Re: oil in valve chamber
That's why the dam at the front of the valve chamber (by the timing gear) is important. It allows the oil in the valve chamber to rise to the level of the dam before spilling over onto the timing gear. This allows the oil to fill the rear of the chamber. If the dam is damaged (which can happen if someone isn't careful when changing a timing gear, and tries prying it off, using the dam as a fulcrum) and the oil level can't rise high enough, you can starve the rear main of oil.
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