Chevrolet Avalanche and GM savana 4.3L Engine Cylinder head Removal?

How to replace Cylinder head.
The procedure mentioned here is for Chevrolet Avalanche, Express Van, and GM Savana car models.

In this chapter the details are provided to replace Cylinder head for 4.3L engine.
The procedure with help diagrams to make the task easy.

Removal & Installation

4.3L Engine
Left Side

1. Remove or disconnect the following:
   
   NOTE

   Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.
   
   
   
   
   Battery negative cable

   Coolant

   Accessory drive belt

   Cooling fan assembly

   Power steering pump mounting bracket

   Power steering pump mounting bracket stud from the cylinder head

   Lower intake manifold

   Exhaust manifold

   Spark plug wire harness and the spark plug wire support

   Valve pushrods

   Ground strap and ground wire bolt from the rear of the cylinder head

   Engine Coolant Temperature (ECT) sensor (if applicable)

   ECT gauge sensor (if applicable)

   Spark plugs

   Spark plug wire support

   Cylinder head bolts

   Cylinder head and the gasket
2. Clean the cylinder head bolts and the engine block bolt holes.

To install:

1. Inspect the dowel pins (cylinder head locator) for proper installation.
   
   NOTE

   Do not use any type sealer on the cylinder head gasket (unless specified).
2. Install or connect the following: 
   
   
   NEW cylinder head gasket in position over the dowel pins (cylinder head locator)

   Cylinder head onto the engine block. Guide the cylinder head carefully into place over the dowel pins and the cylinder head gasket.

   Sealant GM P/N 12346004, or equivalent, to the threads of the cylinder head bolts

   Cylinder head bolts finger-tight 
   
   
   

   Fig. Dowel pin installation-4.3L engines
3. Tighten the cylinder head bolts in sequence:
   1. First pass: 22 ft. lbs. (30 Nm).
   2. Second pass: Long bolts (1, 4, 5, 8, and 9)-+ 75 degrees.
   3. Second pass: Medium bolts (12 and 13)-+ 65 degrees.
   4. Second pass: Short bolts (2, 3, 6, 7, 10, and 11)-+ 55 degrees.
4. Install or connect the following:
   
   
   Spark plug wire support and bolts. Tighten to 106 inch lbs. (12 Nm).

   Spark plugs. Tighten to 11 ft. lbs. (15 Nm), if USED; 22 ft. lbs. (30 Nm), if NEW.
5. If reusing the ECT gauge sensor (if applicable), apply sealant GM P/N 12346004 or equivalent to the threads of the ECT gauge sensor. Install the ECT gauge sensor (if applicable). Tighten the sensor to 15 ft. lbs. (20 Nm).
6. Install or connect the following:
   
   
   Ground strap and the ground wire bolt. Tighten the bolt to 12 ft. lbs. (16 Nm).

   Valve pushrods

   Lower intake manifold

   Exhaust manifold

   Stud for the power steering pump mounting bracket to the cylinder head. Tighten the power steering pump mounting bracket stud to 15 ft. lbs. (20 Nm).

   Power steering pump mounting bracket

   Engine cooling fan assembly

   Coolant

   Battery negative cable

Right Side

1. Remove or disconnect the following:
   
   
   Battery negative cable

   Coolant

   Engine cooling fan assembly

   Alternator mounting bracket

   Alternator mounting bracket stud from the cylinder head

   Lower intake manifold

   Exhaust manifold

   Spark plug wire harness and spark plug wire support

   Valve pushrods

   Cylinder head and the gasket
2. Clean the engine block and the cylinder head sealing surfaces.

To install:

1. Inspect the dowel pins (cylinder head locator) for proper installation.
   
   NOTE

   Do not use any type sealer on the cylinder head gasket (unless specified).
2. Install or connect the following:
   
   
   NEW cylinder head gasket in position over the dowel pins (cylinder head locator)

   Cylinder head onto the engine block. Guide the cylinder head carefully into place over the dowel pins and the cylinder head gasket.

   Sealant GM P/N 12346004 or equivalent to the threads of the cylinder head bolts

   Cylinder head bolts finger-tight
3. Tighten the cylinder head bolts in sequence:
   1. First pass: 22 ft. lbs. (30 Nm).
   2. Second pass: Long bolts (1, 4, 5, 8, and 9)-+ 75 degrees.
   3. Second pass: Medium bolts (12 and 13)-+ 65 degrees.
   4. Second pass: Short bolts (2, 3, 6, 7, 10, and 11)-+ 55 degrees.
4. Install or connect the following:
   
   NOTE

   The front spark plug wire support bolt is used to fasten the oil level indicator tube, and will be installed within the oil level indicator tube installation procedure.
   
   
   
   
   Spark plug wire support and bolts. Tighten only the rear support bolt to 106 inch lbs. (12 Nm).
   
   
   
   
   Front spark plug wire support bolt

   Spark plugs. Tighten to 11 ft. lbs. (15 Nm), if USED; 22 ft. lbs. (30 Nm), if NEW.

   Valve pushrods

   Lower intake manifold

   Spark plug wire harness and wire support. Tighten to 106 inch lbs. (12 Nm).

   Exhaust manifold

   Stud for the alternator mounting bracket. Tighten the alternator mounting bracket stud to 15 ft. lbs. (20 Nm).

   Alternator mounting bracket

   Engine cooling fan assembly

   Coolant

   Battery negative cable

These details will help.

Thanks.           

FOR MORE HELP GO TO: ---

Car repair guide?

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