This also allowed more space to model the external valve gear.

There are many variations in the location of the valve gear.

There was no inside valve gear to worry about, however.

As of December 2011 work is progressing on the valve gear.

I have been told it could be an oil feed problem to the valve gear, but the pipe is clear.

This makes control of the valve gear easier for the driver.

The engines had an external frame with outside drive and valve gear.

Therefore, an alternative type of valve gear had to be found.

The valve gear took a similar route to the drive.

The main gasoline engine can be turned and its valve gear operates.