Cylinder Head Installation

Special Tools 

EN-470-B  Angular Torque Wrench.

For equivalent regional tools, refer to Special Tools .

WARNING:

Wear safety glasses when using compressed air in order to prevent eye injury.

1. Clean the sealing surfaces and remove dirt and old gasket material from thread bores, water galleries and oil galleries.
Fig 1: Cylinder Head, Gasket, Bolts And Guide Sleeves
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Mind the guide sleeves (4) and (5).

2. Install a NEW cylinder head gasket (3). The marking "Top" should point to the cylinder head.
3. Install the cylinder head (2).
4. Install 12 NEW cylinder head bolts (1) and hand tighten.
Fig 2: Straight Edge Tool
Courtesy of GENERAL MOTORS COMPANY
5. Lay a straight edge (1) against the engine block and cylinder head. Adjust the transition in area (2) until there is no clearance between cylinder head and straight edge, using a rubber mallet.
Fig 3: Cylinder Head Bolts Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution

CAUTION:

Refer to Torque-to-Yield Fastener Caution .

6. Tighten the cylinder head bolts in the sequence shown and to the following specifications:
   1. Tighten the cylinder head bolts to 35 N.m (26 lb ft).
   2. Tighten the cylinder head bolts an additional 180 degrees. Use EN-470-B  wrench.