SERIES 50 SERVICE MANUAL
15.15.3
Installation Ignition Coil Harness
Install the ignition coil harness as follows:
1. Press the connectors of the ignition coil harness onto the four ignition coils.
2. Connect the ignition coil harness to the igniter module.
3. Connect the ignition coil harness to the 12 volt power supply.
4. Connect the ignition coil harness to the ECM.
5. Attach the harness clips to the rocker cover and cylinder block.
6. Add anti-seize compound to the two coil cover mounting screws to aid removal in the
future.
7. Install the coil cover on the rocker cover with the two Phillips mounting screws.
All information subject to change without notice.
(Rev. 2005)
6SE50 0403 Copyright © 2005 DETROIT DIESEL CORPORATION
From Bulletin 2–50–05
15-35
15.16
SPARK PLUGS
15.16 SPARK PLUGS
The condition of the spark plug determines the high voltage level and is the single most important
component in the ignition system. The size of the electrode gap, condition of the electrodes, and
the amount of deposits on the electrodes all affect the life of the spark plug. The electrodes of the
spark plug are made from platinum or iridium which will minimize electrode wear.
The spark plug can be regapped if the electrode wear and amount of deposits are low. If either of
these conditions are excessive, replace the spark plug.For engine model 6047-TKG8 measure the
spark plug gap using a 0.381 mm (0.015 in.) feeler gage. Effective with engine serial number
04R0045632 model 6047-MKG8 measure the spark plug gap using a 0.254 mm (0.010 in.)
feeler gage.
NOTE:
Servicing of the spark plugs should take place while the engine is cool. This will facilitate
easier removal of the spark plugs and reduce the possibility of the plug sticking in the
spark plug insert contained in the cylinder head; this also ensures the correct torque and
eliminates damage to the spark plug and gasket during installation of the plugs.
15.16.1
Removal of Spark Plug
Remove the spark plug from the cylinder head as follows:
1. Remove the ignition coils. Refer to Section 15.11.1.
2. Remove the plug using a 5/8 in. thin wall spark plug socket and appropriate extensions.
15.16.1.1
Cleaning of Spark Plug Terminal, Ceramic Insulation, and Socket
Area
Clean the spark plug terminal, ceramic insulation, and spark plug socket as follows:
EYE INJURY
To avoid injury from flying debris when using compressed
air, wear adequate eye protection (face shield or safety
goggles) and do not exceed 276 kPa (40 psi) air pressure.
1. Remove dirt and debris with compressed air.
2. Remove oil and grease deposits.
3. Inspect the spark plug.
(Rev. 2005)
15-36
From Bulletin 2–50–05
All information subject to change without notice.
6SE50 0403 Copyright © 2005 DETROIT DIESEL CORPORATION
SERIES 50 SERVICE MANUAL
15.16.1.2
Inspection of Spark Plug
Inspect the spark plug as follows:
1. For engine model 6047-TKG8 measure the spark plug gap using a 0.381 mm (0.015
in.) feeler gage. Effective with engine serial number 04R0045632 model 6047-MKG8
measure the spark plug gap using a 0.254 mm (0.010 in.) feeler gage.
[a]
If the spark plug gap measured is not to specifications, regap the plug and reuse.
Refer to Section 15.10.2.
[b]
If the spark plug gap is within specifications, reuse the spark plug. Refer to Section
15.10.2.
2. Visually check the spark plugs for excessive deposits and condition of the electrode.
[a]
If the spark plug has excessive deposits and electrode wear, replace the spark plug.
Refer to Section 15.10.2.
[b]
If the spark plug has no deposits nor excessive electrode wear, reuse the spark plug.
Refer to Section 15.10.2.
15.16.2
Installation of Spark Plug
Install the spark plug as follows:
1. Install the spark plug using a 5/8 in. thin wall socket and appropriate extensions. Torque
the spark plug to 35-40 N·m (26-30 lb·ft).
2. Install the ignition boot. Refer to Section 15.5.2.
3. Install the ignition harness. Refer to Section 15.3.2.
All information subject to change without notice.
(Rev. 2005)
6SE50 0403 Copyright © 2005 DETROIT DIESEL CORPORATION
From Bulletin 2–50–05
15-37
15.16
SPARK PLUGS
(Rev. 2005)
15-38
From Bulletin 2–50–05
All information subject to change without notice.
6SE50 0403 Copyright © 2005 DETROIT DIESEL CORPORATION