Cylinder Head Installation - Left

Tools Required

• J 42385-100  Head/Main Bolt Thread Repair Kit. See Special Tools and Equipment .
• J 45059  Angle Meter

Fig 1: Identifying Cylinder Head Locating Pins Installation Position
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
NOTE: Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.
IMPORTANT:
• Do not use the cylinder head bolts again. Install NEW cylinder head bolts during assembly.
• Do not use any type sealant on the cylinder head gasket, unless specified.
• The cylinder head gaskets must be installed in the proper direction and position.
1. Clean the engine block cylinder head bolt holes, if required.

   Thread repair tool J 42385-107 may be used to clean the threads of old threadlocking material.

2. Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), GM P/N 12377981 (Canadian P/N 10953463) or equivalent into the hole.
3. Clean the cylinder head bolt holes with compressed air.
Fig 2: View Of 100 mm & 155 mm Cylinder Head Bolts
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: First design engine blocks have different drill and tap depths using both medium length 100 mm (3.94 in) and long 155 mm (6.1 in) M11 cylinder head bolts. Second design engine blocks use only the medium length 100 mm (3.94 in) bolt with a common drill and tap depth.
4. Measure the depth of the cylinder head bolt holes (1-10) and select the correct length bolts as required.
5. Check the cylinder head locating pins for proper installation.
Fig 3: View Of Cylinder Head Gasket Displacement Markings
Courtesy of GENERAL MOTORS CORP.
6. Inspect the displacement markings (1) on the gasket, for proper usage.
Fig 4: View Of Left Cylinder Head Gasket & Locator Pins
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: When properly installed, the tab on the left cylinder head gasket will be located left of center, or closer to the front of the engine.
7. Install the NEW left cylinder head gasket onto the locating pins.
Fig 5: View Of Cylinder Head & Bolts (Left)
Courtesy of GENERAL MOTORS CORP.
8. Install the cylinder head onto the locating pins and the gasket.
9. Install the NEW cylinder head bolts.
Fig 6: Cylinder Head Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
10. Tighten the first design cylinder head bolts.

    Tighten: 

    1. Tighten the first design M11 cylinder head bolts a first pass in sequence to 30 N.m (22 lb ft).
    2. Tighten the first design M11 cylinder head bolts a second pass in sequence to 90 degrees using the J 45059  .
    3. Tighten the first design M11 cylinder head bolts (1,2,3,4,5,6,7,8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence to using the J 45059  .
    4. Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 N.m (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

11. Tighten the second design cylinder head bolts.

    Tighten: 

    1. Tighten the second design M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb ft).
    2. Tighten the second design M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using the J 45059  .
    3. Tighten the second design M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees using the J 45059  .
    4. Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 N.m (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.