1989 Ski-Doo Repair Manual, Page 59Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
7Upper crankcase 2Rubber plug (2) 3Oil seal PTO side 4Shim 5Ball bearing 6206 (2) 6ring (2) 7Crankshaft 8Woodruff key 9Shim (as raquired) 70Bearing retainer
7 7Oil seal magside 72LGetite 575
73Lower crankcase 74Lock washer M6 (2) 75Screw M6 30 (2) 76Loctite 242 (blue, medium strength) 77Lock washer 22 mm 78Nut M22 79Anti-seize lubricant
NOTE: Engine must be removed from chassis to perform the following procedures
3,11, Oil seal
At seal assembly, apply light coat of lithium grease on seal lipsFor bearing lubrication purpose, gap of 1.0 mm (.040 in) must be maintained between seals and bearingsWhen installing plain seals (seal without locating ring or without spacing legs), ensure to maintain the specified gap between shim bearing retainer and the seal
CLEANING
Discard all seals, gaskets and O-ringsClean all metal components in non-ferrous metal cleanerRemove old sealant from crankcase mating surfaces with