问题描述：
[单选]
As to the bearing， of the following， which statement is not true？
A．ff overheat is found, the engine must be stopped for inspection
B．Much heat of the crankcase door indicates that the bearing is overheated
C．If bearing clearance is too large, knocking will be heard in the crankcase
D．If bearing clearance is too large or too small, the white metal may be melted
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