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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
TROUBLESHOOTING OVERHAUL INSTRUCTIONS
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6.2.4 Problem 4: Black exhaust smoke
1. Items to be checked ahead of time
• Clogged air cleaner
• Poor quality fuel
2. Inspection procedure
Are valve clearance and injection timing correct? No Z
Make adjustment to the
clearance and timing.
VYes
Is injection nozzle discharge pattern normal? Is injection pressure correct
(not too high)?
No Z
Make adjustment to the
nozzles.
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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