12-124 95-2 SERIES
TROUBLESHOOTING S-16
S-16 Vibration is excessive
fl If there is abnormal noise together with the
vibration, carry out troubleshooting for “Ab-
normal noise is made”.
General causes why vibration is excessive
• Defective parts (abnormal wear, breakage)
• Improper alignment
• Abnormal combustion
Confirm recent repair history
Degree of use of machine
Condition of vibration
Non-specified oil is being used
Metal particles are found in oil filter
Metal particles are found when oil is drained
Oil pressure is low at low idling
Vibration occurs at mid-range speed
Vibration follows engine speed
Exhaust smoke is black
Seal on fuel injection pump has come off
Worn connecting rod, main bearing
Worn cam bushing
Worn support pilot
Loose engine mounting bolts, broken cushion
Broken part inside output shaft (damper)
Misalignment between engine and power train
Improper gear train backlash
Defective dynamic valve system (valve, rocker lever, etc.)
Defective fuel injection pump (excessive fuel injection)
QuestionsCheck items
Remove oil pan and inspect directly
Remove side cover and inspect directly
Check directly for worn support pilot, play
Inspect directly for loose engine mounting bolts, broken cushion
Inspect inside of output shaft (damper) directly
When radial runout, face runout are measured, they are
found to be outside standard value
Remove front cover and inspect directly
Remove head cover and inspect directly
Fuel injection pump test shows that fuel injection amount is incorrect
Troubleshooting
Remedy
Replace
Replace
Replace
Replace
Replace
Correct
Correct
Replace
Adjust
Causes
Operated for long period
Suddenly increased
Gradually increased
Legend
: Possible causes (judging from Questions and check items)
: Most probable causes (judging from Questions and Check items)
: Possible causes due to length of use (used for a long period)
: Items to confirm the cause.
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