1985 Ski-Doo snowmobile Service Manual, Page 40Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
1 Head cylinder
2 Spring bracker 3Lock washer mm 4Screw M6 12 5Injecrion firring Head cylinder gasker 7Srud M8 158.5 141
8 Lock washer 8.4 mm 141
910111213 14 15
Nur M8141 Clrchp (2) SemHrapez ring Recrangular nng Pisron Gudgeon pm Needle bearmg
Use engine mounting support (PIN 420876640) to hold engine while working on
INSPECTION
The inspection of the engine top end must include the following measurements:
TOLERANCES MEASUREMENTS FITTING NEW PARTS (MAX (MIN
03 mm (0012"1 NA OS mm (0031") .04 mm (0016") 20 mm 10079"} 07 mm (002S") NA 10 mm 10039") 11 mm (0043") .35 mm 1013S")
WEAR LIMIT
Cylinder taper Cylinder out of round Cylinderpiston clearance
AOO3002001