Cylinder Head Replacement - Left

Cylinder Head Replacement - Left

^ Tools Required
- J 45059 Angle Meter
- J 42385-200 Thread Repair Kit

Removal Procedure
1. Remove the engine cover.
2. Remove the generator bracket.
3. Remove the coolant air bleed pipe.
4. Remove the left exhaust manifold.
5. Remove the pushrods.





6. Important: The cylinder head bolts are NOT reusable.

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 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, found in J 42385-200 may be used to clean the threads of old threadlocking material.
2. Use spray cleaner GM U.S. P/N 12346139, P/N 12377981, Canada 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. 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.

Inspect the displacement markings (1) on the gasket for proper usage.





6. Install the NEW left cylinder head gasket onto the locating pins.





7. Install the cylinder head onto the locating pins and gasket.
8. Install the NEW cylinder head bolts.





9. Notice: Refer to Fastener Notice in Service Precautions.

Tighten the cylinder head bolts.
1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 Nm (22 ft. lbs.).
2. Tighten the M11 cylinder head bolts a second pass in sequence to 90 degrees using J 45059 .
3. Tighten the M11 cylinder head bolts (1, 2, 3, 4, 5, 6, 7, 8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence using J 45059.
4. Tighten the M8 cylinder head bolts (11, 12, 13, 14, 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 pushrods.
11. Install the left exhaust manifold.
12. Install the coolant air bleed pipe.
13. Install the generator bracket.
14. Install the engine cover.