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 TM 55-1905-221-14-2
5-14. ROCKER ARMS, CAM FOLLOWERS AND PUSHRODS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
inch (0.0025 cm) to .0025 inch (0.0064 cm). A
maximum clearance of .004 inch (0.0102 cm) is
allowable with used parts. Service replacement
bushings must be reamed to size after installation.
b.
Inspect the rocker arms for wear or galling on the
pallets (valve contact surfaces).
c.
Inspect the pushrods, and pushrod spring seats for
wear.
d.
The purpose of a pushrod spring is to maintain a
predetermined load on the cam follower to insure
contact of the cam roller on the camshaft lobe at
all times.
Check the push rod spring load
whenever the cam followers and their related
parts are removed for inspect on.
e.
The pushrod spring is made of wire .177 inch
(0.450 cm) in diameter and has a free length of 2-
5/8 inches (6.655 cm). Replace the spring when a
load of less than 172 pounds (78.019 kg) will
compress it to a length of 2-1/8 inches (5.398 cm).
f.
Examine the cam follower bores in the cylinder
head to make sure they are clean, smooth, and
free of score marks to permit proper functioning of
the cam followers. Clean up any existing score
marks.
5-284
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