Lower Intake Manifold Installation

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

Fig 1: View Of Lower Intake Manifold

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: All gasket-mating surfaces need to be free of oil, and foreign material. Use GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean surfaces.

Install the lower intake manifold seals.
With the seals in place apply a small drop 8-10 mm (0.31-0.39 in) of RTV sealer GM P/N 12346141 (Canadian P/N 10953433) or equivalent to the 4 corners of the intake manifold to block joint (1).
Install the lower intake manifold.

Fig 2: Lower Intake Manifold Bolt Tightening Sequence

Courtesy of GENERAL MOTORS CORP.

NOTE: Maximum gasket performance is achieved when using new fasteners, which contain a thread-locking patch. Failure to replace the fasteners MAY reduce gasket sealing capability.

NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

IMPORTANT: All lower intake manifold bolts need to be clean and free of any foreign material.

IMPORTANT: Manufacturer recommends the center bolts be fully torqued before the diagonal bolts to assure proper seal ability.

IMPORTANT: Lower intake manifold bolts in location 6 and 7 should be torqued to specification using a crows foot type tool.

Install the NEW lower intake manifold bolts.
Tighten:
1. Tighten the lower intake manifold bolts (1, 2, 3, 4) in sequence to 7 N.m (62 lb in) on the first pass.
2. Tighten the lower intake manifold bolts (5, 6, 7, 8) in sequence to 13 N.m (115 lb in) on the first pass.
3. Tighten the lower intake manifold bolts (1, 2, 3, 4) in sequence to 13 N.m (115 lb in) on the final pass.
4. Tighten the lower intake manifold bolts (5, 6, 7, 8) in sequence to 25 N.m (18 lb ft) on the final pass.

Fig 3: View Of Heater Inlet Pipe & Nut

Courtesy of GENERAL MOTORS CORP.

Install the heater outlet pipe adapter hose and clamp to the thermostat bypass pipe.
Install the heater inlet pipe.
Install the heater inlet pipe nut.
Tighten: Tighten the heater inlet pipe nut to 25 N.m (18 lb ft).

Fig 4: View Of Fuel Injector Rail Assembly

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Do not use the fuel injector O-ring seals twice. Install NEW fuel injector O-ring seals during assembly.

IMPORTANT: Do not press on the fuel pressure regulator valve when installing the fuel injector rail assembly.

Install the fuel injector rail assembly.
1. Install the fuel injector O-rings, lubricate using GM P/N 12345616, (Canadian P/N 993182) or equivalent.
2. Install the injector nozzles into the lower intake manifold injector bores.
3. Press on the injector rail using the palms of both hands until the injectors are fully seated.
Install the fuel injector rail bolts.
Tighten: Tighten the fuel injector rail bolts to 10 N.m (89 lb in).
Install the coolant temperature sensor and camshaft position sensor connectors.