Cylinder Head Replacement - Left

Cylinder Head Replacement- Left

Removal Procedure





1. Drain the cooling system.
2. Remove the intake manifold.
3. Remove the valve rocker arms and pushrods.
4. Remove the engine harness ground bolts.
5. Reposition the engine harness grounds from the cylinder head.
6. Remove the shift cable bracket bolts from the cylinder head.





7. Remove the water crossover.
8. Remove the exhaust manifold.
9. Remove and discard the cylinder head bolts (1, 2, and 3).





Important: Place the cylinder head on two wood blocks to prevent damage to the sealing surfaces.

10. Remove the cylinder head.





11. Remove and discard the cylinder head gasket.
12. Clean and inspect the cylinder head.

Installation Procedure





Notice: Do not reuse a cylinder head gasket once the initial clamping loads are applied. The initial tightening sequence procedure of the cylinder head bolts compresses the cylinder head gasket. If any bolt must be loosened once the initial sequence is started the cylinder head gasket must be replaced. Failure to replace the cylinder head gasket can lead to cylinder head bolt breakage or cylinder head gasket failure. A broken cylinder head bolt or failed cylinder head gasket can lead to extensive engine damage.

Important: Make sure the threaded holes in the engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align the cylinder head gasket locating marks face up. Ensure that the head gasket tabs are located over the numbers 1 and 2 cylinders for correct Installation.

1. Place a NEW cylinder head gasket into position.





2. Install the cylinder head.





Notice: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.

Important: The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt.

3. If not pre-applied to the NEW cylinder head bolts, apply sealant GM U.S. P/N 12346004, Canada P/N 10953480, or equivalent to the cylinder head bolts.
4. Install NEW cylinder head bolts (1, 2, and 3)





Notice: Refer to Fastener Notice in Service Precautions.

Notice: The cylinder head bolt tightening sequence must be followed. The final angle tightening sequence of the cylinder head bolts varies depending on the length of the cylinder head bolt. Failure to angle tighten the specific length bolt the proper number of degrees can lead to cylinder head bolt failure or improper clamping load of the cylinder head gasket. Cylinder head bolt or cylinder head gasket failure can lead to extensive engine damage.

Important: 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.
5. Tighten the cylinder head bolts.
5.1. Tighten the cylinder head bolts a first pass in sequence to 30 Nm (22 ft. lbs.).
5.2. Tighten the cylinder bolts a second pass in sequence to 30 Nm (22 ft. lbs.) then an additional 120 degrees using J 36660-A.
5.3. Tighten the bolts (1, 2, 3, 6,7, 8, 9, 10, 11, 14, 16, and 17) an additional 60 degrees, bolts (15 and 18) an additional 45 degrees, and bolts (4, 5, 12, and 13) an additional 30 degrees using J 36660-A.
6. Install the exhaust manifold.
7. Install the water crossover.
8. Install the shift cable bracket bolts to the cylinder head.
^ Tighten the shift cable bracket bolts to 40 Nm (30 ft. lbs.).





9. Position the engine harness grounds to the cylinder head.
10. Install the engine harness ground bolts.
^ Tighten the engine harness ground bolts to 12 Nm (106 inch lbs.).
11. Install the valve rocker arms and pushrods.
12. Install the intake manifold.
13. Fill the cooling system.