Caution: Wear safety glasses in order to avoid eye damage.
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.
- Check the cylinder head locating pins for proper installation.
Important: When properly installed, the tab on the right cylinder head gasket will
be located right of center or closer to the front of the engine.
- Install the NEW right 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 cylinder head bolts.
Tighten
- Tighten the M11 cylinder head bolts a first pass in sequence
to 30 N·m (22 lb ft).
- Tighten the M11 cylinder head bolts a second pass in sequence
to 90 degrees using the J 36660-A
.
- Tighten the 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 36660-A
.
- 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.
- The cylinder head gasket displacement
can be verified by markings visible on the underside of the right
gasket locating tab.
Some 5.3L head gaskets may have 48
or 53 stamped onto the locating tab.