ENGINE AR.-SE 2L7218 - Caterpillar

Maintenance: If it is suspected that the glow plugs are not correctly assisting in starting, the system should be checked for defective glow plugs with the engine stopped. The ammeter should be observed when making this check to show that each glow plug uses approximately 5 amperes.To check, move the HEAT-START switch to the HEAT position. A reading on the ammeter should be approximately equal to the number of glow plugs in the system multiplied by 5. Any reading that varies appreciably from this may indicate one or more defective glow plugs.To locate the defective glow plug or plugs, check each glow plug separately by removing the leads from the glow plugs one at a time with the HEAT switch in the ON position. Reconnect the lead to the plug before removing the lead from the next glow plug to be checked. When a lead is removed from a glow plug, with no variation shown on the ammeter, it can be assumed that the plug is defective and should be replaced.To remove a defective glow plug, disconnect the lead from the glow plug and unscrew the glow plug from the precombustion chamber.Apply anti-seizure compound such as white lead to the thread of the new glow plug and install the glow plug into the precombustion chamber tightening it to a torque of 10 to 12 pounds feet.The glow plug should first be removed before removing and replacing a fuel injection valve to eliminate the possibility of damaging the glow plug.
GLOW PLUG