Arctic Cat Sno Pro 120 2011, Service Manual

Page: 86 / 535

2-48
2. Lightly grease the inner lips of the crankshaft seals;
then slide them onto the crankshaft.
3. Apply oil to the crankshaft bearings; then install the
crankshaft into the upper crankcase half. Be sure the
alignment hole in each bearing is positioned over its
respective dowel pin in the crankcase; then seat the
crankshaft.

NOTE: To check the bearing for proper position,
place the point of a sharp tool into the dimple found
in the bearing race. Strike the tool with the palm of
the hand in either direction. If the bearing moves, it
isn’t positioned correctly and must be rotated until it
drops onto the dowel pin.

NOTE: Make sure the crankshaft center C-ring (inte-
gral with the center seal) is properly positioned in the
groove of the upper crankcase half.
4. Install the four crankcase dowel pins.
5. Evenly apply a thin coat of Three Bond Sealant to the
entire bottom half crankcase sealing surface.

NOTE: Use only Three Bond Sealant to seal the
crankcase halves.
MD0203
6. Install crankcase lower half. Install eight 8 mm and
four 6 mm cap screws. Tighten the 8 mm cap screws
in two steps to 17 ft-lb and the 6 mm cap screws to
96 in.-lb using the pattern shown.
737-027A
MD0212

NOTE: Check the reed valve on each cylinder. Make
sure they are clean and closing completely.
7. Install the piston rings on each piston so the letter on
the top (inclined surface) of each ring faces the dome
of the piston.
726-306A
MD0271
8. Lubricate the piston pin bearings and install them
into the connecting rods.
CAUTION
If the bearings are not properly seated during assembly,
the crankcase halves will not seal tightly and severe
engine damage will result.
CAUTION
Incorrect installation of the piston rings will result in
engine damage. Always replace rings as a complete set.
Manual
Table of Contents