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Remove Air Cleaner, Valve Covers,
Breather, And Spark Plugs
1, Disassemble air cleaner.
Disconnect breather
tube from air cleaner base.
Remove base from air
intake elbow and intake manifold.
2. Remove the valve cover and breather assembly
fram the #1 cylinder barrel. Remove the valve
cover from the #2 cylinder barrel.
3. Remove the spark plugs.
Measure Valve-to-Tappet Clearance
IMPORTANT:
The piston must be at top dead center (TDC) of the
compression stroke to measure valve-to-tappet clear-
ance. By rotating the flywheel and observing the
valves and tappets for movement, it can be deter-
mined if a cylinder is at TDC.
If, for example, the flywheel is rotated and movement
is noticed in the #2 side valve box--the opposite cyl-
inder (#1 side) will be at TDC and valve-to-tappet
clearance can be measured.
Rotating the flywheel one complete revolution (360°)
will then cause movement in the #1 side valve box—
the #2 side cylinder will be at TDC, enabling measure-
ment of valve-to-tappet clearance for that side.
Clearance Specifications--
Intake Valve
(Closest to Flywheel)
.003"/.006"
Exhaust Valve (Seria! No. 1816500646 and earller)
(Closest to PTO)
-016"/.019"
Exhaust Valve (Serial No. 1816500656 and later)
(Closest to PTO)
-011"/.014"
1. Retate the flywheel and look into the valve boxes.
The valves and tappets will move in only one of
the boxes.
Measure the valve-to-tappet clear-
ance for the cylinder in which no movement was
Observed--use a flat feeler gauge.
Refer to
Figure 3-11.
SECTION 3
PERIODIC MAINTENANCE
2. Rotate the flywheel 360° and measure the valve-
to-tappet clearance for the remaining cylinder.
3. If clearance is too small, remove the valves and
grind the valve stems until the correct clearance Is
Obtained.
Make sure valve stems are ground per-
fectly flat and smooth.
If clearance is too large, replace the valves and
recheck clearance.
NOTE:
Large clearance can also be reduced by
grinding the valves and/or valve seats.
Refer to the "Inspection And Repair/
Reconditioning" Section for valve
specifications.
Reinstall Spark Plugs, Breather, Valve
Covers, and Air Cleaner
1. Reinstall spark plugs and torque to 10/15 ft. Ib.
2. Reinstall valve cover to 22 cylinder barrel.
Reinstall breather assembly and valve cover to
#1 cylinder barrel. Make sure breather is as-
sembled correctly using new gaskets.
3. Reinstall air cleaner base to intake manifold and
air intake elbow using new gasket.
4. Insert end of breather tube through hole in air
cleaner base.
NOTE:
Make sure breather tube seals tightly in
breather cover and in air cleaner base to
prevent unfiltered air from entering engine.
5. Reassemble remaining air cleaner components
and tighten wing nut(s) 1/2 to 1 full turn after nut
contacts cover. Do not overtighten.
6. Reconnect spark plug leads.
3.7
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