Timing Belt Installation

WARNING: This page is about a different variant/trim than selected.

Special Tools

EN-955-A V-Belt and Timing Tensioner Locking Pin
EN-45059-A Angle Meter
EN-52455 Open End Wrench
EN-52457 Camshaft Locking Tool
EN-52458 VCP Locking Tool
EN-52476 Flywheel Lock Tool

Equivalent regional tools: Special Tools

Courtesy of GENERAL MOTORS COMPANY

NOTE:
Ensure the EN-52476 Flywheel Lock Tool (1) is properly assembled, and the timing pin plunger (3) is retracted. When using the EN-52476 Flywheel Lock Tool as an timing device, adjust the pawl armature (4) so the pawl is not engaging the teeth once installed.

EN-52476 Flywheel Lock Tool (1) - Install
Bolt (2) - Install and tighten [2x]
Courtesy of GENERAL MOTORS COMPANY

Crankshaft Balancer Bolt (1) - Install

NOTE:

The engine timing is located 118.14 degrees after top dead center.

Engage the EN-52476 Flywheel Lock Tool timing pin plunger (2).

NOTE:

Once there is resistance, do NOT turn the crankshaft further.

Adjust the engine to the engine timing position. Use the crankshaft balancer bolt to slowly rotate the crankshaft in direction of engine rotation until the pin (3) of the EN-52476 Flywheel Lock Tool snaps automatically into the hole (4) of the automatic transmission flex plate or the engine flywheel.
Adjust the pawl armature (5) on the EN-52476 Flywheel Lock Tool so the pawl is not engaging the teeth.
Courtesy of GENERAL MOTORS COMPANY

Adjust the intake camshaft so that the valves (3) of the 3rd cylinder are closed and the 2 flats (2) stand in vertical position. Use the EN-52455 Open End Wrench (1).
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The EN-52457 Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457 Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification intake (2) for use on the intake camshaft.

EN-52457-2 locking tool (5) @ Intake Camshaft - Install
Bolt (3, 4) - Install and tighten
Courtesy of GENERAL MOTORS COMPANY

Adjust the exhaust camshaft so that the valves (3) of the 3rd cylinder are closed and the 2 flats (2) stand in vertical position. Use the EN-52455 Open End Wrench (1)
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The EN-52457 Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457 Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification exhaust (2) for use on the exhaust camshaft.

EN-52457-1 locking tool (5) @ Exhaust Camshaft - Install
Bolt (3, 4) - Install and tighten [2x]
Courtesy of GENERAL MOTORS COMPANY

Install the timing belt (1) downwards.
Crankshaft Front Seal (2) - Install NEW
Crankshaft Sprocket (3) - Install
Crankshaft Balancer Bolt (4) - Install
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The front of the camshaft sprockets is recognizable by the pin (2).

Camshaft Sprocket (1) - Install [2x]
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NOTE:
The sprocket bolts must be tightened enough to remove axial play between the sprocket and cam. The bolts must be loose enough to allow the sprocket to turn independently of camshafts.

Loosely install the 2 NEW camshaft sprocket actuator valve bolts (1).
Courtesy of GENERAL MOTORS COMPANY

Timing Belt Tensioner (1) - Install
Timing Belt Tensioner Bolt (2) - Loosely install
Timing Belt Idler Pulley (4) - Install

CAUTION:

Fastener Caution

Timing Belt Idler Pulley Bolt (3) - Install and tighten 36 N.m (27 lb ft)
Courtesy of GENERAL MOTORS COMPANY

EN-955-10-A pin (2) - Remove

NOTE:

10 degrees past nominal position can be verified when the hole in the mobile index pointer is no longer visible behind the gap of the front plate.

Rotate the timing belt tensioner clockwise to tension the timing belt tensioner (1) to the nominal position (4), and an additional 10 degrees (5).
Timing Belt Tensioner Bolt (3) - Tighten 36 N.m (27 lb ft)
Courtesy of GENERAL MOTORS COMPANY

Bolt (2) - Loosen
Slide the EN-52458 VCP Locking Tool (1) apart.
EN-52458 VCP Locking Tool (1) - Install
Bolt (3) - Install and tighten [4x] 6 N.m (53 lb in)
Bolt (2) - Tighten
Courtesy of GENERAL MOTORS COMPANY

Install the EN-52458-3 locking tool (2) to the holes in the intake camshaft sprocket.
Check that the EN-52458-3 locking tool (2) sits correctly in the hole of the camshaft sprocket.

NOTE:

A second technician is required.

Tighten the EN-52458-3 locking tool (2) to 20 N.m (15 lb ft). Rotate the EN-52458-3 locking tool counter-clockwise.
While holding the EN-52458-3 locking tool to 20 N.m (15 lb ft), tighten the bolt (3) to 20 N.m (15 lb ft).

CAUTION:

Torque-to-Yield Fastener Warning

Camshaft Sprocket Actuator Valve Bolt (1) @ Intake Camshaft - Tighten
1. First Pass: 50 N.m (37 lb ft)
2. Final Pass: 28 degrees, use the EN-45059 meter
Courtesy of GENERAL MOTORS COMPANY

Install the EN-52458-3 locking tool (3) to the holes in the exhaust camshaft sprocket.
Check that the EN-52458-3 locking tool (3) sits correctly in the hole of the camshaft sprocket.

NOTE:

A second technician is required.

Tighten the EN-52458-3 locking tool (3) to 20 N.m (15 lb ft). Rotate the EN-52458-3 locking tool counter-clockwise.
While holding the EN-52458-3 locking tool to 20 N.m (15 lb ft), tighten the bolt (2) to 20 N.m (15 lb ft).

CAUTION:

Torque-to-Yield Fastener Warning

Camshaft Sprocket Actuator Valve Bolt (1) @ Exhaust Camshaft - Tighten
1. First Pass: 50 N.m (37 lb ft)
2. Final Pass: 28 degrees, use the EN-45059 meter
Courtesy of GENERAL MOTORS COMPANY

Bolt (3) - Remove [4x]
EN-52458 locking tool (1) - Remove
Courtesy of GENERAL MOTORS COMPANY

Bolt (3, 4) - Remove [2x]
EN-52457-1 locking tool (5) - Remove
Courtesy of GENERAL MOTORS COMPANY

Bolt (3, 4) - Remove
EN-52457-2 locking tool (5) - Remove
Courtesy of GENERAL MOTORS COMPANY

Turn the crankshaft 720 degrees in the direction of engine rotation by the crankshaft balancer bolt (1) until the pin (2) of the EN-52476 lock tool snaps automatically into the hole (3) of the automatic transmission flex plate or the engine flywheel.
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The nominal position of the timing belt tensioner is when the mobile index pointer (2) sits in the middle between the gap of the front plate (3). A tolerance is given when half of the hole (4) is visible (+/- 5 degrees).

Check that the timing belt tensioner (1) is in the nominal position.
If not, repeat the step to adjust the tensioner.
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The EN-52457 Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457 Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification intake (2) for use on the intake camshaft.

EN-52457-2 locking tool (5) @ Intake Camshaft - Install
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The EN-52457 Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457 Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification exhaust (2) for use on the exhaust camshaft.

EN-52457-2 locking tool (5) - Install
If the EN-52457 Camshaft Locking Tool can be installed, the engine timing is properly adjusted.
If the EN-52457 Camshaft Locking Tool can not be installed, repeat the steps to set the engine timing.
EN-52457 Camshaft Locking Tool - Remove
Courtesy of GENERAL MOTORS COMPANY

Crankshaft Balancer Bolt (1) - Remove
Courtesy of GENERAL MOTORS COMPANY

Bolt (2) - Remove [2x]
EN-52476 Flywheel Locking Tool (1) - Remove