90. Intake Manifold Installation
Intake Manifold Installation (G)Intake Manifold
1. Install the new gaskets onto the cylinder heads.
2. Install the intake manifolds.
Notice: Refer to Fastener Notice in Service Precautions.
1. Apply teflon sealer GM P/N 1236004 on the threads of the studs that are second to the end on both intake manifolds. There are a total of four studs that require the teflon sealer.
2. Apply threadlocker GM P/N 12345493 on the threads of the remaining studs.
3. Install the intake manifold studs.
^ Tighten the intake manifold studs, (from the center out) to 42 Nm (31 ft. lbs.).
4. Install the miscellaneous brackets and fuel line brackets on the intake studs.
5. Install the nuts for the brackets.
^ Tighten the bracket nuts to 23 Nm (17 ft. lbs.).
6. Install the center intake manifold gaskets on the intake manifolds.
7. Install the O-ring onto the turbocharger inlet housing.
8. Lubricate the O-ring lightly with engine oil.
9. Install the center intake manifold onto the right and the left intake manifolds and on the turbocharger inlet housing.
10. Install the bolts to the center intake manifold.
^ Tighten the center intake manifold bolts to 23 Nm (17 ft. lbs.).
Thermostat Housing
1. Install the thermostat bypass connector.
2. Install the thermostat bypass hose and clamps.
3. Install the lower thermostat housing and gaskets.
Notice: Refer to Fastener Notice in Service Precautions.
4. Install the bolts and stud/nut.
^ Tighten the bolts and the stud/nut to 42 Nm (31 ft. lbs.).
5. Install the Engine Coolant Temperature (ECT) sensor.
^ Tighten the ECT to 23 Nm (17 ft. lbs.).
6. Install the fuel bleed valve and stud/nut.
^ Tighten the stud/nut to 41 Nm (31 ft. lbs.).
7. Install the seals (3) onto the thermostats (2).
^ The seals have a split, inner edge, which installs over the flange on the thermostats.
^ The seals have a bead on the surface that faces the water outlet.
8. Install the thermostats into the lower thermostat housing.
9. Install the upper thermostat housing.
10. Install the upper thermostat bolts/studs.
^ Tighten the upper thermostat bolts/studs to 47 Nm (35 ft. lbs.).