Cylinder Head Installation
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 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.
- Install the cylinder head.
- Install new cylinder head bolts.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
- Tighten the new cylinder head bolts in the following sequence:
Tighten
- 5.1. Tighten the (14) long cylinder head bolts in sequence to 30 N.m (22 lb ft).
- 5.2. Use J 36660-A to tighten the cylinder head bolts in sequence an additional 155 degrees.
- 5.3. Tighten the (2 Short) end bolts to 7 N.m (62 lb in).
Use J 36660-A to tighten the short cylinder head end bolts an additional 60 degrees.
- 5.4. Tighten the (1 Long) end bolt to 7 N.m (82 lb in).
Use J 36660-A to tighten the long cylinder-head end bolt an additional 120 degrees.