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Engine cooling system - mt20 and mtefi, Air intake system, Cylinder head cooling fins – Walker MT User Manual

Page 66: Cooling system airflow, Engine cooling system - mtl, Radiator screen and cooling fins, Maintenance instructions

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Maintenance Instructions

CLEANING

64

Engine Cooling System - MT20 and MTEFI

Air Intake System

To prevent engine overheating and possible engine
damage, clean grass clippings, chaff, and dirt from
the rotating engine 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 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 described below.

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 compressed air.
Make sure to reinstall the access panels before op-
erating the engine.

Engine Air Intake Screen

and Cooling Fin Access Panels

Cooling System Airflow

Engine Cooling System - MTL

Radiator Screen and Cooling Fins

To prevent the engine from overheating and possi-
ble engine damage, clean grass clippings, chaff,
and dirt from the fine mesh radiator intake screen
daily. In certain 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 overheating.

1.

Remove the screen. To clean the screen, wash
with soapy water or blow out with compressed
air.

CAUTION

Operating the engine with a blocked air
intake screen, dirty or plugged cooling
fins, and/or cooling shrouds removed will
cause engine damage from overheating.

DANGER

Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.

Kohler Engine

Shroud

Engine Cooling

Fin Access Panels

Engine Air

Intake Screen

Check Airflow

with Hand

Cylinder

Head

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