Fuel Filter - Kohler Triad OHC TH520 Owner's Manual

Clean Air Intake/Cooling Areas
To ensure proper cooling, make sure the grass screen,
cooling fins, and other external surfaces of the engine
are kept clean at all times.
Every 100 hours of operation (more often under
extremely dusty, dirty conditions), remove the blower
housing* and other cooling shrouds. Clean the cooling
fins and external surfaces as necessary. Make sure the
cooling shrouds are reinstalled.
NOTE: Operating the engine with a blocked grass
screen, dirty or plugged cooling fins, and/or
cooling shrouds removed, will cause engine
damage due to overheating.
*Cleanout kits 25 755 20-S (black) or 25 755 21-S
(gold) allow inspection and cleanout of the cooling fins,
without removing the blower housing.
Ignition System
This engine is equipped with an electronic CD ignition
system. Other than periodically checking/replacing the
spark plugs, no maintenance, timing, or adjustments
are necessary or possible with this system.
In the event starting problems should occur which are
not corrected by replacing the spark plugs, see your
Kohler Engine Service Dealer for trouble analysis.
Check Spark Plugs
Every 200 hours of operation, remove the spark plugs,
check condition, and reset the gap or replace with new
plugs as necessary. Use Champion
equivalent) spark plugs, Kohler Part No. 12 132 02-S.
1. Before removing the 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. Replace
the plug if worn, or reuse is questionable.
NOTE: Do not clean the spark plug in a machine
using abrasive grit. Some grit could
remain in the spark plug and enter the
engine causing extensive wear and
damage.
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 11.
Figure 11. Servicing Spark Plug.
Battery Charging
Batteries produce explosive hydrogen gas while being
charged. To prevent a fire or explosion, charge
batteries only in well ventilated areas. Keep sparks,
open flames, and other sources of ignition away from
® type RC12YC (or
the battery at all times. Keep batteries out of the reach
of children. Remove all jewelry when servicing
batteries.
Before disconnecting the negative (-) ground cable,
make sure all switches are OFF. If ON, a spark will
occur at the ground cable terminal which could cause
an explosion if hydrogen gas or gasoline vapors are
present.
NOTE: Do not apply 12 volt DC to kill terminal of

Fuel Filter

Some engines are equipped with an in-line fuel filter.
Periodically inspect the filter and replace every 200
operating hours. Use a genuine Kohler filter, Part No.
25 050 22-S.
Wire Gauge
Spark Plug
Ground
Electrode
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 24.4-29.8 N·m
(18-22 ft. lb.).
WARNING: Explosive Gas!
ignition module.
0.76 mm
(0.030 in.)
Gap
11