Mitsubishi S4L User Manual

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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
TROUBLESHOOTING
ENGLISH
OVERHAUL INSTRUCTIONS
6.3 Starting system
troubleshooting
Overruns at low speed → Make reference to “Overrun.”
Faulty starter
motor
Burned contact points in switch
Layer shorted or grounded field coil
Layer shorted or grounded armature coil
Mechanical problems Misaligned armature
Machining fault of parts
Worn bearings
Burned motor coil or switch coil
Burned field coil
Burned coil in armature
Burned motor coil (evidence of rubbing)
Pinion gap too large.
Switch will not turn off only when engine fails to
fire, resulting in damage to motor.
Hard starting at low
temperatures
Wrong starting system
High resistance in main circuit
Poor quality fuel
Troubles in engine
No fuel
Mechanical problems in engine
Very low ambient temperature
Engine directly coupled to load
Reverse torque due to incorrect injection timing
Mechanical problems in engine
Starter abused (for moving equipment)
Burned motor coil
Prolonged
cranking
Excessive
load
Burned starter
Pinion fails to
shift
Battery run-down
Pinion butts
ring gear
instead of
meshing
No cranking
Loose battery terminals
Defective key switch
Poor S connector contact
S connector missing
Open circuit in engine switch coil
Worn starter brushes
Defective contact points in auxiliary switch
Open circuit in auxiliary switch coil
High resistance in S circuit
Voltage applied to starter too high
Contact points defective in starter switch
Pinion and ring gear improperly chamfered
Pinion shifts
but will not
spin
Battery rating too high
Pinion chamfered insufficiently or wrong
Ring gear chamfered insufficiently or wrong
Ring gear end face badly worn (ring gear not hardened properly)
Pinion will not shift
Pinion tooth worn round
Overrunning clutch jammed with
foreign matter
Shift lever jammed
Solenoid switch plunger jammed
Shift lever broken
Shift lever brokenContact points close to early
Pinion gap too large
Pinion shifted excessively
Pinion is forced into mesh with ring gear again when starter is
coasting
Pinion chamfered insufficiently or wrong
Ring gear locally chipped
Four or five teeth chipped
Overrunning clutch shell peeled
Pinion is chipped
Pinion metal jammed with dirt

Mitsubishi S4L Specifications

General

Brand	Mitsubishi
Model	S4L
Category	Engine
Language	English