Intake Manifold removal for Sierra and Silverado?

The details mentioned here are for GMC Sierra, Chevrolet Silverado car models.
The intake manifold replacing procedure for 4.3L engine and 6.6L Engine car models.

The procedure for both engine models are as follows:-----

Removal & Installation

4.3L Engines

1. Before servicing the vehicle, refer to the Precautions section.
2. Relieve the fuel system pressure
3. Remove or disconnect the following:
   
   
   Negative battery cable

   Air intake duct

   Wiring harness connectors and brackets from the manifold

   Throttle linkage and bracket from the upper manifold

   Cruise control cable, if equipped

   Fuel lines at the rear of the lower intake manifold

   Brake booster vacuum hose from the upper intake manifold

   Ignition coil and bracket

   Purge solenoid and bracket

   Studs and intake manifold attaching bolts, mark for reassembly

   Upper intake manifold

   Distributor housing and rotor, mark for reassembly

   Upper radiator hose from the thermostat housing

   Heater hoses and the bypass hose from the lower intake manifold

   Exhaust Gas Recirculation (EGR) valve

   Transmission dipstick tube, if equipped

   Positive Crankcase Ventilation (PCV) valve and hoses

   Air conditioning compressor and bracket. Without disconnecting, position aside

   Alternator bracket and bolt next to the thermostat housing, if needed

   Lower intake manifold mounting bolts and the lower manifold

To install:

1. Clean all gasket mating surfaces thoroughly.
2. Position the new gaskets on the cylinder heads with the port blocking plates at the rear and the words THIS SIDE UP facing up.
3. Apply a ³ / ₁₆ inch (5mm) bead of RTV to the front and rear sealing surfaces on the engine block. Extend the bead ¹ / ₂ inch (13mm) up each cylinder head to retain the gasket.
4. Carefully position the lower intake manifold onto the engine.
5. Apply GM 1052080 or equivalent sealer to the lower intake manifold bolts
6. Torque the bolts using 3 steps in the sequence shown:
   1. Step 1: 27 inch lbs. (3 Nm).
   2. Step 2: 106 inch lbs. (12 Nm).
   3. Step 3: 11 ft. lbs. (15 Nm). 
      
      
      
      Fig. Lower intake manifold bolt tightening sequence-4.3L engines
7. Install or connect the following:
   
   
   Alternator bracket and bolts near the thermostat housing, if removed

   Air conditioning compressor

   PCV valve and hose

   Transmission dipstick tube, if equipped

   EGR valve

   Upper radiator and bypass hose to the thermostat housing

   Distributor.
8. Position the upper intake manifold gasket on the lower manifold.
   
   WARNING

   Be careful not to pinch the injector tubes between the upper and lower manifolds.
   
   
   
   
   Upper intake manifold. Torque the bolts and studs to 88 inch lbs. (10 Nm).

   Purge control bracket and valve

   Ignition coil

   Brake booster vacuum

   Fuel lines

   Accelerator cable

   Cruise control cable, if equipped

   Wiring harness brackets and connections

   Air intake duct

   Negative battery cable
9. Refill and bleed the cooling system.
10. Pressurize the fuel system and check for leaks.

6.6L Engine
Center Manifold

1. Remove the Exhaust Gas Recirculation (EGR) valve cooler tube.
2. Remove the intake manifold tube.
3. Remove and discard the 2 intake manifold tube gaskets.
4. Remove the turbocharger.
5. Remove the center intake manifold bolts/nuts.
6. Pull-up the center intake manifold in order to remove.
7. Remove and discard the gaskets.
8. Clean the center intake manifold in cleaning solvent and air dry.

To install:

Fig. Center intake manifold-6.6L engines

1. Install new center intake manifold gaskets.
2. Install the center intake manifold.
3. Install the center intake manifold bolts/nuts and tighten to 89 inch lbs. (10 Nm).
4. Install the turbocharger.
5. Install 2 new O-rings onto the intake manifold tube.
6. Lubricate the O-rings with clean engine oil to aid in the installation.
7. Install the intake manifold tube.
8. Install the EGR valve cooler tube.

Left & Right Manifolds

1. Drain the cooling system.
2. Remove or disconnect the following:
   
   NOTE

   The intake manifold uses sealer. If necessary, pry at the area by the common rail bolt holes and be careful to avoid damaging the sealing surfaces.
   
   
   
   
   Batteries cables

   Center intake manifold

   Fuel junction block

   Left or right fuel rail

   Intake manifold tube

   9 bolts and 2 nuts from the intake manifold. A bolt is located in the manifold opening.
   
   
   
   
   Intake manifold from the head. Cover the head openings to prevent debris from entering.
3. Clean all gaskets surface.

To install:

1. Install or connect the following: 
   
   NOTE

   The left and right side manifolds are NOT interchangeable.
   
   
   
   
   A ¹ / ₈ in. (2-3mm) wide to ¹ / ₁₆ in (0.5-1.5mm) high bead of sealant to the sealing surface of the intake manifold
   
   
   
   
   Intake manifold

   Bolts and nuts. Tighten to 15 ft. lbs. (20 Nm), in sequence. 
   
   
   

   Fig. Left side intake manifold bolt tightening sequence-6.6L engines

   
   
   
   

   Fig. Right side intake manifold bolt tightening sequence-6.6L engines

   Intake manifold tube

   Fuel rail

   Fuel junction block

   Turbocharger

   Negative battery cables
2. Fill cooling system.

These details will help.

Thanks.           

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html