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Glow plugs ... what can be wrong with them?


 
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PostPosted: Mon Dec 01, 2008 16:08    Post subject: Glow plugs ... what can be wrong with them? Reply with quote

Glow Plug Fault Diagnosis

There are many ways to diagnose engine faults.   Wink

For those with starting problems, or smoke issues, these images may help workout what some of your problems are caused by, based on damage seen on removed Glow Plug probe tips.


Problem: Enlarged probe tip

 

Possible cause: / Solution:
  • Excessive voltage (12v plug in 24V system or vice versa)
     Check:- On-board & Glow Plug voltage
  • Failure of alternator or regulator
     Check:- Charging system
  • Stored in damp condition prior to use
     Check:- Storage conditions

Problem: Broken probe tip

 

Possible cause: / Solution:
  • Excessive glowing / voltage (12v plug in 24V system or vice versa)
     Check:- On-board & Glow Plug voltage
  • Failure of alternator or regulator.
     Check:- Contacts on regulator

Problem: Damaged or missing probe tip

 

Possible cause: / Solution:
  • Failure of ignition unit
     Check:- Ignition unit is correctly installed
  • Direction or regularity of fuel jet incorrect
     Check:- That the correct ignition unit is installed
  • Sealing fault causing spraying position error
     Check:- GlowPlug installation point for carbon deposits

Problem: Deformed probe (overheating)

 

Possible cause: / Solution:
  • Failure of ignition unit
     Check:- Ignition unit is correctly installed
  • Direction or regularity of fuel jet incorrect
     Check:- That the correct ignition unit is installed
  • Wrong spraying position due to faulty sealing
     Check:- GlowPlug installation point for carbon deposits
  • Excessive glowing / voltage (12v plug in 24V system or vice versa)
     Check:- Contacts on Glow Plug regulator and Glow Plug voltage
  • Failure of alternator or regulator.
     Check:- Contacts on regulator
  • Function or timing fault in injection unit
     Check:- Fuel injection timing

Problem: Swollen ring on probe tip

 

Possible cause: / Solution:
  • Oil in combustion chamber, probably due to engine wear
     Check:- Piston clearance in cylinders and oil consumption

Problem: Missing probe

 

Possible cause: / Solution:
  • Failure of ignition unit
     Check:- Ignition unit is correctly installed
  • Direction or regularity of fuel jet incorrect
     Check:- That the correct ignition unit is installed
  • Wrong spraying position due to faulty sealing
     Check:- GlowPlug installation point for carbon deposits
  • Function or timing fault in injection unit
     Check:- Fuel injection timing
  • Thread damage to opening of cylinder head, where Glow Plug is installed
     Check:- The opening of cylinder head for thread damage / carbon fouling
  • Glow Plug insufficiently tightened allowing plug to sit incorrectly
     Check:- Glow Plug Torque

Problem: Probe touching body of Glow Plug

 

Possible cause: /  Solution:
  • Over-tightened Glow Plug - bent on installation
     Check:- Glow Plug torque
  • Thread damage to opening of cylinder head, where Glow Plug is installed
     Check:- The opening of cylinder head for thread damage / carbon fouling

Problem: Holes in probe - cracks - probe melted next to body of Glow Plug

 

Possible cause: / Solution:
  • Failure of ignition unit
     Check:- Ignition unit is correctly installed
  • Direction or regularity of fuel jet incorrect
     Check:- That the correct ignition unit is installed
  • Wrong spraying position due to faulty sealing
     Check:- GlowPlug installation point for carbon deposits
  • Function or timing fault in injection unit
     Check:- Fuel injection timing
  • Thread damage to opening of cylinder head, where Glow Plug is installed
     Check:- The opening of cylinder head for thread damage / carbon fouling
  • Glow Plug insufficiently tightened allowing plug to sit incorrectly
     Check:- Glow Plug Torque

HTH?

Simon Cool
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PostPosted: Mon Dec 01, 2008 16:08    Post subject: Google Ads keep the POCUK free to join!


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