Chevrolet Van 8.1L Engine Cylinder head remove?

Details to replace cylinder head.

Covers All U.S. And Canadian Models Of Chevrolet Avalanche, Express Van, and GM Savana.

In this chapter details are provided to remove 8.1L Cylinder head.

The procedure to complete this task is as follows:----
8.1L Engine
Left Side

1. Drain the cooling system.
2. Remove or disconnect the following:
   
   
   Negative battery cable

   Water crossover

   Intake manifold

   Valve cover

   Rocker arms and pushrods, keeping them in order for installation

   Engine harness ground bolts
3. Reposition the engine harness grounds and ground straps from the cylinder head.
   
   NOTE

   The cylinder head bolts must be replaced for installation.
   
   
   
   
   Exhaust manifold

   Cylinder head bolts, then discard
   
   
   
   
   Cylinder head. Place the head on 2 wood blocks to protect the sealing surfaces while it is removed.

To install:

NOTE

The cylinder head should be cleaned and inspected for warpage or damage before installation.

1. Thoroughly clean the mating surfaces of the head and block. Clean the bolt holes thoroughly.
   
   NOTE

   If a composition gasket is used, do not use sealer.
2. Align the cylinder head gasket locating marks to face up. Make sure that the gasket tabs are located of the No. 1 and 2 cylinder for proper installation.
3. Install or connect the following:
   
   NOTE

   The long bolts are used in locations 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, and 17. The medium length bolts are used in locations 15 and 18. The short bolts are used in locations 4, 5, 12, and 13.
   
   
   
   
   New cylinder head gasket

   Cylinder head

   Sealer to the threads of new cylinder head bolts, if not pre-applied
4. Tighten the head bolts, in sequence, in 4 stages, as follows:
   1. Step 1: 22 ft. lbs. (30 Nm).
5. Step 2: 22 ft. lbs. (30 Nm)
   1. Step 3: Additional 120 degrees using a torque angle meter.
   2. Step 4: Torque bolt numbers. 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16 and 17 an additional 60 degrees.
   3. Tighten bolts 15 and 18 an additional 45 degrees, and bolt numbers 4, 5, 12 and 13 an additional 30 degrees. 
      
      
      
      Fig. Cylinder head bolt tightening sequence-8.1L engines
6. Install or connect the following:
   
   
   Exhaust manifold

   Water crossover

   Engine harness grounds and ground strap

   Rocker arms and pushrods

   Valve cover

   Intake manifold
7. Connect the battery cable and refill the cooling system.

Right Side

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

   The cylinder head bolts must be replaced for installation.
   
   
   
   
   Negative battery cable

   Intake manifold

   Valve cover

   Rocker arms and pushrods, keeping them in order for installation

   Engine Coolant Temperature (ECT) sensor clip from the bracket

   ECT sensor

   ECT sensor bracket bolt and bracket

   Heater inlet and outlet hoses from the hose bracket

   Water crossover

   Exhaust manifold

   Cylinder head bolts, then discard
   
   
   
   
   Cylinder head. Place the head on 2 wood blocks to protect the sealing surfaces while it is removed.

To install:

NOTE

The cylinder head should be cleaned and inspected for warpage or damage before installation.

1. Thoroughly clean the mating surfaces of the head and block. Clean the bolt holes thoroughly.
   
   NOTE

   If a composition gasket is used, do not use sealer.
2. Align the cylinder head gasket locating marks to face up. Make sure that the gasket tabs are located of the no. 1 and 2 cylinder for proper installation.
3. Install or connect the following:
   
   NOTE

   The long bolts are used in locations 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, and 17. The medium length bolts are used in locations 15 and 18. The short bolts are used in locations 4, 5, 12, and 13.
   
   
   
   
   New cylinder head gasket

   Cylinder head

   Sealer to the threads of new cylinder head bolts, if not pre-applied
4. Tighten the head bolts, in sequence, in 4 stages, as follows:
   1. Step 1: 22 ft. lbs. (30 Nm).
5. Step 2: 22 ft. lbs. (30 Nm)
   1. Step 3: Additional 120 degrees using a torque angle meter.
   2. Step 4: Torque bolt numbers. 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16 and 17 an additional 60 degrees.
   3. Tighten bolts 15 and 18 an additional 45 degrees, and bolt numbers 4, 5, 12 and 13 an additional 30 degrees.
      
      
      

      

      Fig. Cylinder head bolt tightening sequence-8.1L engines
6. Install or connect the following:
   
   
   Exhaust manifold

   Water crossover

   Heater hose bracket and bolts. Tighten the bolts to 37 ft. lbs. (50 Nm).

   ECT sensor bracket and bolt. Tighten to 37 ft. lbs. (50 Nm).

   ECT sensor

   ECT sensor clip

   Rocker arms and pushrods

   Valve cover

   Intake manifold
7. Connect the battery cable and refill the cooling system.

These details will help.

Thanks.           

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