1970-1979 Ski-Doo Snowmobiles Service Manual, Page 60Get this manual
ENGINE NOTE: Be sure that the hole in plastic flange aligns with vacuum port on engineflange
Fan Cowl, Fan, and Magneto Assembly RemovalInstallation The following procedure requires the use of special tools to remove magneto platefan assemblyIf special tools or locally fabricated equivalents are not available, refer task to an authorized dealer1Remove engine and recoil starter2Remove electric starter on models so equipped3Remove nuts securing starting pulley to magneto plate (Figure 7) and remove pulley4Remove fan cowl assembly from engine (Figure 8)5Using hammer and small punch, bend back locking tab securing magneto nut6Using special tool to hold fan, remove nut and washer securing magneto platefan housing assembly as shown in Figure 97Install special puller and tighten until magneto platefan assembly is removed from crankshaft (Figure 10)CAUTION