ADAPTER 7S8768 - Caterpillar

CONFIDENTIAL TIBU3816-00
TECHNICAL INFORMATION BULLETIN April 02, 2003
Engine C10 (MBJ1-1629)
C12 (MBL1-3973)
Component Code: 1940SUBJECT: Under-torqued Nuts on 219-0329 Modulating Valve Assembly (Smart Wastegate)
PROBLEM:
On the above-listed engines, there have been reports of under-torqued nuts on the 219-0329 Modulating Valve Assembly (Smart Wastegate). Low torque on modulator valve assembly nuts can cause low engine power and/or low engine boost.
SOLUTION:
If a C10 or C12 engine comes in with a low power complaint or a low boost complaint, check the torques on the modulator valve assembly nuts. The large jam nut should be torqued to 50 +/- 5 Nm (37 +/- 4 lb ft). The smaller bottom nut should be torqued to 13 +/- 1.5 Nm (10 +/- 1 lb ft). If low torque is the root cause of the complaint, report the repair using a PD code of 81.
Illustration 1. 219-0329 Modulating Valve Assembly (Smart Wastegate).
Smaller Bottom Nut ? Torque to 13 +/- 1.5 Nm (10 +/- 1 lb ft).
Large Jam Nut - Torque to 50 +/- 5 Nm (37 +/- 4 lb ft).
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