Spark

Cylinder Head Assemble

Special Tools

For equivalent regional tools, refer to Special Tools .

Note: NEVER reuse a valve stem oil seal (2). Always use new seals when assembling the cylinder head.

1. Mount a new valve stem oil seal (2) using the EN 46116 valve stem seal remover/installer .

Note: Force should only be applied to the valve spring contact area of the new valve stem oil seal (2) during installation.

2. Push and twist the valve stem oil seal (2) into position on the valve guide until the seal positively locks on the guide using the EN 46116 valve stem seal remover/installer .
3. 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 is installed.

4. Insert the valve (1) into the valve guide until it bottoms on the valve seat.



5. Install the valve spring (2).
6. Place the valve spring retainer (1) onto the valve spring (2).




Warning: 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.

Caution: Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

7. Compress the valve spring using the EN 46569 valve spring compressor - head off and the EN 49075 valve spring compressor adapter .

Note: Ensure correct directional placement of valve collets. The valve collets must be installed with the tapered end towards the valve stem seal.

8. With the spring compressed, install the valve collets.
9. Remove the EN 46569 valve spring compressor - head off and EN 49075 valve spring compressor adapter .
10. Verify that the valve collets are installed by placing a rag over the valve tip and tapping with a dead-blow hammer. The valve keepers and the spring should remain in place.