HEAD 1747432 - Caterpillar

Illustration 1 g03025157
Left side view
Table 1
Specification for 390-4255 Exhaust Bypass
Item Qty Part Specification description
1 4 168-7800 Locknut Clean the stud, the locknut, and the base of the locknut prior to assembly.
Before assembly, apply 2P-2333 High Temperature Sealer to the threads and the flange area of the locknut.
Use the following procedure to tighten the locknut:
1. Tighten two diagonal locknuts to 25 6 N m (221 53 lb in).
2. Tighten the remaining locknuts to 25 6 N m (221 53 lb in).
3. Again, torque all four locknuts to 47 9 N m (35 7 lb ft).
Illustration 2 g03025158
Table 2
Specification for 390-4255 Exhaust Bypass
Item Qty Part Specification description
2 1 6V-8186 Full Nut Torque to 12.5 1.0 N m (110.6 8.9 lb in).
3 1 259-1434 Spring Free length is 127.0 mm (5.00 inch).
4 1 259-1435 Spring Free length is 127.0 mm (5.00 inch).
5 1 6V-8801 Nut Torque to 14 3 N m (124 27 lb in).
6 1 343-9109 Setscrew Before assembly, apply Loctite C5A Copper anti-seize to the threads and the bearing surfaces.
7 5 7C-9721 Screw Torque to 6.5 1.0 N m (57.5 8.9 lb in).