Cylinder Head Replacement - Left
Cylinder Head Replacement- Left^ Tools Required
- J 36660-A Torque/Angle Meter
- J 42385-100 Thread Repair Kit
Removal Procedure
1. Remove the valve rocker arms and pushrods.
2. Remove the engine coolant air bleed pipe.
3. Remove the two power steering pump bolts and power steering pump from the cylinder head.
4. Remove the exhaust manifold.
5. Remove the engine wiring harness ground bolts (2, 3) from the rear of the cylinder head. Reposition the ground wires.
Important: The cylinder head bolts are NOT reusable.
6. Remove the cylinder head bolts.
Notice: After removal, place the cylinder head on two wood blocks to prevent damage to the sealing surfaces.
7. Remove the cylinder head.
8. Remove the cylinder head gasket.
9. Discard the gasket.
10. Discard the cylinder head bolts.
11. Clean and inspect the cylinder head.
Installation Procedure
Caution: Wear safety glasses in order to avoid eye damage.
Notice: 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.
Important:
^ Do not reuse the cylinder head bolts. Install NEW cylinder head bolts during assembly.
^ Do not use any type of sealant on the cylinder head gasket (unless specified).
^ The cylinder head gasket 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 GM P/N 12346139, P/N 12377981 (Canadian P/N 10953463), or equivalent into the hole.
3. Clean the cylinder head bolt holes with compressed air.
4. Check the cylinder head locating pins for proper installation.
5. Install the NEW cylinder head gasket onto the locating pins.
Important: When properly installed, the tab on the left cylinder head gasket will be located left of center, or closer to the front of the engine, and the words "This Side Up", and the engine displacement, will be visible.
6. Inspect the gasket for proper installation.
7. Install the cylinder head onto the locating pins and the gasket.
8. Install the NEW cylinder head bolts.
Notice: Refer to Fastener Notice in Service Precautions.
9. Tighten the cylinder head bolts.
9.1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 Nm (22 ft. lbs.).
9.2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using the J 36660-A.
9.3. Tighten the M11 cylinder head bolts (1-8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence using J 36660-A.
9.4. Tighten the M8 cylinder head bolts (11-15) to 30 Nm (22 ft. lbs.). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
10. Install the engine wiring harness ground bolts (2, 3) to the cylinder head.
^ Tighten the engine wiring harness ground bolts to 50 Nm (37 ft. lbs.).
11. Install the exhaust manifold.
12. Install the power steering pump and pump mounting bolts to the cylinder head.
^ Tighten the steering pump mounting bolts to 28 Nm (21 ft. lbs.).
13. Install the engine coolant air bleed pipe.
14. Install the valve rocker arms and pushrods.