Defects - Ceramic glow plugs

The appearance of a glow plug can provide clues as to possible causes of damage. Here you can see the most important defects and learn what they tell you.

Overvoltage damage to ceramic glow plugs arises when the wrong glow plug (12V instead of 24V) was installed.
Glow plugs which were subjected to overvoltage look like this

 

Overvoltage damages/Broken heating coil

Overvoltage damage arises when the wrong glow plug (12 V instead of
24 V) was installed.  It is also possible that the control unit generates too much voltage or the current flow is switched off too late. The control unit and alternator should be inspected.

A break as a result of overheating indicates that the spray pattern of the fuel quantity is not correct, if the point of injection time is not correct.
Severe overheating can also break glow plugs

Overheating damage/break

A break as a result of overheating indicates that the spray pattern of the fuel quantity is not correct, if the point of injection time is not correct. Non-tight pistons and valves can also be a cause for this, insofar as oil penetrates into the combustion chamber.

Non-tight pistons and valves can also be a cause for overheating damage, insofar as oil penetrates into the combustion chamber.
Severe overheating can also break glow plugs

Non-tight pistons and valves can also be a cause for overheating damage, insofar as oil penetrates into the combustion chamber.

Breaks at the connection of the glow plug arise with the use of the wrong tightening torque of if the wrench was not applied correctly.
Breaks at the connection of the glow plug arise through incorrect use of the tool

Breaks on the case or connection

Such damages arise with the use of the wrong tightening torque of if the wrench was not applied correctly.

Breaks at the connection of the glow plug arise with the use of the wrong tightening torque of if the wrench was not applied correctly.
The use of the wrong tool and/or incorrect torque leads to breaks of the glow plug

Breaks at the connection of the glow plug arise with the use of the wrong tightening torque of if the wrench was not applied correctly.