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SEBU8430-02
Inspect the Spark Plug
Inspect the spark plug closely for damage. The
condition of the spark plug can indicate the operating
condition of the engine.
Illustration 53
1. Remove the lead (1) for the spark plug from the
ignition coil.
2. Install tooling (A). Remove the spark plug (2).
Replace the Spark Plug
The spark plug is not a serviceable part. A
replacement spark plug must be used.
Table 21
Required Tools
Tool
Part Number
Cylinder head spark plug thread
27610178
B
cleaning tool
Ensure that the threads in the cylinder head are not
damaged. Clean the threads in the cylinder head by
using tooling (B).
Install the spark plug by using tooling (A). Tighten the
spark plug by hand and then tighten the spark plug to
a torque of 50 N·m (36 lb ft).
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Part Name
1
Ignition System Timing - Check/Adjust
On the initial start-up of a new engine or an engine
that has been serviced, it is possible for
condensation to have built up in the spark plugs. If
this occurs, refer to this manual, "Cold Weather
Starting".
Ignition System Timing -
Check/Adjust
After maintenance has been performed on the
ignition system, check the timing of the ignition
system. Adjust the timing, if necessary.
The optimum ignition timing for a gas engine varies
according to several factors:
• Compression ratio of the engine
• Inlet air temperature
• Methane number of the gas
Note: Refer to this manual, "Plate Locations and Film
Locations" in order to find the correct ignition timing
for the engine.
1. Install a timing light to the lead on number One A
cylinder for the 4016TRS Gas.
Note: The leads for the timing light must not come in
contact with the exhaust manifold.
Illustration 54
Typical example
71
Maintenance Section
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