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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
TROUBLESHOOTING OVERHAUL INSTRUCTIONS
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6.2.6 Problem 6: Low power or loss of
power
1. Items to be checked ahead of time
• Stuck running parts
• Wrong oil grade for weather conditions
• Poor quality fuel
• Clogged air cleaner
• Restricted exhaust line
• Faulty power take-off
2. Inspection procedure
Are valve clearance and injection timing correct? No Z
Make adjustment to the
clearance and timing.
VYes
Are fuel lines free from restriction? (Is fuel pump operating properly when
starter switch is in ON position?)
No Z
Check fuel tank, fuel filter
and fuel lines.
V Yes
Is governor adjustment correct? No Z
Make adjustment to the
governor.
V Yes
Is injection nozzle discharge pattern normal?
Is injection pressure correct?
No Z
Make adjustment to the
nozzles.
V Yes
Is compression pressure correct? No Z
Check valves, piston rings
and cylinder head gaskets.
V Yes
Fuel injection pump is faulty.
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