气门杆间隙过大会加速气门的积炭。
制动蹄与制动鼓之间的间隙过大或蹄油。
气门过热或遭受重载（气门杆间隙过大或爆裂）均可造成气门破裂。
Valve Breakage. Any condition that causes the valve to overheat or to be subjected to heavy pounding (as from excessive tappet clearance or from detonation ) may cause valves to Break.
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