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MAINTENANCE
VALVE CLEARANCE
ADJUSTMENT
Check valve clearance
after every 480
hour s of operation and adjust the clearance
if necessary.
A clearance
of 0.023 inch is
neces sary between the valve lever s and the
valve sterns when the valves are closed and
the engine is hot.
The clearance
should be
0.025 inch when the engine is
cold.
1. Before checking the valve clearance,
disconnect the coil-to-distributor
cable from
the coil end. This will prevent accidental
starting.
2. Pull the compression
release
rod out
to the starting position.
3.
Remove the hood sheet.
4. Remove the valve covers.
5. Remove the spark plug from No.1 cyl-
inder (the cylinder next to the radiator).
Place your thumb over the spark plug opening
and have the engine cranked slowly until an
outward pressure
can be felt.
Pressure
indi-
cates the No. 1 piston is moving toward top
dead center of the compression
stroke.
Con-
tinue crltnking slowly until the "DC" mark on
the flywheel is in-Lin e with the pointer as seen
through the opening in the flywheel housing.
Both valves are now closed on the compres-
sion stroke of No.1 cylinder.
111ust.
5~
Showing "~C" mark on the flywheel.
6. Check the clearance
01 the No, 1
valves and adjust if necessary
as follows:
Loosen the adjusting screw lock nut on both
the No.1 intake and exhaust valve levers.
In-
sert the feeler gauge between the valve lever
and valve stern.
Turn the adjusting screw in
or out as necessary
to hold the feeler gauge
snugly.
When the correct
clearance
is se-
cured, hold the adjusting screw in place with
a screwdriver
and tighten the lock nut. Ad-
just both the intake and exhaust valve levers
in this
manner.
t
7. Crank the engine
1/3
revolution at a
time and check the clearance
of the valves for
each cylinder and adjust if necessary.
Do
this on each set of cylinder valves in succes-
sion according to the firing order of the en-
gine which is 1, 5, 3, 6, 2, 4.
8.
Install the valve covers.
Check to see
that the gaskets make oiltight
seals.
Use new
gaskets if
necessary.
9. Install the spark plug and cable.
10. Instal1.the hood sheet.
11. Connect the coil-to-dist~ibutor
cable.
I 1lust.
55
Adj uS,ting valve clearance.
60
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