Timing Chain Idler Sprocket Removal

Special Tools 

EN-51141  Intermediate Drive Gear Fixing Tool

For equivalent regional tools, refer to Special Tools .

Fig 1: Crankshaft Sprocket Marks
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Depending on the crankshaft, two different marks (1) and (3) or none (2) can be located on the crankshaft sprocket.

1. Mark the crankshaft sprocket align with the timing chain idler sprocket if there is no mark.
Fig 2: Intermediate Drive Gear Fixing Tool And Timing Chain Idler Sprocket
Courtesy of GENERAL MOTORS COMPANY
2. Install the EN-51141  fixing tool (1) to the timing chain idler sprocket (2).
Fig 3: Timing Chain Idler Sprocket, Bolts, Bearing Plate And Gear Shaft Distributor
Courtesy of GENERAL MOTORS COMPANY
3. Remove the 3 timing chain idler sprocket bolts (1).
4. Remove the timing chain idler sprocket bearing plate (2).
NOTE:

If the timing chain idler sprocket is reused, do not remove the EN-51141  fixing tool (5).

5. Remove the timing chain idler sprocket (4).
6. Remove the gear shaft distributor (3).