TROUBLESHOOTING
14-4
1.3 Knocking
The diesel engine rotates producing unique combustion
noise (diesel knock) due to its combustion system. This
knock noise is normal unless it is especially loud.
1.3.1 Check items before troubleshooting
(1) Clogging of air cleaner element
(2) Use of poor quality fuel (low cetane number fuel such
as kerosene)
1.3.2 Problem: Knocking
Problem: Knocking
NO
NO
NO
YES
YES
YES
YES
Adjust fuel injection timing
Examine fuel injection nozzles
Is the compression pressure
in cylinders normal?
Is the fuel injection timing normal
(fuel injection timing is early)?
Are fuel injection nozzles normal (drop in
injection-valve opening pressure and faulty)
Inspecting valves, pistons, piston rings
and cylinder head gasket
Is the fuel injection pump normal (variations in injection amount)?
Generation of mechanical noise (wear of and damage to main working parts)
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