Cylinder Head Replacement - Left

Cylinder Head Replacement - Left Side (6.2L, LS3, 7.0L, LS7)

Special Tools
* J 45059 Angle Meter
* J 42385-100 Head/Main Bolt Thread Repair Kit

Removal Procedure




1. Remove the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement (Service and Repair).
2. Remove the engine coolant air bleed pipe and covers. Refer to Engine Coolant Air Bleed Pipe Replacement (Service and Repair).
3. Remove the generator bracket. Refer to Generator Bracket Replacement (Generator Bracket Replacement).
4. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side (With LS7 or LS9) (Exhaust Manifold Replacement - Left Side)Exhaust Manifold Replacement - Left Side (LS3) (Exhaust Manifold Replacement - Left Side).
5. Remove the intake manifold. Refer to Intake Manifold Replacement (Service and Repair).
6. Remove the engine wiring harness ground bolt from the rear of the left cylinder head.
7. Reposition the engine wire harness ground strap away from the cylinder head.





Note: The cylinder head bolts are NOT reusable.

8. Remove the cylinder head bolts.
Caution: After removal, place the cylinder head on 2 wood blocks in order to prevent damage to the sealing surfaces.

9. Remove the cylinder head.




10. Remove the cylinder head gasket (217).
11. Discard the gasket.
12. Discard all M8 and M11 cylinder head bolts.
13. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection (6.2L LS3) (Overhaul)Cylinder Head Cleaning and Inspection (6.2L LS9) (Overhaul)Cylinder Head Cleaning and Inspection (7.0L) (Overhaul).

Installation Procedure




Warning: Refer to Safety Glasses Warning (Safety Glasses Warning).

Caution: 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.

Note:
* Do not use the cylinder head bolts again. Install NEW cylinder head bolts during assembly.
* Do not use any type of sealant on the cylinder head gasket, unless specified.
* The cylinder head gaskets must be installed in the proper direction and position.

1. Clean the engine block cylinder head bolt holes, if required.
Thread repair tool J 42385-107 may be used to clean the threads of old threadlocking material.
2. Spray cleaner into the hole. Refer to Adhesives, Fluids, Lubricants, and Sealers (6.2L LS3) (Fluid Type Specifications)Adhesives, Fluids, Lubricants, and Sealers (6.2L LS9) (Fluid Type Specifications)Adhesives, Fluids, Lubricants, and Sealers (7.0L) (Fluid Type Specifications) for the correct part number.
3. Clean the cylinder head bolt holes with compressed air.
4. Install the cylinder head locating pins (230).




5. Inspect the locating pins for proper installation.




6. Inspect the displacement markings on the gasket for proper usage.




7. Install the NEW cylinder head gasket (217) onto the locating pins.




8. Install the cylinder head (218) onto the locating pins and the gasket.
9. Install the NEW cylinder head bolts (200, 221).





Caution: Refer to Fastener Caution (Fastener Caution).

10. Tighten the cylinder head bolts.

1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 Nm (22 lb ft).
2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using the J 45059 .
3. Tighten the M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees using the J 45059 .
4. Tighten the M8 cylinder head bolts (11-15) to 30 Nm (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

11. Install the intake manifold. Refer to Intake Manifold Replacement (Service and Repair).




12. Position the engine wire harness ground strap against the cylinder head.
13. Install the engine wiring harness ground bolt to the rear of the left cylinder head. Tighten the bolt to 32 Nm (24 lb ft).
14. Install the exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side (With LS7 or LS9) (Exhaust Manifold Replacement - Left Side)Exhaust Manifold Replacement - Left Side (LS3) (Exhaust Manifold Replacement - Left Side).
15. Install the generator bracket. Refer to Generator Bracket Replacement (Generator Bracket Replacement).
16. Install the engine coolant air bleed pipe. Refer to Engine Coolant Air Bleed Pipe Replacement (Service and Repair).
17. Install the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement (Service and Repair).