Push rods and cam followers

TM 10-3930-634-34

(e) Ream the injector tube for injector nut and

an injector for a gage (fig. 3-86), continue the reaming

spray tip with the cylinder head right side up and the

operation until the shoulder of the spray tip is either

injector tube free from dirt as illustrated in figure

flush or extends a maximum of 0.015 inch below the

3-85. Withdraw reamer frequently for removal of

fire deck of cylinder head as illustrated in figure 3-86.

chips.

(6) Push rods and cam followers (cylinder head re-

(f) With the cylinder head bottom side up, insert

moved).

pilot cutting tool into small hole of injector tube. Then,

(a) Install the push rod spring retainers (24, fig.

use a socket and speed handle. Remove excess stock so

3-63) in the cylinder head.

that the lower end of the injector tube is flush to 0.005

(b) Install lower spring seat (27), spring (26) and

inch below the finished surface of the cylinder head.

upper spring seat (25) on the push rod (28). Then, in

(g) Ream the bevel seat in the injector tube as

stall the assembled push rod into the cylinder head in

follows:

the proper bore.

1. Install the injector assembly in the cylinder

(c) Screw the push rod locknut (23) on each push

head to determine the amount of stock that must be re-

rod as far as possible; then, screw the push rod into the

moved from the bevel seat of the injector tube. Note

rocker arm clevis until the end of the rod is flush with

the relationship between the numbered surface of the

or above the inner side of the clevis.

spray tip to the fire deck of the cylinder head as illus-

(d) Place the cam followers in a screen type

trated in figure 3-86.

basket and immerse the basket in a container of light-

2. With the first reaming operation com-

weight engine oil (heated to 100 to 1250F.) for at

pleted and the injector tube spot faced, wash interior

least one hour before installation. Rotate the cam fol-

of injector tube with cleaning solvent (Fed Spec

lower rollers during the soaking period to aid in

P-D-680) and dry with compressed air. Then, perform

purging any air from the bushing roller area.

the second reaming operation.

NOTE

(e) Note the oil hole in the bottom of the cam

follower. With this hole pointing away from the ex-

Service replacement injectors tubes are semi-

haust valve guide, slide the cam followers into position

finished and have a narrow land machined at

in cylinder head (fig. 3-69).

the beveled seat to reduce reaming time. Ex-

treme care must be exercised while reaming

(f) Install the cam follower guide as illustrated

in figure 3-69. Tighten cam follower guide bolts to

the bevel seat to prevent reamer from cutting

12-15 lb-ft torque.

too deeply and possibly through the thin wall

(g) Check to make sure there is at least 0.005

of the tube.

inch clearance between the cam follower legs and the

3. Ream the injector tube for the injector nut

follower guide as illustrated in figure 3-88.

as illustrated in figure 3-87. Make trial cut by turning

(h) If the clearance is insufficient, loosen guide

reamer without applying downward force. Remove

bolts slightly and tap each corner of the guide with a

reamer, blow out chips, and look at the bevel seat to

brass rod (fig. 3-89). Then, retighten bolts and recheck

see what portion of the seat has been cut.

the clearance.

4. Proceed carefully with the reaming opera-

(i) Install the fuel injectors (para 3-18).

tion, withdrawing the reamer occasionally to observe

progress.

(j) Install the rocker arms (para 3-23).

3-60