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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
TROUBLESHOOTING OVERHAUL INSTRUCTIONS
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6.2.2 Problem 2: Fuel knock
More or less fuel knock occurs in diesel engines. This
may be caused either by an excessively large delay
period or by a too fast rate of fuel injection.
1. Items to be checked ahead of time
• Clogged air cleaner
• Poor quality fuel
2. Inspection procedure
Is injection timing correct (not too advanced)? No Z
Make adjustment to the
timing.
VYes
Is solenoid switch normal? No Z Check the switch.
V Yes
Is injection pressure (injection nozzle valve opening pressure) correct (not
too low)?
No Z
Make adjustment to the
pressure.
V Yes
Is compression pressure correct? No Z
Check valves, piston rings,
and cylinder head gasket.
V Yes
Fuel injection pump is faulty.
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