TM 5-3810-289-34
c. Cleaning and Inspection.
(1) Clean push rods in an approved solvent.
(2) Check injector and valve push rod ball
end with radius gage for wear, figure 3-148.
(a) Ball end diameter, intake and exhaust
push tube: 0.623/0.625 in.
(b) Ball end diameter, injector push tube:
0.685/0.687 in. with 1/8 in. diameter flat at bottom.
(3) Check socket of push tube with ball end
of a new rocker lever adjusting screw, figure 3-149, or
with a % in. check ball which should "blue in" 80 percent
of seat area; spherical inside diameter new is
0.4995/0.5005 in.
(4) Extreme wear on either end of push tube
will result in loss of lubricating oil pressure and may
interfere with correct injector and valve adjustment.
(5) Check push tubes to see if they are bent
Figure 3-145. Torquing cylinder head capscrews.
(out-of-round). Tubes should not be out-of-round more
than 0.025 in. when located in centers of socket and
3. Check each of the remaining sets of
ball. Push tubes that are bent have usually had the
levers in the same manner as 1. and 2. above to
adjusting screws over-torqued.
determine which injector lever(s) must be machined and
(6) Push tubes with worn balls should never
the amount of stock that must be removed from each
be installed in new tappet sockets.
side of lever(s).
(7) Push tubes which have become filled
4. Clean machined lever(s) thoroughly to
with lubricating oil should be drained by drilling a 1/16
prevent damage to other engine parts.
inch hole in the tube 1 inch above where tube contacts
(2) Cylinder head cover.
ball insert.
(a) Assemble new gasket, washers and
d. Installation. Install push tubes in correct tappet
capscrews to cylinder head cover.
sockets.
(b) Install crankcase breather on cylinder
head cover.
(c) Mount cover on engine, figure 3-146.
Tighten holddown capscrews.
Figure 3-147. Push rod removal and installation.
3-31. Springs, Guides, Locks and Valves
Replacement and Repair
Figure 3-146. Cylinder head cover installation.
a. Removal.
Remove valves, locks, spring
guides and springs.
Use ST448 valve spring
3-30. Push Rods Replacement
compressor to compress valve springs.
a. General Push rods are used to transmit
b. Inspection
camshaft action to injectors and valves.
(1) Valves. Inspect, then discard if:
b. Removal Lift all push rods from tappet sockets.
(a) Heads are cupped, cracked, pitted or
worn too thin to regrind within limits. Check valve head
Note. Each cylinder has an intake, exhaust and
injector push rod.
3-53
