(1) Operate engine until it reaches operating
seat area is corrected, touch the seat lightly with the
original grinding stone to remove the burred or
ventilation valve and fittings from the valve chamber
(3) Remove the nuts and washers that secure
the valve chamber cover to the cylinder block. Remove
the valve chamber cover and gasket.
(4) With the engine running at operating
temperature and at idle speed, set the intake valves for
0.014-inch (0.0350 cm) clearance as follows:
(a) Alternately pass a 0.013-inch (0.0325 cm)
and a 0.015-inch (0.0375 cm) flat feeler gage between
the head of the adjusting ,;crew of the tappet (13, fig. 4-
Figure 4-5. Narrowing valve seat.
3) and stem of valve (2).
(b) If a 0.013-inch (0.0325 cm) feeler gage
(11) Inspect the spring retainer seats, spring
moves freely back and forth in gap when the valve is
retaining locks, valve stem caps, and valve tappet
not being lifted, and a 0.0015-inch (0.0375 cm) feeler
assemblies for cracks, scoring, overheating, and wear.
gage binds at all times, the clearance requires no
Replace damaged parts.
(c) If a 0.013-inch (0.0325 cm) feeler gage is
gripped at all times, the clearance is insufficient.
(d) Hold valve lifter with an open end wrench
(1) Position the valve tappet assemblies (13,
while using a second wrench to turn adjusting screw
fig. 4-3) in the engine block.
one-quarter to one-half turn clockwise.
(2) Assemble the valves (2 and 7), valve
clearance check and adjustment until you obtain the
springs (5 and 10), spring retainers (4 and 9), valve
proper clearance. The adjustable-type valve lifters have
rotators (3 and 8), and valve locks (1 and 6). Compress
self-locking adjusting screws that require no lock nuts.
the valve springs with a spring compressor to install the
(e) If a 0.015-inch (0.0375 cm) feeler gage
valve locks. Turn the engine over as necessary to allow
moves freely when valve is not being lifted, the
each valve to move to the closed position before
clearance is too great. Hold valve lifter with an open
attempting to install the valve parts. Make sure that you
end wrench while using a second wrench to turn valve
install each valve into the guide from which it was
lifter adjusting screw counterclockwise one-quarter to
Repeat the clearance check and
(3) With the engine stopped, temporarily set
adjustment until proper clearance is obtained.
the intake valve-to-tappet clearance to 0.014 inch
(5) Adjust the exhaust valves to a 0.016-inch
(0.0350 cm) and the exhaust valve-to-tappet clearance
(0.0400 cm) (hot) clearance in the manner described
to 0.017 inch (0.0425 cm) (cold).
above, using 0.015 (0.0375 cm) and 0.017 inch (0.0425
(4) Install the cylinder head (para 4-3).
cm) feeler gages.
(5) Operate the engine until it reaches
operating temperature. Adjust valve-to-tappet clearance
4-5. Oil Pan and Filler Blocks
as directed in subparagraph e below.
(6) Install the valve chamber cover (7, fig. 4-
(1) Remove the drain plug (1, fig. 4-6) and
drain the engine oil into a suitable container. Remove
e. Valve Adjustment.
the oil drain piping (items 2 through 4).