Section 7. Electrical System And Components - Kohler Command PRO ECH630 Service Manual

Electrical System and Components
This section covers the operation, service, and repair
of the electrical system components. Systems and
components covered in this section are:
• Spark Plugs
• Batt ery and Charging System
• Electric Starter
Spark Plugs
Engine misfi re or starting problems are oft en caused
by a spark plug that has improper gap or is in poor
condition.
The engine is equipped with the following spark
plugs:
Type: The standard spark plug is a Champion
RC12YC (Kohler Part No. 12 132 02-S).
RFI compliant engines use a Champion
XC12YC (Kohler 25 132 14-S) spark plug. A
high-performance spark plug, Champion
Platinum 3071 (used on Pro Series engines,
Kohler Part No. 25 132 12-S) is also available.
Equivalent alternate brand plugs can also be
used.
Gap: 0.76 mm (0.030 in.)
Thread Size: 14 mm
Reach: 19.1 mm (3/4 in.)
Hex Size: 15.9 mm (5/8 in.)
Spark Plug Service
Remove the spark plugs aft er every 200 hours of
operation. Check their condition and either reset the
gap or replace with new plugs as necessary. To service
the plugs, perform the following steps:
1. Before removing a spark plug, clean the area
around the base of the plug to keep dirt and
debris out of the engine.
2. Remove the plug and check its condition. See
Inspection following this procedure. Replace the
plug if necessary.
Electrical System and Components
Section 7
NOTE: Do not clean spark plugs in a machine
3. Check the gap using a wire feeler gauge. Adjust
the gap to 0.76 mm (0.030 in.) by carefully
bending the ground electrode. See Figure 7-1.
Wire Gauge
Spark Plug
®
®
®
Ground
Electrode
Figure 7-1. Servicing Spark Plug.
4. Reinstall the spark plug into the cylinder head
and torque to 24.4-29.8 N·m (18-22 ft . lb.).
Inspection
Inspect each spark plug as it is removed from
the cylinder head. The deposits on the tip are an
indication of the general condition of the piston rings,
valves, and fuel injection system.
Normal and fouled plugs are shown in the following
photos:
using abrasive grit. Some grit could
remain in the spark plug and enter the
engine, causing extensive wear and
damage.
(0.030 in.) Gap
Section 7
7
0.76 mm
7.1