TM 5-3810-300-24&P-3
Valve Operating Mechanism 1.2.1
1. Assemble the serrated lower spring seat (Fig. 6),
3. Lubricate the valve bridge guides (four-valve
spring, upper spring seat and lock nut on the push rod.
cylinder head) with sulphurized oil (E.P. type) and
position the valve bridges in place on the guides. Refer
2. With the spring retainer in place in the cylinder
head, slide the push rod assembly in position from the
adjust the valve bridges.
bottom of the head.
4.
If removed, install the fuel injectors.
3. Note the oil hole in the bottom of the cam follower.
With the oil hole directed away from the exhaust valves
5. Apply clean engine oil to the rocker arm shaft and
(Fig. 10), slide the cam follower in position from the
slide the shaft through the rocker arms. Then place a
bottom of the head.
bracket over each end of the shaft, with the finished face
of the bracket next to the rocker arm.
4. Attach the follower guide to the cylinder head to
hold the group of three cam followers in place. Check to
6. Insert the rocker arm bracket bolts through the
make sure there is clearance between the cam followers
brackets and the shaft. Tighten the bolts to the specified
and the cam follower guide. Tighten the guide bolts to
12-15 Ib-ft (16-20 Nm) torque (cast iron head) or 7-9 Ib-ft
(0.8-1.02 Nm) torque (aluminum head).
7. Align the fuel pipes and connect them to the
injectors and fuel connectors. Tighten the fuel pipe nuts
to 12-15 lb-ft (16-20 Nm) torque using socket J 8932-01.
Install Rocker Arms and Shaft
CAUTION: Do not bend the fuel pipes and do not
Note that the injector rocker arm (center arm of the
exceed the specified torque. Excessive tightening
group) is slightly different from the exhaust valve rocker
will twist or fracture the flared ends of the fuel
arms; the boss for the shaft on the left and right-hand
pipes and result in leaks. Lubricating oil diluted by
valve rocker arms is longer on one side. The extended
fuel oil can cause serious damage to the engine
boss of each valve rocker arm must face toward the
injector rocker arm.
8.
Fill the cooling system.
1. Thread each rocker arm on its push rod until the
end of the push rod is flush with or above the inner side
9. Adjust the exhaust valve clearance (Section 14.1)
of the clevis yoke. This will provide sufficient initial
and time the injectors (Section 14.2).
clearance between the exhaust valve and the piston
when the crankshaft is turned during the valve clearance
10. If necessary, perform an engine tune-up.
adjustment procedure.
2. If removed, install the cylinder head on the engine
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