Chevrolet Silverado / GMC Sierra. Service manual — part 209

2. Install the lower intake manifold gasket onto the cylinder head.

Use the gasket locator pins in order to properly seat the lower intake manifold gasket on the
cylinder head.

Fig. 701: Applying Adhesive To Front Top Of Engine Block
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The lower intake manifold gasket must be installed while the

adhesive is still wet to the touch.

IMPORTANT: The lower intake manifold must be installed and the

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

3. Apply a 5 mm (0.197 in) bead of adhesive GM P/N 12346141 (Canadian P/N 10953433) or

equivalent, to the front top of the engine block.

4. Extend the adhesive bead 13 mm (0.50 in) onto each lower intake manifold gasket.

Fig. 702: Applying Adhesive To Rear Top Of Engine Block
Courtesy of GENERAL MOTORS CORP.

5. Apply a 5 mm (0.197 in) bead of adhesive GM P/N 12346141 (Canadian P/N 10953433) or

equivalent, to the rear top of the engine block.

fasteners tightened while the adhesive is still wet to the
touch.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

6. Extend the adhesive bead 13 mm (0.50 in) onto each lower intake manifold gasket.

Fig. 703: View Of Intake Manifold Assembly & Bolts
Courtesy of GENERAL MOTORS CORP.

7. Install the lower intake manifold onto the engine block.

8. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or

equivalent, to the threads of the lower intake manifold bolts.

9. Install the lower intake manifold bolts.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 704: Intake Manifold Lower Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

NOTE:

Proper lower intake manifold fastener tightening sequence and
torque is critical. Always follow the tightening sequence, and
torque the intake manifold bolts using the 3 step method.
Failing to do so may distort the crankshaft bearing bore
alignment and cause damage to the crankshaft bearings.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado