When installing the valve oil seal, first soak the valve oil seal in engine oil for about 10 minutes, and then install the valve seat pad. The specific operation steps are as follows:

1. First soak the valve oil seal in engine oil for about 10 minutes.

2. Install the gasket of the valve seat.

3. Remove the valve oil seal from the engine oil.

4. Install the valve oil seal.

5. Press down the valve oil seal with a sleeve.

6. Install the valve oil seal.