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Fault Finding
CHART A7—Engine excessive noise
Cause
Remedy
Drive belt squeal, insufficient tension or
abnormally high loading.
Check the tensioner and inspect the drive belt for deterioration.
Make sure the water pump, tensioner pulley, fan and alternator turn
freely.
Check for paint/oil or other materials on the pulleys.
Check the tension of the accessory drive belts.
Air intake or exhaust leaks.
Refer to Charts A13 & A14.
Fuel is contaminated or incorrect grade of
diesel used.
Refer to Fluids & Lubricants section for recommended diesel
fuels. If the fuel is suspect, verify by operating the engine with
clean fuel from a temporary tank.
Inlet and exhaust valve clearances set
incorrectly.
Set the valve clearances to the recommended clearances.
Inlet and exhaust valve springs broken. Check and fit new valve springs.
Worn crank/connecting rod bearings
(knocking under load).
Check/replace rod and main bearings.
Excessive camshaft bearing wear. Check bearings (engine overhaul required).
Worn or damaged pistons and or piston
rings.
Check piston assemblies (engine overhaul required).
One or more injector worn or
malfunctioning.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
Gear train noise. Visually inspect and measure gear backlash. Replace gears as
required.
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