Page 12 - AN-PARTS KATALOG

Fault Diagnosis

Fehlerdiagnose / Dépistage des pannes

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Enlarged probe tip
Cause
• Excessive voltage (e.g. 12-V Glow Plug in a 24-V system or vice versa)
• Failure of alternator and regulator
• Dampness during storage
Solution
• Check on-board and Glow Plug voltage
• Check charging system
• Check quality of storage conditions

Damaged or missing probe tip

Cause
• Failure of ignition unit
• Direction or regularity of fuel jet incorrect
• Sealing fault causing spraying position error
Solution
• Check the ignition unit is correctly installed
• Check you are using the correct ignition unit for the vehicle model
• Check the Glow Plug installation point for carbon deposits

Deformed probe (overheating)

Cause
• Failure of ignition unit
• Direction or regularity of fuel jet incorrect
• Wrong spraying position caused by faulty sealing
• Excessive glowing / voltage (e.g. 24-V Glow
• Plug in a 12-V system or vice versa)
• Failure of alternator and regulator
• Function or timing fault in injection unit
Solution
• Check the ignition unit is correctly installed
• Check you are using the correct ignition unit for the vehicle model
• Check the Glow Plug installation point for carbon deposits
• Check contacts on Glow Plug regulator
• Check on-board and Glow Plug voltage
• Check charging system voltage
• Check fuel injection timing

Probe touching body of
Glow Plug
Cause
• Over-tightened torque
• Wrong tool used
• Thread damage to opening of cylinder head
Solution
• Check the opening of cylinder head for thread damage / carbon fouling
• Check Glow Plug torque
Carbon deposits between probe
and body of Glow Plug

Cause
• Failure of ignition unit
• Direction or regularity of fuel jet incorrect
• Wrong spraying position caused by faulty sealing
• Injection pump operation / timing failure
Solution
• Check you are using the correct ignition unit for the vehicle model
• Check the ignition unit is correctly installed
• Check the Glow Plug installation point for carbon deposits
• Check the opening of cylinder head for thread damage / carbon fouling
• Check timing of injection pump

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