This standard specifies the dimensions necessary for the installation and interchangeability of "S" size I-threaded injector bodies on automotive diesel engines. The positions of the oil inlet and oil return joints are not limited and are determined by each manufacturer according to the purpose.
QC/T 543-1999 history
1999QC/T 543-1999 Type I Thread Mount Injector Body for Automotive Diesel Engine "S" Size