Kohler COM7.5, Руководство по обслуживанию

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TP-6120 5/02 10 Section 2 Scheduled Maintenance
2.6 Ignition System
2.6.1 Ignition System Description
The COM7.5 engine uses a capacitive discharge
ignition system.
Refer to the CH20 Engine Service
Manual for ignition service information.
Maintain the spark plugs using the instructions in
Section 2.6.2.
2.6.2 Spark Plug
Reset the spark plug gap or replace the plug if
necessary. Replace the plug at the intervals shown in
the service schedule, Figure 2-1.
1. Clean the area around the base of the spark plug to
keep dirt and debris out of the engine.
2. Remove the spark plug and check its condition.
Verify that the insulator is a light toast or gray color.
Replace the spark plug if the insulator is
discolored, the plug is coated with deposits, or the
electrodes are pitted or worn.
3. Check the spark plug gap using a wire feeler
gauge. Adjust the gap to 0.76 mm (0.030 in.) by
carefully bending the ground electrode.
See
Figure 2-5 and Figure 2-6.
1--514
Figure 2-5 Checking the Spark Plug Gap
1--511
Figure 2-6 Adjusting the Spark Plug Gap
2.7 Cooling System
To prevent generator set damage caused by
overheating, keep the housing cooling inlets and outlets
clean and unobstructed at all times.
Note: Do not block the generator set cooling air inlet.
2.8 Exhaust System
Remove all combustible materials from the exhaust
location.
Combustible materials include building
materials as well as natural surroundings. Keep dry field
grass, foliage, and combustible landscaping material a
safe distance from the exhaust outlet.
Periodically inspect the exhaust system components
(exhaust manifold, exhaust line, flexible exhaust,
clamps, silencer, and outlet pipe) for cracks and
corrosion.
D
Check for corroded or broken metal parts and replace
as needed.
D
Check for loose, corroded, or missing clamps and
hangers. Tighten or replace clamps and/or hangers
as needed.
D
Check for and remove loose insulation in the exhaust
duct.
D
Check that the exhaust outlet is clear.
2.9 Fuel System
2.9.1 Gas Piping
Ensure the gas pipe size meets size specifications in the
chart.
Measure the pipe length from the gas utility
pressure regulator (7-11 in. water column output
pressure) to the end of the pipe where it connects to the
fuel inlet of the generator set. Compare the length with
the chart in Figure 2-7. Replace piping longer than the
listed maximum length with the specified pipe size.
Verify that the gas installer bleeds air from the gas lines
at the time of installation.
Pipe Size Maximum Pipe Length
1/2 in. NPT 3.0 m (10 ft.)
3/4 in. NPT 10.7 m (35 ft.)
1 in. NPT 30.5 m (100 ft.)
Figure 2-7 Maximum Gas Pipe Length