TM 5-4310-354-14
KEY to figure 7-35:
(1) Clean all parts in accordance with para
5-7.f.
1.
Lock nut (2)
27.
Lock washer (4)
2.
Washer (2)
28.
Cover
(2) Blow out the rocker arm lubricating
3.
Washer (2)
29.
Gasket
passages with compressed air.
4.
Head cover
30.
Cap screw (2)
5.
Gasket
31.
Cap screw (2)
(3) Check the rocker arms (11) for cracks and
6.
Breather cap
32.
Lock washer (4)
surface
imperfections
by
magnetic
7.
Nut (5)
33.
Thermostat housing
inspection.
8.
Lock washer (5)
34.
Gasket
9.
Retaining ring (2)
35.
Thermostat
(4) Check the spacer springs (12) for
10.
Shaft support (4)
36.
Plug
damaged ends and misaligned coils. A
11.
Rocker arm (8)
37.
Valve seat lock (16)
10-pound (4.5 kg) load on the spring
12.
Spring (4)
38.
Valve spring seat (8)
should compress it to 1 inch (25.4 mm).
13.
Spacer (9)
39.
Valve spring (8)
Replace a damaged or weak spring.
14.
Spacer (2)
40.
Intake valve (4)
15.
Center shaft support
41.
Exhaust valve (4)
(5) Check the ball end of the rocker arm
16.
Adjusting screw (8)
42.
Intake valve stem seal (4)
adjusting screw (16) and the rocker arm
17.
Shaft plug (2)
43.
Valve guide
(11). Replace the screw (16) if flat on
18.
Rocker arm shaft
44.
Tappet (8)
bottom or if there is evidence of scratching
19.
Pushrod (8)
45.
Sleeve washer (4)
or wearing. If rocker arm contact surfaces
20.
Nut (13)
46.
Nozzle holder sleeve (4)
are worn or damaged, replace with new
21.
Washer (13)
47.
Intake manifold stud (2)
rocker arm (11).
22.
Nut
48.
Exhaust manifold stud (8)
23.
Washer
49.
Pipe plug
(6) Check for damaged threads on all
24.
Cylinder head
50.
Pipe plug
adjusting screws (16) and rocker arms
25.
Gasket
51.
Pipe plug
(11).
The adjusting screws are self-
26.
Cap screw (4)
locking and must take a minimum of 3
foot-pounds (0.42 kg-m) torque to turn into
(2) Remove nuts (7) and washers (8) that
the rocker arms. Replace any loose-fitting
secure the rocker arm shaft supports (10)
adjusting screws.
to cylinder head (24). Carefully lift off the
complete rocker arm assembly.
(7) Check the rocker arms (11) for worn shaft
bore diameter. The maximum allowable
(3) Disassemble the rocker arm assembly in
diameter is 0.8665 inch (22.0091 mm).
numerical sequence shown in figure 7-35,
Discard worn rocker arms if damaged or
items 9 through 18, as follows:
worn beyond this limit.
(a) Remove the two retaining rings (9)
(8) Check rocker arm shaft (18) for wear or
from rocker arm shaft (18) ends.
scoring. If shaft has shoulders or ridges
(b) Slide the shaft supports (10), rocker
due to rocker arm action on shaft, replace
arms (11), springs (12), spacers
with new shaft. The rocker arm shaft
(13), spacers (14), and center shaft
diameter should not be worn to less than
support (15) off of rocker arm shaft
0.8560 inch (21.7424 mm).
(18).
(c) Remove adjusting screws (16) from
(9) Inspect the cylinder head cover (4) for
rocker arms (11). Remove shaft
cracks, dents, and distorted sealing area.
plugs (17) only as necessary.
Discard and replace if damaged. Make
sure the breather screen is clean and in
b. Cleaning, Inspection, and Repair.
good condition and that the breather cap
(6) fits securely on the cylinder head cover
(4).
7-39
