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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
TROUBLESHOOTING
ENGLISH
OVERHAUL INSTRUCTIONS
6.2 Engine troubleshooting
6.2.1 Problem 1: Hard starting
1. Items to be checked ahead of time
• Clogged air cleaner
• Wrong oil grade for weather conditions
• Poor quality fuel
• Low cranking speed
2. Inspection procedure
Is heating system normal? No Z
Glow plugs are energized
shortly after starter switch is
turned to ON.
No Z Check control timer unit.
VYes
Are fuel lines free of restriction? (Is fuel pump operating properly when
starter switch in ON position?)
No Z
Check fuel filter, fuel lines
and fuel tank.
V Yes
Are fuel injection timing and valve clearance correct? No Z
Make adjustment to the
timing and clearance.
V Yes
Is fuel 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 gasket.
V Yes
Fuel injection pump is faulty.
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