2013/02/04 Caterpillar

Off-Highway Truck/Tractor:

793FSeries AC (S/N: EMD1-UP)

793F (S/N: SND1-UP; SSP1-UP; RBT1-UP)

795FSeries AC (S/N: ERM1-UP)

797B (S/N: JSM1-UP)

797F (S/N: LAJ1-UP; WSP1-UP)

Service Magazine SEPD1766, 08 April 2014, "A New Torque Specification Is Used for the V-Band Clamp of the Turbocharger on Certain 3500 and C175 Off-Highway Truck Engines". The original article has been revised to remove 3500 from title.

Illustration 1	g03653737
(A) 20 degrees (1) Turbine housing clamp

The alignment of the v-band clamp cannot exceed 20 degrees from the inlet port of the turbine housing. Position the clamp in order to ensure no contact between the housing and t-bolt.

Illustration 2	g03344275
(2) Nut

Use the following torque procedure in order to secure the nut of the clamp on the turbocharger

Note: Lubricate threads before assembly with 4C-5599 Anti-Seize Compound or equivalent.

1. Tighten nut (2) to 20 N·m (15 lb ft).

2. Tap lightly around the clamp.

3. Tighten the nut again to 30 ± 2 N·m (22 ± 1.5 lb ft)

4. Tap lightly around the clamp again.

5. Tighten the nut again to 30 ± 2 N·m (22 ± 1.5 lb ft)

   Note: Tighten the nut again after running the engine to operating temperature. Allow the engine to cool before tightening the nut again. The clamp is a one time use only part. Do not retighten a loose clamp, replace.

Table 1

Turbocharger Part Number	Serial Number Prefix
327-7738	RBT, SND, SSP
343-5684	SSP
362-1621	ERM, JSM, LAJ, WSP, EMD
362-1622	JSM
442-0113	JSM, ERM, LAJ, WSP, EMD