Tools Required

J 8062  Valve Spring Compressor - Head Off

Fig 1: Valve Stem Keys, Valve Spring Cap & Valve Spring
Courtesy of GENERAL MOTORS CORP.
1. Clean the cylinder head valve spring shim area.
IMPORTANT: When using the valves and related components again, install the parts to their original location.
2. Install the valves (228) into the proper port. Refer to Separating Parts .
3. Install the valve stem oil seal (222).
4. Install the valve spring (223).
5. Install the valve spring cap (224).
Fig 2: Compressing Valve Spring Using J 8062
Courtesy of GENERAL MOTORS CORP.
6. Using the J 8062  , compress the valve spring.
7. Install the valve stem keys.
   1. Use grease in order to hold the keys in place and remove the J 8062  .
   2. Ensure the keys seat properly in the groove of the valve stem.
   3. Tap the end of the valve stem with a plastic face hammer to seat the keys, if necessary.
Fig 3: Measuring Valve Spring Installed Height
Courtesy of GENERAL MOTORS CORP.
8. Using a ruler, measure the valve spring installed height.

   Measure from the base of the valve spring to the top of the valve spring.

   Specification: 

   • If the installed height exceeds 46.25 mm (1.82 in), install a valve spring shim of approximately 0.5 mm (0.02 in) thick.
   • Do not shim the valve spring to obtain less than the specified height.
   • Do not assemble the components without a spring shim on the cylinder head.

9. Install the remaining valves, springs, and other components.
Fig 4: Locating Coolant Temperature Sensor
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10. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the coolant temperature sensor (725).
NOTE: Refer to Fastener Notice .
11. Install the coolant temperature sensor into the left cylinder head.

    Tighten:  Tighten the coolant temperature sensor to 20 N.m (15 lb ft).

Fig 5: Locating Coolant Plug
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12. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the cylinder head plug (229).
13. Install the cylinder head plug to the right cylinder head.

    Tighten:  Tighten the cylinder head plug to 20 N.m (15 lb ft).

Fig 6: Locating Cylinder Head Core Hole Plug
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14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the cylinder head plugs (216).
15. Install the cylinder head plugs into the cylinder head.

    A properly installed plug should be installed 2.5 mm (0.1 in) below the end face of the head.

Fig 7: Identifying Rivet-Type Plug
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16. Second design applications use a rivet-type plug (1) at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug.
Fig 8: Engine Coolant Air Bleed Cover, Bolts & Seals
Courtesy of GENERAL MOTORS CORP.
17. If plug removal is required, install a first design coolant air bleed cover and bolt (312) to complete the repair.