Cylinder Head Installation

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Torque To Yield (TTY) bolts used on cylinder head and main bearing cap bolts may bend or break during removal. Interaction between TTY bolt and threads may cause bolt to bend or break during removal. To minimize this problem, prior to removing TTY bolts, perform the follwoing:

Using an appropriate size punch and hammer, rap head of each bolt. Vibration produced by this procedure will assist in a successful removal.
If a bolt breaks during disassembly, a broken bolt Extractor Kit (EN-47702) has been released to assist in removal of remaining bolt segment. Many times the remaining bolt fragment will back out easily with a pick tool or reverse twist drill bit. NEVER reuse TTY bolts. Always make sure block threaded holes are clean and DO NOT place oil or threadlock on NEW bolts. See GM TSB 05-06-01-026B ON TORQUE TO YIELD BOLT BREAKAGE .

Tools Required : J 36660-A Torque Angle Meter

Install the dowel pins (cylinder head locator) (if necessary).
Install a new cylinder head gasket.

Fig 1: Installing A New Cylinder Head Gasket

Courtesy of GENERAL MOTORS CORP.

Install the cylinder head.

Fig 2: Installing Cylinder Head

Courtesy of GENERAL MOTORS CORP.

Install new cylinder head bolts.

Fig 3: Installing New Cylinder Head Bolts

Courtesy of GENERAL MOTORS CORP.

Tighten the new cylinder head bolts in the following sequence:

Fig 4: Tightening Cylinder Head Bolts In Sequence
Courtesy of GENERAL MOTORS CORP.

NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Tighten
1. 5.1. Tighten the (14) long cylinder head bolts in sequence to 30 N.m (22 lb ft).
2. 5.2. Use J 36660-A to tighten the cylinder head bolts in sequence an additional 155 degrees.
3. 5.3. Tighten the (2 Short) end bolts to 20 N.m (15 lb ft).
4. 5.4. Tighten the (1 Long) end bolt to 18 N.m (13 lb ft).