ENGINE
-
GENERAL SERVICES
COOLING
On engines with the standard forced air cooling system, rotation of the blades or fins on the fly
-
wheel causes cooling air to be drawn in through the rotating air screen where it
is
forced through the
blower housing and baffles past the cooling fins on cylinder block and heads where it is finally ejected
as heated air toward the rear of the engine.
In all applications,
recirculation of the heated air must
be
avoided
--
make sure air heated by the engine cannot be drawn back into the air intake.
The rotating air screen and cooling fins must be kept clean and unobstructed at all times. DO
NOT operate engine with blower housing, baffles or any other cooling shrouds removed as this
-
result in improper circulation past the cooling fins and overheating.
Other external surfaces of an engine should also he kept free of oil and dirt accumulation.
This
should be done not only for safety and appearance but because poor cooling efficiency results from
dirty external surfaces on engine and components.
CYLINDER HEAD SERVICE
After each 500 hours of operation, the cylinderheads should be taken off the engine and serviced.
Remove carbon deposits from combustion chamber in head.
Scrape and remove carbon with a sharp
piece of wood
-
-
wood or similar material
is
suggested to avoid scratching aluminum surfaces of head.
Always use new cylinder head gaskets, make sure head bolts are tightened in the proper sequence and
to the torque value stated in the Specification Section.
Before reinstalling the serviced heads, check
and adjust valve
-
tappet clearance per the following instructions.
VALVE
-
TAPPET CLEARANCE
After each 500 hours, check clearance between the valve stems and tappets.
The engine must he
stopped and cooled to normal ambient temperatures to accurately gauge and adjust valve clearances.
Use
the following procedure to adjust:
1. Turn engine over until piston in
#I cylinder (closest to flywheel) is at Top Dead Center on
compression
--
in this position, both valves will be closed and cam will have no affect on
tappet.
2.
Measure clearance between valve stem and tappet with a feeler gauge.
To adjust, turn
adjusting screw on tappet in or out until proper clearance
is
attained.
CLEARANCE SPEC.
K482. K532 K662
-
Intake valve
-
-
cold clearance ,008
-
,010" .006
-
.008"
Exhaust valve
-
-
cold clearance 017
-
.0208' .015
-
,017"
3.
After adjusting valve
-
tappet clearance on #1 cylinder, turn engine over until #2 cylinder is
at TDC on compression and repeat adjustment on this cylinder.
4. After valves are in proper adjustment, position new head gaskets and reinstall cylinder
heads. Make sure head bolts are tightened in
the proper sequence and to the torque value
specified on page
14.3.
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