C15 Engine for Combat and Tactical Vehicles Caterpillar

Illustration 1	g01624640
Typical example Right side view of engine (2) High-pressure turbocharger (7) Low-pressure turbocharger

Illustration 2	g01502594
Tightening sequence for flange of the turbocharger

Use the following procedure to tighten the locknuts for the flange of the turbocharger:

Note: Apply 4C-5599 Anti-Seize Compound to the washer face and threads of the locknuts before assembly.

1. Tighten locknut 1 through locknut 4 in a numerical sequence to 55 ± 5 N·m (41 ± 4 lb ft). Refer to 2.

2. Again, tighten locknut 1 through locknut 4 in a numerical sequence to 55 ± 5 N·m (41 ± 4 lb ft).

(1) Opening pressure of the wastegate at 1.00 mm (0.039 inch) lift ... 196.4 kPa (28 psi)

(3) Torque for the bolt ... 6 ± 1 N·m (55 ± 9 lb in)

(4) Torque for the elbow ... 12.0 ± 1.5 N·m (105 ± 13 lb in)

Use the following procedure to tighten the clamp assembly (5) for the 251-4842 Turbocharger Gp :

1. Tighten the clamp assembly to 18 N·m (160 lb in).

2. Loosen the clamp assembly to 6 N·m (55 lb in).

3. Again, tighten the clamp assembly to 13.5 ± 1.0 N·m (120 ± 9 lb in).

(6) Torque for the compressor clamp assembly ... 15.9 ± 1.0 N·m (140 ± 9 lb in)

Use the following procedure to tighten the clamp assembly (5) for the 251-4840 Turbocharger Gp and 251-4841 Turbocharger Gp :

1. Tighten the clamp assembly to 18 N·m (160 lb in).

2. Loosen the clamp assembly to 6 N·m (55 lb in).

3. Again, tighten the clamp assembly to 15.9 ± 1 N·m (141 ± 9 lb in).

(6) Torque for the compressor clamp assembly ... 15.9 ± 1.0 N·m (140 ± 9 lb in)