat(s) (does not close).
Test thermostats; replace thermostats
as required.
Coolant entering combustion chamber
(failed cylinder head gasket or cracked cyl-
inder head).
Repair or replace as required, or con-
tact a GMP ASD.
Electronic control system problem or basic
engine problem.
Contact a GMP ASD.
Poor fuel quality or incorrect type of fuel.
Drain fuel and replace with proper
grade and quality of fuel for operating
condition.
Low engine temperature.
Warm up engine to normal operating
temperature.
Faulty fuel injectors.
Contact a GMP ASD.
Summary of Contents for MAC1.2G
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