TM 5-4310-227-15
a. Removal.
(1) Disconnect the breather line coupling
nut (11, fig. 3-2 ), from the crankcase
breather line elbow (12).
(2) Disconnect the coupling nut from the
air cleaner bracket breather line elbow
(12). Remove the breather line (10).
b. Cleaning, Inspection, and Repair.
(1) Clean the breather line in approved
cleaning solvent and dry thoroughly.
Be sure that the breather line is free
from restrictions.
(2) Inspect the breather line for cracks,
breaks, bends, and damaged threads.
(3) Repair or replace the breather line as
necessary.
c. Installation.
(1) Connect the coupling nut (11) to the
crankcase breather line elbow (12).
(2) Connect the coupling nut to the air
cleaner bracket breather line elbow
(12).
1 Cylinder and crankcase assembly
3-69. Valves
2 Valve chamber access cover
S Washer, flat, copper, 5/16 in.
a. Valve Chamber Cover Removal.
4 Bolt, machine, 5/16-18 X 2 in.
(1) Remove the air cleaner, bracket carbu-
retor, and intake manifold assembly
c. Valve Adjustment.
(1) Disconnect the ignition cable from
(2) Remove the fuel strainer to-carbure-
the spark plug (para 3-45).
tor tube (para 3-34).
(2) Rotate the engine crankshaft until
(3) Remove the bolt (4, fig. 3-27) and
the valve lifter is at its lowest
flat washer (3) that secure the valve
position.
chamber access cover (2) to the en-
(3) Insert a feeler gage between the valve
gine cylinder and crankcase assembly
(1, fig. 3-28) and the lifter adjust-
(1). Remove the valve cover gasket
ment screw (2). The correct clearance
(13, fig. 3-18),
with the engine cold is 0.008 inch for
b. Cleaning and Inspection.
the intake valve and 0.016 inch for
(1) Clean `the valve cover in an approved
the exhaust valve.
cleaning solvent and dry thoroughly.
(4) To obtain the correct clearance, hold
(2) Inspect the cover for cracks, breaks,
the valve lifter (3) and turn the ad-
dents, and other damage. Inspect the
justment screw (2) until the feeler
gasket for an unserviceable condition.
gage has a slight drag when it is
(3) Inspect the valve chamber for dirt
withdrawn. The adjusting screw is
and sludge and remove with a clean
self-locking and will remain at the set
c l o t h dampened with an approved
position.
cleaning solvent.
(5) Measure and adjust the other valve
in the same manner.
(4) Replace all defective parts.
