TM 5-4310-276-14
(12) Inspect cylinder head for cracks, broken
(2) Remove nuts (12) and screws (14).
fins, warpage, leakage, stripped or damaged threads
(3) Remove clip (10), shaft (11), bearings (15),
and rocker assembly supports for wear.
and rocker arms (13).
(13) Repair or replace any damaged or de-
(4) Remove retainers (6), roto caps (7), and
fective part.
springs (8), and valves (9).
d. Reassembly.
(5) Remove studs (16, 17) from head (5).
c. Cleaning and Inspection.
(5).
(2) Install valves (9), springs (8), roto caps (7),
and retainers (6).
(3) Install rocker arms (13), bearings (15),
Drycleaning solvent, P-D-680, used to
shaft (11) and clip (10).
clean parts is potentially dangerous to
(4) Install screws (14) and nuts (12).
personnel and property. Avoid re-
(5) Install housing (4), rod assembly (3), pack-
peated and prolonged skin contact.
ing (2), and screw (1).
Do not use near open flame or exces-
e. Installation.
sive heat.
(1) Use new gaskets and seals and install the
cylinder head. Fasten with four nuts and washers.
Torque to 140-155 inch-pounds.
(1) Clean all parts with drycleaning solvent,
(2) Install breather line and fasten connector
nut at each end.
(2) Inspect rocker arm needle bearings for
(3) Install exhaust manifold-muffler (para. 6-
missing needless or wear.
9), and
torque nuts to
60-85 inch-pounds.
(3) Inspect rocker arm and rocker shaft for
cracks, breaks, wear or evidence of overheating.
torque bolts to 45-50 inch- pounds.
(4) Inspect valve adjustment assembly for
wear, stripped or damaged threads.
(5) Install spark plug and
torque to
275-300
inch-pounds.
(5) Inspect valve rotocaps for wear and proper
operation.
(6) Install spark plug cable and fasten con-
nector nuts at each end.
(6) Inspect pushrods and housings for cracks,
breaks, bends, dents or wear.
(8) Use a new gasket and install it along with
(7) Inspect intake and
exhaust valves for
the rocker arm cover. Fasten the cover with the
cracks, breaks, bent stems, pitting burned areas or
wear.
mounting screw.
(9) Connect ignition switch leads and install
(8) Inspect valve guides and seats for cracks,
flywheel fan cover. Fasten with seven screws (fig. 6-
breaks, wear and correct seat angle.
(9) Inspect valve springs and retainers for
(10) Install cylinder head covers and fasten
cracks, breaks, distortion or wear.
with five screws.
NOTE
The valve springs should test to the following di-
mensions: Free length 1.275 in. (3.24 cm)
Load at compressed-length of 1.095 in. (2.78 cm) =
6-12. Valve Clearance Adjustment
201bs. 1 lb. (9.07 0.45 kg). Load at compressed
a. General. The cylinder heads are inter-
length of 0.880 in. (2.24 cm) = 441bs. 2 Ibs. (19.96
changeable between the three models and the adjust-
0.90 kg). Refer to table 1-1 for all other correct
measurement.
ment is the same for the three models.
b. Removal.
(1) Remove relief valve.
(10) Grind valves and lap them to the seat in-
serts individually to insure a sealed fit between the
(2) Remove valve cover mounting screw and
remove valve cover and gasket.
valve and valve inserts.
(11) Inspect the cylinder holddown studs and
c. Adjustment.
nuts for cracks, breaks and stripped or damaged
threads.
6-14