Knocking - Mitsubishi L3E Service Manual

GENERAL
Yes
Do injection nozzles operate properly?
(Check for lowering of injection start pressure and improper shape of fuel
Yes
Is cylinder compression proper?
Yes
Does injection pump operate properly?
(Check for uniformity of injection quantity.)
Yes
Mechanical noise
(Worn or damaged main
moving parts)
Service Manual Mitsubishi L-Series diesel engines
Version 08/2004
Is injection timing correct?
spray.)
6.3

Knocking

Diesel engines are usually accompanied by fuel
combustion noise (diesel knocking sounds) because of
its inherent mechanism.
A trouble should be suspected only when the engine
makes abnormally large sounds.
6.3.1 Matters to be checked before
diagnosis
1. Clogging of the air cleaner
2. Use of poor-quality fuel (Low cetane number fuel
such as used for burner)
6.3.2 Diagnosis
ENGLISH
TROUBLESHOOTING
No Adjust injection timing.
No Inspect injection nozzles.
Inspect valves, pistons, piston
No rings and cylinder head
gasket.
33 / 155