Series 50G engines produced after July 1996 and all genset engines use the coil over plug ignition system. This system consists of four coils, four ignition boots, mounting screws and seals, an ignition module, an igniter module bracket, an ignition coil harness, a ground strap, and four spark plugs. The coils mount in the rocker cover directly above the spark plugs. A coil cover mounts in the rocker cover which protects the coils and shields electromagnetic radiation (EMR) from the environment. See Figure
2. Igniter Module Bracket
6. Igniter Coil Harness
3. Igniter Module
7. Coil and Igniter Boot Assembly
4. Spark Plug
8. Ground Strap
Coil Over Plug Ignition System
The ignition coil assembly consists of the ignition coil and integral seal. This is serviced as an assembly, or the seal can be serviced separately. Before the coil can be installed into the engine, it is necessary to attach the boot, mounting screws, and O-rings onto the ignition coil assembly. See Figure
1. Bolt, M6 x 1.0 in.
4. Ignition Coil Assembly
2. Seal Ring (2)
5. Boot and Spring Assembly
3. Ignition Coil Seal
Ignition Coil Assembly
Removal of Ignition Coil
Remove the ignition coil as follows:
Remove the two Phillips screws holding the coil cover in the rocker cover.
Remove the low voltage wire harness connectors at each coil to be removed.
Unscrew the two M6 x 1.0 bolts that attach the coil to the rocker cover. Pull the coil assembly with the boot, mounting screws, and O-rings out of the spark plug well.