Engine Cooling System; Cooling Air Intake Screen; Cylinder Head Cooling Fins - Walker T27i Operator's Manual

T27i

Engine Cooling System

Cooling Air Intake Screen

To prevent engine overheating and possible engine
damage, clean grass clippings, chaff, and dirt from
the rotating engine cooling air intake screen after
every 8 hours of operation. In certain mowing
conditions (dry grass, leaves, tree "cotton", etc.), it
may be nec essary to check and clean the screen
several times each day to prevent engine over-
heating. Also, visually check inside cylinder head
shroud and between cylinder head fins for material
packed in this area which would prevent cooling
airflow; remove shroud and clean as required.
Operating the engine with a blocked air in-
take screen, dirty or plugged cooling fins,
and/or cooling shrouds removed will cause
engine damage from overheating.

Cylinder Head Cooling Fins

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:
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Every 100 hours, inspect and clean the cooling
fins (more often when operating in extremely dusty,
dirty conditions). Remove the two (2) cooling fin
access panels in the engine shroud and clean the
cooling fins and external surfaces using com-
pressed air. Make sure to reinstall the access
panels before op erating the engine.
CAUTION
DANGER
Maintenance Instructions
CAUTION
DO NOT use a pressure washer to clean the
cooling system on an air-cooled engine;
mud may form under the cooling shroud on
the cylinder head and cooling fan resulting
in engine overheating.
NOTE: If dirt is packed into the cooling fins it may
be necessary to remove the engine shroud in order
to thoroughly clean the cooling fins.
Engine Cooling
Fin Access Panels
Kohler Engine
Shroud
Engine Cooling
Air Intake Screen
Keep Rotating Cooling Air Intake
Screen and Cooling Fins Clean
IMPORTANT: Yearly, it is good maintenance prac-
tice to remove the engine cooling shroud and clean
the cylinder head cooling fins thoroughly to prevent
overheating and extend engine life. Make sure
cooling shroud is reinstalled properly. This proce-
dure will require removing the engine from the
chassis.
Check Airflow
with Hand
Check Cooling System Airflow
Cleaning
Cylinder Head
(Not Visible)
69