Cylinder Head Assemble

Tools Required 

J 38606  Valve Spring Compressor. See Special Tools .

Fig 1: Valve Locks, Caps, Seats & Spring
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Use oversize valve stem seals if you install oversize valves.
1. Lubricate the valve stem with clean engine oil.
2. Install the valves.
3. Lightly tap the new or reconditioned valves into the valve seat.
4. Install the valve stem oil seals.
5. Install the valve springs.
6. Install the valve spring caps.
Fig 2: Compressing Valve Springs
Courtesy of GENERAL MOTORS CORP.
7. Compress the valve springs using the J 38606  . See Special Tools .
8. Install the valve spring cap keys. Hold the valves in place with grease, if necessary.
9. Release the valve springs.
10. Ensure that the valve locks are seated.
11. Measure valve spring installed height.
12. If the valve spring installed height is not within specifications install 0.25 mm (0.010 in) rocker arm shims P/N 88894006 as needed. If more than 2 shims are needed replace the cylinder head or valve.
Fig 3: View Of Heater Inlet Pipe Stud & Coolant Temperature Sensor
Courtesy of GENERAL MOTORS CORP.
13. Apply sealer P/N 21485278 to the coolant temperature sensor.
NOTE: Refer to Fastener Notice in Cautions and Notices.
14. Install the coolant temperature sensor, if required.

    Tighten:  Tighten the coolant temperature sensor to 23 N.m (17 lb ft).

15. Install the heater inlet pipe stud, if required.

    Tighten:  Tighten the heater inlet pipe stud to 35 N.m (26 lb ft).