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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Cooling System Airflow
Cylinder Head Cooling Fins - Model MS
It is essential for performance and longevity of the air-
cooled engine to keep the cylinder head cooling fins
clean and free of obstruction. After every 8 hours of
operation, check the performance of the cooling system
by starting the engine, holding a hand adjacent to the
cylinder head, and feeling the cooling airflow. If there is
little or no airflow, clean the cooling fins as follows:
NOTE: The planned maintenance schedule calls for
cleaning the cylinder head cooling fins yearly or every
300 hours as a minimum.
Cooling System Airflow
1. Inspect accessible cooling fins and clean with com-
pressed air as needed. If the buildup is excessive,
refer to step 2.
2. Remove the spark plug wire and disconnect the
breather tube on the valve cover. Do not discon-
nect the breather tube from the carburetor side.
Remove the cylinder head shroud by removing the
five (5) bolts, as shown in the Inspect and Clean
Cylinder Head Cooling Fins photo. Cover the
breather tube end and spark plug boot before
cleaning out the cooling fins. Clean the cooling fins
by blowing with compressed air. If the buildup is
excessive, use a piece of wire to probe into the fins
for cleaning.
3. Reinstall the shrouds by reversing the preceding
steps. Start the engine and confirm the cooling air-
flow.
Inspect and Clean
Cylinder Head Cooling Fins - Model MS
(viewed from left side of tractor)
Engine Cooling System - Model MD, MTL
Radiator Screen and Cooling Fins
To prevent the engine from overheating and possible
engine damage, clean grass clippings, chaff, and dirt
from the fine mesh radiator intake screen daily. In cer-
tain mowing conditions (dry grass, leaves, tree “cotton”,
etc.), it may be necessary to check and clean the
screen several times during use to prevent engine over-
heating.
1. Remove the screen. To clean the screen, wash
with soapy water or blow out with compressed air.
2. Inspect the radiator cooling fins for material lodged
in this area which would restrict cooling airflow.
Use pressurized air or water to clean. DO NOT use
any tool, like a screwdriver or knife, to clean ma-
terial out of the fins as this may damage the cooling
fins. DO NOT use cold water on a hot radiator.
DANGER
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Check Airflow
with Hand
Cylinder
Head
Check for Airflow
Cylinder Head
Shroud
Breather
Tube
Cylinder Head
Shroud Bolts
Spark Plug
Wire
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