Page 14 - AN-PARTS KATALOG

Fault Diagnosis

Fehlerdiagnose / Dépistage des pannes

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Broken probe tip
Cause
• Excessive glowing / voltage (e.g. 24-V Glow Plug in a 12-V system or vice versa)
• Failure of alternator and regulator
Solution
• Check contacts on Glow Plug regulator
• Check on-board and Glow Plug voltage

Missing probe

Cause
• Ignition unit failure
• Direction or regularity of fuel jet incorrect
• Wrong spraying position caused by faulty sealing
• Function or timing fault in injection unit
• Thread damage to opening of cylinder head where Glow Plug is installed
• Glow Plug insufficiently tightened causing plug to sit incorrectly
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 timing of injection pump
• Check the opening of cylinder head

Swollen ring on the probe tip

Cause
• Oil in the combustion chamber, probably caused by engine wear
Solution
• Check piston clearance in engine cylinders
• Check oil consumption

Broken / Bent power terminal

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

Holes in probe / cracks / melting next to body of Glow Plug

Cause
• Failure of ignition unit
• Direction or regularity of fuel jet incorrect
• Wrong spraying position caused by faulty sealing
• Function or timing fault in injection unit
• Thread damage to opening of cylinder head where Glow Plug is installed
• Glow Plug insufficiently tightened causing plug to sit incorrectly
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