Lower Intake Manifold Installation (L26)

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Lower Intake Manifold sealing Points

Courtesy of GENERAL MOTORS CORP.

Clean the lower intake manifold sealing surface using GM P/N 12346139 (Canadian P/N 10953463) or equivalent prior to installing any seals or gaskets.
Install the lower intake manifold gaskets and seals.
With gaskets and seals in place, apply a small drop 8-10 mm (0.31-0.39 in) of RTV sealer GM P/N 12378521 (Canadian P/N 88901148) or equivalent, to the 4 corners of the intake manifold to block joints (1).
Install the lower intake manifold.
Apply threadlocker 272 GM P/N 12345493, (Canadian P/N 10953488) or the equivalent to the bolt threads.

Fig 2: Identifying Lower Intake Manifold Bolt Tightening Sequence

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE .

Install the lower intake manifold bolts.
Tighten: Tighten the lower intake manifold bolts in sequence to 15 N.m (11 lb ft).

Fig 3: Identifying Generator Brace Bracket

Courtesy of GENERAL MOTORS CORP.

Install the generator brace bracket (571).
Install the generator brace bracket bolts (569, 570).
Tighten: Tighten the generator brace bracket bolts to 50 N.m (37 lb ft).