1985 Ski-Doo snowmobile Service Manual, Page 32Get this manual
Section 02 ENGINE Sub-section 01 (247 ENGINE TYPE)
3, 12, 16, Studs or boltsnuts
Torque the nuts or bolts to 21 -m (1 Ibf-ft) following illustrated sequenceInside lip facing towards the crankcase Chamfered side towards the crankshaft bearing
AOO2002003
15, Seals
To install new seal into crankcase use an appropriate oil seal pusher as illustrated(See Tools Section!