Caution: Refer to Safety Glasses Caution in the Preface section.
Notice: 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. |
- 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.
- Spray cleaner GM P/N 12346139 (Canadian P/N 10953463),
GM P/N 12377981 (Canadian P/N 10953463) or equivalent
into the hole.
- Clean the cylinder head bolt holes with compressed air.
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.
- Measure the depth of the cylinder head bolt holes (1-10) and select the
correct length bolts as required.
- Check the cylinder head locating pins for proper installation.
- Inspect
the displacement markings (1) on the gasket, for proper usage.
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.
- Install the NEW left cylinder head gasket onto the locating pins.
- Install the cylinder head onto the locating pins and the gasket.
- Install the NEW cylinder head bolts.
Notice: Refer to Fastener Notice in the Preface section.
- Tighten the first design cylinder head bolts.
Tighten
- Tighten the first design M11 cylinder head bolts a first pass in
sequence to 30 N·m (22 lb ft).
- Tighten the first design M11 cylinder head bolts a second pass
in sequence to 90 degrees using the
J 45059
.
- 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
.
- 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.
- Tighten the second design cylinder head bolts.
Tighten
- Tighten the second design M11 cylinder head bolts (1-10)
a first pass in sequence to 30 N·m (22 lb ft).
- Tighten the second design M11 cylinder head bolts (1-10)
a second pass in sequence to 90 degrees using the
J 45059
.
- Tighten the second design M11 cylinder head bolts (1-10)
a final pass in sequence to 70 degrees using the
J 45059
.
- 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.
- Install the pushrods. Refer to
Valve Rocker Arm and Push Rod Replacement
.
- Install the left exhaust manifold. Refer to
Exhaust Manifold Replacement - Left Side
in Engine Exhaust.
- Install the coolant air bleed pipe. Refer to
Coolant Air Bleed Pipe Assembly Replacement
in Engine Cooling.
- Install the intake manifold. Refer to
Intake Manifold Replacement
.
- Install the generator bracket. Refer to
Generator Replacement
in Engine Electrical.