Intake Manifold Assembly
Intake Manifold Assembly - 4.6LMaterial:
Disassembly
1. Remove the 4 bolts and the fuel rail.
2. Remove the 8 fuel injectors from the fuel rail.
3. Remove and discard the 2 O-ring seals from each fuel injector.
4. Remove the 8 lower intake manifold bolts.
5. Separate the upper and lower intake manifolds and discard the lower intake manifold gasket.
6. CAUTION: If the engine has been internally damaged and metal or other foreign material has entered the manifold, it is recommended that the manifold be discarded.
NOTE: If there is no residual gasket material present, metal surface prep can be used to clean and prepare the sealing surfaces.
Inspect all external and internal surfaces of the upper intake manifold.
^ Inspect for cracks or other damage.
^ Inspect for foreign material inside of the manifold.
^ Clean the upper intake manifold sealing surfaces with silicone gasket remover and metal surface prep. Follow the directions on the packaging.
7. Allow the upper and lower intake manifolds to dry completely.
Assembly
1. Position a new lower intake manifold gasket and the upper intake manifold on the lower intake manifold and loosely install the bolts.
2. Tighten the bolts in 2 stages using the sequence shown.
^ Stage 1: Tighten to 2 Nm (18 inch lbs.).
^ Stage 2: Tighten to 10 Nm (89 inch lbs.).
3. NOTE: Lubricate the new O-ring seals with clean engine oil prior to installation.
Using new O-ring seals, install the fuel injectors into the fuel rail.
4. Position the fuel rail and install the 4 bolts.
^ Tighten to 10 Nm (89 inch lbs.).