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"DIY" Do it yourself/how to Post your "DIY/how to" on here for 7TH Gen. All posts are subject to review and should only be used as a reference and NOT as a substitute for professional repair/service

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Old 02-24-2010, 06:47 PM   #1 (permalink)
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LIM (Gasket) replacement

Lower Intake Manifold Replacement
Removal Procedure
Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .
Remove the generator brace. Refer to Generator Brace Replacement in Engine Electrical.



Remove the drive belt tensioner with the mounting bracket and the heater water bypass inlet pipe. Refer to Drive Belt Tensioner Replacement .



Remove the exhaust gas recirculation (EGR) outlet pipe bolt from the lower intake manifold.



Remove the radiator inlet hose from the water outlet housing. Refer to Radiator Inlet Hose Replacement in Engine Cooling.



Disconnect the engine coolant temperature (ECT) sensor electrical connector.
Remove the right upper engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .



Remove the generator brace bracket bolts.
Remove the generator brace bracket.



Remove the lower intake manifold bolts.
Remove the lower intake manifold.



Remove the lower intake manifold seals.



Remove the lower intake manifold gaskets.



If replacing the lower intake manifold, remove the water outlet housing bolt and stud, the water outlet housing, the gasket and the thermostat.
If replacing the lower intake manifold, remove the ECT sensor.
Inspect the flatness of inlet flanges.
Clean the intake manifold mating surfaces.
Clean the intake manifold bolts and bolt holes of adhesive compound.
Installation Procedure
Notice: Refer to Fastener Notice in the Preface section.

If removed, install the ECT sensor.
Tighten
Tighten the ECT sensor to 25 N·m (18 lb ft).





If removed, install the thermostat, the gasket, and the water outlet housing.
Install the water outlet housing bolt and the stud.
Tighten
Tighten the bolt and stud to 27 N·m (20 lb ft).





Install the lower intake manifold gaskets.



Apply sealer GM P/N 12346286 (Canadian P/N 10953472) or equivalent to the ends of the intake manifold seals.
Install the lower intake manifold seals.



Install the lower intake manifold.



Install the lower intake manifold bolts (1-12). Apply thread lock compound GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the two hidden bolts and ensure they are installed.
Tighten
Tighten the lower intake manifold bolts in sequence to 15 N·m (11 lb ft).





Install the generator brace bracket.
Install the generator brace bracket bolts.
Tighten
Tighten the bolts to 50 N·m (37 lb ft).

Install the right upper engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .



Connect the ECT sensor electrical connector.



Install the radiator inlet hose to the water outlet housing. Refer to Radiator Inlet Hose Replacement in Engine Cooling.



Install the EGR outlet pipe to the lower intake manifold.
Install the EGR outlet pipe bolt to the lower intake manifold.
Tighten
Tighten the bolt to 29 N·m (21 lb ft).





Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
Install the generator brace. Refer to Generator Brace Replacement in Engine Electrical.
Install the upper intake manifold. Refer to Upper Intake Manifold Replacement .
Inspect for leaks.

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Old 07-18-2012, 04:40 PM   #2 (permalink)
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Did this come from a manual somewhere? Is there a more detailed explanation with torque specs for all the stuff that has to get re-installed?
Got any pics of the gasket placement and installation and where to put the sealant/rtv?

Thanks for posting this in the first place!
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Old 08-20-2012, 12:27 PM   #3 (permalink)
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Take a look at Stephens head gasket procedure at the top of the page, it's all the same, with pics, just goes a little further into the motor.

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