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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1219 (Engine Mechanical - 4.2L 6-Cylinder (Unit Repair)) >> Repair Instructions >> Cylinder Head Removal

Cylinder Head Removal

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 .
  1. Remove the cylinder head bolts.
    2. Fig 1: Removing Cylinder Head Bolts
    G01706500Courtesy of GENERAL MOTORS CORP.
  2. Remove the cylinder head.
    3. Fig 2: Removing Cylinder Head
    G01706501Courtesy of GENERAL MOTORS CORP.
  3. Remove the cylinder head gasket.
    4. Fig 3: Removing Cylinder Head Gasket
    G01706502Courtesy of GENERAL MOTORS CORP.
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