1985 Ski-Doo snowmobile Service Manual, Page 44Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
5, Crankshaft ball bearing
Prior to Installation, place bearings into and oil container filled with oil heated to lOoDe (21 ODF) This will expand bearings and ease installationInstall outer race groove outward
Torque to N.m 180 Ibf.in)
AOO3002002
Refer to "Top end" section to complete the assembly
INSPECTION
The Inspection of the engine bottom end must include the following measurements:
TOLERANCES MEASUREMENTS FITTING NEW PARTS (MAX (MIN
WEAR liMIT
Crankshaft deflection Connecting rod big end axial play Crankshaft end play