AD Boivin 2002 Snow Hawk, Service Manual

Page: 59 / 173

ENGINE / CYLINDERS AND CYLINDER HEADS 7 - 9
Play between the cylinder and the piston
Before measuring the play between the piston and the
cylinder, verify the taper and the ovalization of the cylinder.
To determine exactly how much play there is between the
piston and the cylinder, measure the piston under the pin
opening and at a 90
0
angle to the piston pin. Note the larger of
the two diameters.
Measure the cylinder 16 mm (5/8 in) from its upper edge. Note
the smaller of the two diameters.
The difference between these two measurements must be less
than 0.2 mm (.008 in).
Play between the piston ring and the groove
Using a thickness gauge, measure the play between the
rectangular piston ring and its groove. Replace the piston if
this play exceeds 0.2 mm (.008 in).
Opening of the piston ring
Place the piston ring halfway between the transfer port and the
intake port.
l
NOTICE:
To put the ring in the cylinder correctly, use the piston to push
it in.
Using the thickness gauge, check the opening of the ring.
Replace the piston ring if it is more than 1 mm (0.39 in).
Transfer port
Intake port