1989 Ski-Doo Repair Manual, Page 56Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
NOTE: 0.25 and 0.5 mm oversize pistons and rings are available if necessaryCentering tool
(p IN 529 0091 00)
INSPECTION
The inspection of the engine top end must include the following measurements:
TOLERANCES MEASUREMENTS FITTING NEW PARTS (MAX (MIN .03 fTlfTl (.0012") N.A0.08 mm 1.0031 ") .04 mm (,002") 0.07 mfTl (,0028") NA 0.10 rnrn (.0039") 0.11 mm (.004") 0.35 mm 1.014") WEAR LIMIT
Cylinder taper Cyl nder out of round Cylinder piston clearance Ring piston groove clearance Ring end gap
N.AA001 001 064
0 10 rnm (.0039") 0.70 mm 1.008")
NOTE: The circlip on the opposite side can be installed before pin installation, the tool will easily go outTo minimize the effect of acceleration forces on circlip, install each circiip so the circiip break is at o'clock as illustratedUse piston circlip installer (P IN b29 0086 00) Piston circiip installer (p 529 0086 00)