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MAINTENANCE WHEN REPLACING GLOW PLUGS, SPECIAL ATTENTION MUST BE
PAID TO THE FOLLOWINGS ASPECTS:
• leave to cool the engine;
AND REPLACE- • make sure that the key for the starting of the engine is on OFF
position;
• dirt around the hole for the plug must not fall into the
MENT combustion chamber under any circumstances;

• glow plugs must be removed by using special plug box wrench;
• glow plugs must be ftted by using special plug box wrench and
tightened, if possible, by using a torque wrench;
• the power connection nuts for the electric connection of the
glow plug, must be tightened to the correct torque. Otherwise,
the glow plug may be damaged by excessive torque. This can
result in irreparable damage to the plug (connecting stud shear
or overheating due to closed annular gap);

REMOVING THE GLOW PLUG
• remove the power connection nuts by using a plug box wrench
(7mm or 8mm);
• by using a brush, clean the hollow around the glow plug without
removing it;
• remove the glow plug with a plug box wrench (the key can vary
from 3/8” to 21mm, according to the nut of the glow plug);

GLOW PLUG INSTALLATION
Recommended torque specifcation for RPOWER glow plugs:
1 - Use the correct wrench for the Glow Plug and
2 - When changing glow plugs, make sure that oil, dirt etc. on the
outside of the disassembled glow plug does not enter into the cylinder.
3 - When mounting the glow plug, clean the engine side of the fange
and make sure the glow plug is correctly inline with the thread of the
cylinderhead.
4 - Make sure the plug is correctly positioned and tighten it by hand
until it cannot be tightened any further.
5 - Then, use a torque wrench to tighten it accurately to the torque
showed in the chart below.
! DO NOT USE A THREAD LUBRICANT!

If a thread lubricant such as grease is coated on the thread, the
resistance between the glow plug and the cylinderhead will be less ->
resulting in over tightening

! Tightening more than the torques shown in the table could result in
damage to the glow plug and engine.
! Glow plug failure is most commonly caused from over voltage and/
or excessive heat. Glow plugs are designed to operate between 850 to
1200 degrees. When the electrical current to the glow plug is held too
long it can lead to overheatinh which will cause the glow plug to swell,
split or burst and cause immediate failure. Overly advanced injection
timing, leaky injectors, or running gasoline in your engine will cause
the combustion temperature to get hot enough to damage the glow
plug.
A faulty relay and controller can also cause glow plug failure so it is
advisable to check out the entire system before changing to new glow
plugs.

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