规定飞轮壳的标称尺寸和公差，尤其是影响与配合零件互换性的尺寸和公差。建议商用车辆和客车使用尺寸代码为1至4的飞轮壳。一些图说明了关注的形状和参考数量。适用于往复式内燃机，飞机和乘用车发动机除外。

Specifies the nominal dimensions and tolerances of flywheel housings, in particular those which affect interchangeability with mating parts. Flywheel housings of size codes 1 to 4 are recommended for commercial vehicles and buses. Some figures illustrate shapes and reference quantities of concern. Applies to reciprocating internal combustion engines except engines for aircraft and passenger cars.