TRUCK SERVICE MANUAL
Fig. 5 3 6. F5241. Drilling spring pack housing with ST1175
1. Spring pack housing guard
2. Tetraseal
3. Spring pack housing plug
d. Torque the other cover capscrews to 90/95 inch
pounds. The twistoff capscrews will twist off at about 105 inch
pounds.
Fig. 537. F5290. Spring Pack Housing Guard and Tetraseal
Installed
e. To remove the twistoff capscrew, use an electricarc to
weld a nut to the top of the capscrew.
CAUTION
Weld the nut in the thread area.
Do not overheat the
aluminum covers.
f. The heat from the weld will weaken the retaining
compound; therefore, disassemble immediately while hot.
g. Due to the hardness of the twistoff capscrews; do not
attempt to drill them out.
7. The spring pack guard is designed to protect the
spring pack from tampering. The spring pack guard mounts
on the rear of the spring pack housing. Fig. 537. The
Tetraseal is to be fitted over the shoulder at the small end of
the guard.
Install as follows:
Fig. 538. F5291. Throttle Shaft Snap Ring Installed
a. Remove spring pack cover and discard gasket.
Install spring pack guard and Tetraseal.
b. Install spring pack cover with a new gasket leaving
the mounting hold for break away seal screw open.
Note: When using a spring pack cover having a plug, saw off
plug flush with cover.
8. Remove standard snap ring securing throttle shaft
cover and replacing with snap ring, Part No. 21461, Fig 5-38.
551