1989 Ski-Doo Repair Manual, Page 325Get this manual
Section 03 TRANSMISSION Sub-section 07 (CHAINCASE)
25, Gasket
Grease new gasket with petroleum jelly, or other suitable product, and install making sure gasket does not shift from it's correct positionTighten bolts evenly
NOTE: Bottom pan has an emboss below chaincase housing to ease installation
29, Chaincase oil
Remove filler cap and pour 200 ml (7 floz) of chaincase oil (PIN 413 8019 00) into chaincaseNOTE: Chaincase oil capacity is 200 ml (7 floz)