GA Engines
1. Remove the cylinder head cover.
2. Remove the camshaft.
3. Remove the valve spring (see section "Cylinder head").
4. Remove the old valve stem seal using a suitable tool.
The piston of this cylinder must be set to TDC to prevent the valve from falling.
5. Apply engine oil to the new valve stem seal and press it on using a suitable press.
SR Engine
1. Disconnect the throttle cable.
2. Remove the cylinder head cover and oil separator.
3. Remove the camshafts and sprockets (see section "Timing drive"),
4. Remove the spark plugs.
5. Apply compressed air at a pressure of approximately 490 kPa (5 kgf/cm²) through the spark plug hole.
6. Remove the valve drive lever, lever guide and washer.
7. Remove the valve spring using a special tool.
The piston of this cylinder must be set to TDC to prevent the valve from falling.
8. Remove the old valve stem seal using pliers.
9. Apply engine oil to the new valve stem seal and press it in using a suitable press.
CD Engines
1. Remove both timing belts.
2. Remove the pulleys and camshaft covers.
3. Remove the camshaft bearing caps by loosening the nuts from the center to the edges in two or three steps.
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4. Remove the camshaft with seals.
5. Remove the valve lifters, marking them to avoid confusion during installation.
6. Replace the valve stem seals as follows:
- a) Set the piston of the 1st cylinder to TDC.
- b) Remove the valve springs and the old valve stem seals from cylinders 1 and 4. It is not necessary to remove the spring seats.
- c) Press on new valve stem seals for cylinders 1 and 4. Install springs (the narrow pitch side should face the cylinder head).
- d) Install the spring retainers on the intake valves and the rotators on the exhaust valves.
- e) Set the piston of the 2nd cylinder to TDC.
- f) Replace the oil seals of the 2nd and 3rd cylinders in the same way as in points b) and c).
- g) Install the valve lifters in their original positions.