47. Cylinder Head Assemble
Cylinder Head Assemble
Tools Required
^ J8062 Valve Spring Compressor
^ J43105 Valve Stem Seal Installer
Checking Valve Spring Installed Height
1. Install the valve rotator (3), the valve (4), the valve spring cap (1) and the valve stem keys (5) into the cylinder head.
2. Using a snap gage or inside micrometer, measure the distance from the top of the valve rotator to the bottom of the valve spring cap.
3. Important: Never shim the spring to obtain an installed height under the specified amount.
^ Install the valve spring seat shims under the rotator, between the rotator and the cylinder head spring seat.
^ Add a maximum of one valve spring seat shim, up to 0.726 mm (0.030 inch) thick to achieve the valve spring installed height specification.
Install a valve spring seat shim if the valve spring installed height measurement is above the specification.
4. Recheck the valve spring installed height, replace the cylinder head if the valve spring installed height cannot be obtained.
Valve Installation
1. Caution: Refer to Safety Glasses Caution in Service Precautions.
Caution: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.
Lubricate the valve stems (232) with clean engine oil.
2. Insert the valves into their proper locations.
3. Install the necessary valve spring shims onto the cylinder head, if applicable.
4. Lubricate the rotators (216) with clean engine oil.
5. Install the rotators over the guide and on top of the cylinder head or valve spring shims, if applicable.
6. Important: When installing valve stem oil seals onto the valve guides, be careful not to tear the seal lip.
Important: When installing valve seals, J43105 must be used to achieve correct installation. Failure to use J43105 may cause excessive oil consumption.
Lubricate the valve stem seal and the outside diameter of the valve guide with clean engine oil.
7. Install the valve stem oil seals (217) over the valve tip and onto the valve guides using J43105 (1). Tap the valve stem seal onto the valve guide until the J43105 fully seats the seal.
8. Important: When installing valve springs, the small end of the valve spring must be installed up.
Install the valve springs (218).
9. Install the valve spring caps (219).
10. Use the J8062 in order to compress the valve spring. Compress the spring enough to clearly see the valve stem key grooves of the valve.
11. Install the valve stem keys.
^ Use grease to hold the keys in place.
^ Ensure that the keys seat properly in the upper groove of the valve stem.
12. Release and remove the J8062.
13. Lightly tap the end of the valve stem with a plastic-faced hammer to seat the keys.
14. Apply sealant GM P/N 12346004, (Canadian P/N 10953480), or equivalent to the threads of the engine coolant temperature (ECT) sensor.
15. Notice: Refer to Fastener Notice in Service Precautions.
Install the ECT sensor into the right cylinder head.
Tighten the ECT sensor to 50 Nm (37 lb ft).
16. Install the ECT sensor bracket and bolt.
Tighten the ECT sensor bracket bolt to 50 Nm (37 lb ft).
17. Apply sealant GM P/N 12346004, (Canadian P/N 10953480), or equivalent to the threads of the cylinder head coolant hole plug.
18. Install the cylinder head coolant hole plug into the left cylinder head.
Tighten the cylinder head coolant hole plug to 50 Nm (37 lb ft).