Engine-Support Fasteners Check (Noise Emission Control)

cen mm 01.04.000

Front and rear engine supports for vehicles built from January 2007 require no periodic maintenance. Mounts should be inspected when the engine is removed for service. For vehicles manufactured prior to January 2007, perform the following check.

Check the rear engine-support fasteners (see Fig., Ref. 4) for tightness. Tighten the 3/4-inch fasteners 215 to 265 lbf·ft (292 to 359 N·m).

Check the front engine-support fasteners for tightness. Tighten the 5/8-inch fasteners 125 lbf·ft (170 N·m).

Note: At engine overhaul, and whenever the engine has been removed, inspect the lower and upper isolators (see Fig., Refs. 1 and 6), and replace them if they are worn; this applies to both the front and rear isolators. See of the Century Class Trucks Workshop Manual for procedures.

  1. Lower Isolator

  2. Engine-Support Washer

  3. 3/4–10 Capscrew

  4. 3/4–10 Hexnut

  5. Engine Mount

  6. Upper Isolator

Fig. 1, Rear Engine Mount Isolators and Fasteners

Note:
Parent topic: Engine
Document Number: 0000121792
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-06-04