Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 455 (ENGINE MECHANICAL)REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSCAMSHAFT INSTALLATION

1999 GMC Forward Control 5.7 R, Automatic

Camshaft Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Camshaft Installation

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Coat the camshaft journals with clean engine oil.
Coat the camshaft lobes with prelube GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
Install the camshaft using the following procedure:
1. 3.1. Install a large screwdriver into the camshaft bolt hole for support. Do not damage the threads.
2. 3.2. Rotate the camshaft while installing the camshaft into the camshaft bearings.
Fig 1: Installing Camshaft
Courtesy of GENERAL MOTORS CORP.
Install the camshaft thrust plate.
Install the camshaft thrust plate screws.
Tighten Tighten the camshaft thrust plate screws to 10N.m (89lb in).

Fig 2: Installing Camshaft Thrust Plate
Courtesy of GENERAL MOTORS CORP.
Install the camshaft position sensor.
Install the camshaft position sensor bolt.
Tighten Tighten the camshaft position sensor bolt to 10N.m (89 lb in).

Fig 3: Installing Camshaft Position Sensor
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.