This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. for internal combustion engine powder metallurgy oil pump rotors. This standard applies to internal combustion engine oil pumps whose working pressure is not greater than 0.5 MPa.
JB/T 7908-1999 history
1999JB/T 7908-1999 Specifications for P/M oil pump rotor of the internal combustion engines