Cylinder Head and Valve Train Components Replace Opel Antara I



Cylinder Head and Valve Train Components Replace

Disassemble

Note: Ensure valve heads will not contact anything during the following step in order to avoid bending or damage.

1. Remove the cylinder head assembly. Refer to Cylinder Head Assembly Replace .
2. Using an appropriately sized deep socket (1) and a plastic hammer (2), lightly tap on the valve spring retainer to loosen the valve collets.

Warning: Compressed valve springs (1) have high tension against the valve spring compressor (2). Valve springs that are not correctly compressed by, or are 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.

Important: Do not compress the valve springs less than 24.0 mm. Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

3. Compress the valve spring (1) using valve spring compressor Tool No. J-8062 (2) and adaptor Tool No. EN-46119.

4. Remove the valve collets using Tool EN-46117 (1).
5. Remove the valve spring compressor (2) and the adapter (3).

6. Remove the valve spring retainer (1).
7. Remove the valve spring (2).

8. Remove the valves (1).

Note: Never reuse a valve stem oil seal.

9. Remove the valve stem oil seal using Tool No. EN-46116 and discard.
10. Repeat these procedures for the remaining valves.

11. Remove the cylinder head oil gallery expansion plugs (1).

12. Remove the cylinder head coolant threaded plugs (1).

Important: Due to the aluminium alloy construction of the cylinder head, wire brushes and steel scrapers must not be used during the cleaning process, as damage to sealing surfaces may occur. Use a wood or plastic scraper as an alternative. Clean

Remove any old thread sealant, gasket material or sealant using commercially available plastic or wooden scraper.

1. Clean all cylinder head surfaces with non-corrosive solvent.
2. Blow out all the oil galleries using compressed air.
3. Remove any carbon deposits from the combustion chambers.
4. Clean any debris or build-up from the lifter pockets.

Inspect

1. Inspect the cylinder head (1) camshaft bearing surfaces for the following conditions:
2. If any of the above conditions exist on the camshaft bearing surfaces, replace the cylinder head. Do not machine the camshaft bearing journals.

3. Inspect the cylinder head for the following:
4. If the cylinder head is cracked or damaged, it must be replaced. No welding or patching of the cylinder head is recommended.
5. Inspect the camshaft position actuator oil feed check valves (1) to ensure they are correctly positioned in the cylinder head. The camshaft position actuator oil feed check valve should be flush to 2 mm below the cylinder head deck surface (A).

6. Damaged, restricted or clogged check valves (1) can be replaced using the camshaft position actuator check-ball remover/installer, Tool No. EN-46122.

Measure

Camshaft Journal Clearance

1. Install the camshaft bearing cap in the cylinder head without the camshaft.
2. Install the camshaft cap bolts and tighten the bolts to 10 N•m (89 lb-in).
3. Measure the camshaft bearings using an inside micrometer.
4. Subtract the camshaft journal diameter from the camshaft bearing diameter. This will provide the running clearance. If the running clearance exceeds specifications and the camshaft journals are within specification, replace the cylinder head.

Camshaft Journal Alignment

1. Inspect the cylinder head camshaft bearing surfaces for any imperfections or scratches that could inhibit correct camshaft clearances. Repair minor imperfections or scratches.
2. Install the camshafts in the cylinder head.
3. Install the camshaft bearing caps.
4. Install the camshaft cap bolts and tighten the bolts to 10 N•m (89 lb-in).
5. Ensure the camshafts spin freely in the cylinder head. If the camshaft does not run freely, replace the cylinder head.

Assemble

1. Install the cylinder head coolant threaded plugs (1).

Tighten

Tighten the cylinder head coolant threaded plugs to 31 N•m (23 lb-ft).

2. Install the cylinder head oil gallery expansion plugs (1).

Note: Never reuse a valve stem oil seal. Always use new seals when assembling the cylinder head.

3. Fit the valve stem oil seals onto the guides using Tool No. EN-46116 (1).

Note: Force should only be applied to the valve spring contact area of the new valve stem oil seal during installation.

4. Push and twist the valve stem oil seal into position on the valve guide until the seal positively locks on the guide using Tool No. EN-46116.
5. Lubricate the valve stem and valve guide ID with clean engine oil.

Note: The valve stem oil seal must not come loose from the valve guide when the valve (1) is installed.

6. Insert the valve into the valve guide until it bottoms on the valve seat.

7. Position the valve spring (2) on the spring seat (1).
8. Place the valve spring retainer onto the valve spring.

Warning: Compressed valve springs (1) have high tension against the valve spring compressor (2). Valve springs that are not correctly compressed by, or are 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.

Important: Do not compress the valve springs less than 24.0 mm. Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

9. Compress the valve spring using valve spring compressor Tool No. J-8062 and adaptor Tool No. EN-46119.

Important: Ensure correct directional placement of valve collets (1) in Tool No. EN-46117 (2). The valve collets must be installed with the tapered end towards the valve stem seal.

10. With the spring compressed, install the valve collets into Tool No. EN 46117.

11. Place the collets into position by pushing the tool (1) downward and releasing tension on the valve spring compressor (2).
12. Verify the valve collets are installed by placing a rag over the valve tip and tapping with a dead-blow hammer. The valve collets and the spring should remain in place.