1972 Ski-Doo Shop Manual, Page 95Get this manual
GEAR BOX
12Install new "0" ring on tensioner and posi tion tensioner into housing13On tensioner, slide washer (32.2mm dia, needle cage bearing, tensioner sprocket and washer (32mm diaLock assembly with circlip (fig1-13-54)INSTALLATION
1Prior to installing gear box on vehicle, ensure that spacer has remained on drive axle (fig1-13-56)