Where is the valve oil seal?

The valve oil seal is located at the upper end of the valve guide of the engine cylinder head. Valve oil seal is also a kind of oil seal, which is vulcanized by outer frame and fluororubber. The radial opening of the oil seal is provided with a self-tightening spring or steel wire, which is used for Mei Feng of the engine valve guide rod.

The main function of valve oil seal is to prevent engine oil from entering the intake and exhaust pipes, causing engine oil loss, preventing the mixture of gasoline, air and waste gas from leaking, and preventing engine oil from entering the combustion chamber. The valve oil seal is one of the important parts of the engine valve group, which contacts with gasoline and engine oil at high temperature, so the valve oil seal also has higher requirements on materials.

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Precautions for use of valve oil seal:

1. Remove the camshaft and hydraulic tappet and store them face down. Please note that tappets are not interchangeable during operation. Remove the spark plug with a spark plug wrench, adjust the piston of the corresponding cylinder to the top dead center, and screw the pressure hose into the threaded hole of the spark plug.

2. Install the spring compression tool on the cylinder head with bolts. Adjust the relevant valves to the correct position and connect the pressure hose to the air compressor (air pressure is at least 600kPa). Press down the valve spring with the threaded mandrel and thrust piece, and remove the spring.

3. Tap valve spring retainer and remove the valve lock block. Pull out the valve stem oil seal with a tool.

4. Before installing the intake valve and exhaust valve, pay attention to coating a layer of engine oil on the valve stem.

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