ISO 7649:1991 Preview
Clutch housings for reciprocating internal combustion engines -- Nominal dimensions and tolerances
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
Specifies the nominal dimensions and tolerances which affect the interchangeability between clutch housings for spring-loaded clutches and mating parts. All other dimensions and tolerances are left to the discretion of the component manufacturer. Does not apply to engines for aircraft and passenger cars; it may be used for other engine applications where no specific International Standard exists. Clutch housings of size codes 1 to 4 in table 1 are recommended for commercial vehicles and buses.
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