Piston And Piston Ring Removal - Arctic Cat Cougar Service Manual

ENGINE
c. Figure 24: Liquid-cooled 435.8, 437.4,
550, 580 and 594 cc engines
d. Figure 25: Liquid-cooled 497 and 599 cc
engines
Piston and Piston Ring Removal
1. Remove the cylinder head and cylinder as
described in this chapter.
NOTE
The pistons should be marked with an
arrow cast on the top or inside, under the
crown pointing to the exhaust port.
l
171
2. Identify the pistons and cylinders by marking
on the tops of the pistons the letters PTO (left
side), MAG (right side) or CEN (middle of three-
cylinder models). In addition, keep each piston
together with its pin, bearing and piston rings to
avoid confusion during reassembly.
3. Before removing the piston, hold the rod
tightly and rock the piston as shown in Figure
46. Do not confuse any rocking motion with the
normal side-to-side sliding motion. Rocking in-
dicates wear on the piston pin, needle bearing,
piston pin bore or a combination of all three.
NOTE
Wrap a clean shop cloth under the piston
so the clip will not fall into the crank-
case.
WARNING
Wear safety glasses when peiforming
Step 4.
4. Remove the piston pin clip from the outside
of the piston (Figure 47) with needle nose pliers.
Hold your thumb over one edge of the clip when
removing it to prevent it from springing out.
5. Use a properly sized wooden dowel or socket
extension and push the pin from the piston.
CAUTION
If the engine ran hot or seized, the piston
pin may be difficult to remove, but do not
drive the piston pin from the piston.
Hammering will damage the piston, nee-
dle bearing and connecting rod.
If
the
piston pin will not push out by hand,
remove it as described in Step 6.
6. If the piston pin is tight, use a puller as shown
in Figure 48. The tool can be fabricated as
shown. Assemble the tool onto the piston and
pull the piston pin from the piston. Be sure to
install a pad between the piston and piece of pipe
to prevent damaging the piston.
NOTE
If the pin is left partly in the piston as
shown in Figure 49, the pin and piston