Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008UPLANDER V6-3.9LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIROVERHAULREPAIR INSTRUCTIONS56. CYLINDER HEAD ASSEMBLE
2008 Chevrolet Uplander V6-3.9L
56. Cylinder Head Assemble
2008 Chevrolet Uplander V6-3.9LSECTION 56. Cylinder Head Assemble
Cylinder Head Assemble
Tools Required
* EN-47823 Valve Spring Compressor Adapter
* J 5892-D Valve Spring Compressor
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, ensuring proper intake - black seal and exhaust - brown seal, seals are installed.
5. Install the valve springs.
6. Install the valve spring caps.
7. Using caution so as not to damage the valve spring or valve spring dampener, compress the valve springs using the J 5892-D (1) and theEN-47823 (2).
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. Apply sealer P/N 21485278 to the coolant temperature sensor.
Notice: Refer to Fastener Notice (Fastener Notice).
12. Install the coolant temperature sensor, if required.
Tighten the coolant temperature sensor to 23 N.m (17 lb ft).
13. Install the heater inlet pipe stud, if required.
Tighten the heater inlet pipe stud to 35 N.m (26 lb ft).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.