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Fault Finding
CHART A8—Engine compression knocks
Cause
Remedy
Fuel is aerated. Check the fuel system for loose connections and possible air
ingress points. Rectify and bleed the fuel system.
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.
Injection pump timing incorrect. If the pump has recently been removed and replaced the timing
could be incorrect if the correct removal procedures were not
followed.
The timing can only be checked by a FIE specialist using the
correct equipment.
Inlet and exhaust valve springs broken. Check and fit new valve springs.
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.
Coolant operating temperature incorrect. Refer to Charts D2 & D3.
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