Fuel injector tubes

TM 10-3930-634-34

ground and checked, thoroughly clean the cylinder

head before installing the valves.

(k) Apply a light coat of engine oil on the valve

compressor tool and secure each valve in position with

stems (36, fig. 3-63) and install the valves in the

two spring locks (33, fig. 3-63). Release tool and in-

cylinder head. If reconditioned valves are used, install

stall the remaining exhaust valves in a similar man-

them in the same port from which they were removed.

ner.

(l) Hold the valves in place with masking tape

(n) Refer to figure 3-81 and check the position

and turn the cylinder head right side up on the work

of the exhaust valves after installation.

bench. Place a board under the head to support the

(5) Fuel injector tubes.

valves.

(a) Thoroughly clean the injector tube hole in

(m) Install spring seat, valve spring (35, fig.

the cylinder head; remove all dirt, burrs, or foreign

3-63), and spring cap (34). Thread the valve spring

material that may prevent the tube from seating at the

compressor into the rocker shaft bolt holes in the

lower end or sealing at the upper end.

cylinder head as illustrated in figure 3-70. Depress the

(b) Install a new injector tube sealing ring in the

injector tube counterbore. Use the injector tube instal-

lation tool and install the injector tube in the cylinder

head as illustrated in figure 3-83.

(c) With the injector tube properly positioned in

the cylinder head, flare the lower end of the tube as

follows:

1 Turn the cylinder head bottom side up. Re-

move the tool pilot and thread upsetting die into the

tapped end of the installation tool as illustrated in

figure 3-84.

2 Use a socket and torque wrench as illus-

trated in figure 3-84 and apply approximately 30 lb-ft

torque.

3 Remove the tool and ream the injector.

(d) After the injector tube has been installed in

the cylinder head, it must be finished in three opera-

tions. First, hand reamed, to receive the injector body

nut and spray tip; second, spot faced to remove excess

stock at lower end of injector tube; and third, hand

reamed to provide a good seating surface for lower end

of injector nut.

3-59