Maintenance Instructions
B27i
Cleaning
50
CLEANING
CAUTION
If a pressure washer is used on the ex-
posed working parts, avoid water on the
electrical parts and the engine cooling
system.
Engine Air 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 necessary 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.
Rotating Engine Cooling
Air Intake Screen
Keep Rotating Engine Cooling
Air Intake Screen Clean
CAUTION
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:
DANGER
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Check Airflow
with Hand
Check Cooling System 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 oper ating the engine.
CAUTION
DO NOT use a pressure washer to clean
the cooling system on an air-cooled en-
gine, mud may form under the cooling
shroud on the cylinder head and cooling
fan.
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.
Summary of Contents for B27i
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