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 TM 5-1940-277-20
TM 1940-20/2
REMOVE
NOTE
Note the position of the rocker arms as they must go back on the
shaft in the same position.
Tag rockers during removal to assist with installation.
1.
Open and secure engine hatches (refer to paragraph 3-154).
2.
Remove valve cover (refer to paragraph 3-125).
3.
Using 13 mm socket and ratchet, remove screws (2) and (3), and rocker lever assembly (1) from
engine (11).
4.
Remove push rods (10) and (12) from engine (11).
5.
Remove retaining ring (8), washer (7), and intake rocker lever (5) from rocker lever support (1).
6.
Using 3/8 inch wrench, remove nut (6), adjusting screw (9), and rocker lever insert (4) from rocker
lever support (1).
7.
Remove retaining ring (14), washer (15), and exhaust rocker lever (17) from rocker lever
support (1).
8.
Using 3/8 inch wrench, remove nut (18), adjusting screw (13), and rocker lever insert (16) from
exhaust rocker lever (17).
INSPECT
NOTE
Install rockers as tagged in removal.
1.
Inspect rocker levers (5) and (17) for cracks, breaks, surface wear or scoring. Replace rocker
levers (5) and (17) if damage is present.
2.
Inspect rocker lever support (1) for cracks, breaks and other damage. Replace rocker lever
support (1) if damage is present.
3.
Inspect shaft on rocker lever support (1) for cracks, breaks, surface wear or scoring. Replace rocker
lever support (1) if damage is present.
4.
Inspect push rods (10) and (12) for cracks, scoring, and warpage. Replace push rods (10) and (12) if
damage is present.
INSTALL
1.
Using screwdriver install adjusting screw (13) on exhaust rocker lever (17).
2.
Using 3/8 inch wrench, install nut (18) on exhaust rocker lever (17).
3.
Install rocker lever insert (16) on exhaust rocker lever (17).
4.
Install push rods (10) and (12) on engine (11).
5.
Install exhaust rocker lever (17), washer (15), and retaining ring (14) on rocker lever support (1).
6.
Using screwdriver, install adjusting screw (9) on intake rocker lever (5).
7.
Using 3/8 inch wrench, install nut (6) on intake rocker lever (5).
8.
Install rocker lever insert (4) on intake rocker lever (5).
9.
Install intake rocker lever (5), washer (7), and retaining ring (8) on rocker lever support (1).
10.
Using 13 mm socket and ratchet, install rocker lever assembly (1) on engine (11) with screws (2)
and (3). Tighten screws (2) and (3) to 18 lb-ft (24 Nm).
11.
For valve tappet adjustment refer to paragraph 3-128.1.
12.
Install valve cover (refer to paragraph 3-125).
13.
Close engine hatches.
Change 2
3-268.1
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