Kohler K91 Service Manual page 17

NOTE : Damaged , worn , or loose a ir cleaner com­
ponents could allow unfiltered air i nto the engine
causing premature wear and failure . Replace a l l
damaged o r worn components .
CLEAN A I R I NTAKE /COOLING AREAS
To ensure proper cooling , make sure the grass
screen , cooling fins, and other external surfaces
of engine are kept clean at all times . Every 50
operating hours ( more often under extremely
dusty, d irty conditions) , remove the blower hous­
ing and other cooling shrouds . Clean the cooling
fins and external surfaces as necessary. Make
sure the cooling shrouds are reinstalled . Refer to
the " Disassembly " and " Reassembly" sections for
cooling shroud removal and installation proce­
dures .
NOTE : O perating the engine with a blocked g rass
screen , dirty or p lugged cooling fins, and/or cool­
ing shrouds removed will cause engine damage
due to overheating .
CHECK S PARK PLUG
Every 1 00 operating hours , remove the spark plug ,
check its condition , and reset gap or replace with
new plug as necessary. Refer to Figure 3-3.
""- -
Figure 3-2 . Air Cleaner Components.
1 . Before removing spark plug , clean the area
2. Remove the plug and check its condition . Re­
PREC LEA NER
(OPT ION)
Wire Gauge
Ground Electrode
Figure 3-3. Servicing Spark P l u g .
around the base of plug to keep dirt and de­
bris out of engine.
place the plug if worn or if reuse is question­
able .
3.3