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9-1 2
E N GIN ES-&CY
Ll NDER
test 137 to 150 lbs. when compressed to 15/ls inches.
Replace springs that do not meet these specifications.
(2) Inspect each valve spring for squareness with a
steel square and surface plate,
test
springs from both
ends, as shown in Figure 16.
If the spring is more than
'Il6
inch out of square, in-
stall a new spring.
Installation
(1) Coat the valve stems with lubrication oil and
insert them in the cylinder head.
(2) If
valves or seats are reground, test the valve
stem height with Tool (2-3746. If the valve is too long,
grind off the tip until the length is within the limits.
(3) Install new cup seals on all valve stems (long
seal on intake valve and short seal on exhaust valve)
and over valve guides (Figs. 17 and 18).-Install valve
springs and retainers.
(4)
Compress the valve springs with Tool C-3422A,
install the locks and release the tool.
If the valves and/
or seats are reground, measure the installed height of
springs. Make sure measurement i s taken from the
bottom of the springs seat in the cylinder head to the
bottom surface of the spring retainer.
(If spacers are
installed, measure from the top of spacer).
If
the
height
is
greater than
lll/l,j
inches, install a
'Il6
inch
spacer in the head counterbore to bring the spring
height
back to normal
inches to
111/16
inches.
TESTING VALVE TIMING
(1) Rotate the crankshaft until No. 6 exhaust valve
is closing and No. 6 intake valve is opening. Install a
dial indicator so that the indicator pointer contacts
the valve spring retainer on No.
1
intake valve paral-
lel to the axis of the valve stem.
(2) Turn No. 1 intake adjusting screw in one com-
plete turn to remove the lash. Adjust the dial indi-
cator to zero. Rotate the crankshaft clockwise (normal
running direction) until the valve has lifted .019 inch.
Fig. 1 &Inspecting
Valve Spring Squareness
2,)
KUSlA
Fig. 77-Valve
Assembly
The timing of the crankshaft pulley should now rea,d
from 12 degrees before top dead center to dead cen-
ter. Readjust the lash.
(3) If the reading is not within the specified limits:
(a) Inspect the sprocket index marks.
(b) Inspect the timing chain for wear.
(c) Inspect the accuracy of the "DC" mark on the
timing indicator.
TIMING SPROCKETS AND CHAIN
Removal
(1)
Drain the cooling system.
(2) Remove the radiator and fan.
(3) Install Tool C-3732A and pull the vibration
damper assembly off the end of the crankshaft (Fig.
19).
A
/,CUP
SEAL
Fig. I 8 4 n s t a l l i n g Valves and Cup Seals
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