OL1276 03/10
21
If you cannot correct problems with these procedures, see your
Lugger or Northern Lights
dealer.
Excessive Fuel Consumption
(continued)
Engine overloaded :
• Reduce load on engine.
Compression too low:
• Determine cause of low compression and
repair.
Leaks in fuel supply:
• Locate source of leak and repair as required.
D
Abnormal Engine Noise
Worn main or connecting rod bearings:
• Determine bearing clearance. See your dealer.
Excessive crankshaft end play:
• Check crankshaft end play. See your dealer.
Loose main bearing caps:
• Check bearing clearance, replace bearings and
bearing cap screws as needed. See your
dealer.
Worn connecting rod bushings and piston pins:
• Inspect piston pins and bushings. See your
dealer.
Scored
pistons:
• Inspect pistons. See your dealer.
Worn timing gears or excessive back lash:
• Check timing gear back lash. See your dealer.
Excessive valve clearance:
• Check and adjust valve clearance. See your
dealer.
Worn camshaft lobes:
• Inspect camshaft. See your dealer.
Worn rocker arm shafts:
• Inspect rocker arm shafts. See your dealer.
D
Engine Emits Black or Gray Exhaust Smoke
Clogged or dirty air cleaner:
• Service air cleaner.
Defective
muf
fl
er (back pressure too high):
• Have dealer check back pressure.
Improper
fuel:
• Use correct fuel for temperature.
Electronic Control System problem:
• See your dealer.
D
Engine Emits White Smoke
Engine compression too low:
• Determine cause, see dealer.
Defective thermostat (does not close):
• Remove and check thermostats, replace if
needed.
Coolant entering combustion chamber, maybe a
failed cylinder head gasket or cracked cylinder head:
• Repair, see your dealer.
Troubleshooting
D
Engine Emits White Smoke
Water-to-air aftercooler fails:
• Remove and inspect water-to-air aftercooler.
See
your
dealer.
D
Engine Idles Poorly
Improper type of fuel:
• Replace with correct fuel grade.
Air leak on suction side of air intake:
• Check hose and pipe connections for tightness,
repair
as
required.
Electronic control system problem:
• See your dealer.