Piston Inspection - Polaris 1999 Sportsman 400 Service Manual

ENGINE TO P END
t
125
the piston pin, piston, connecting rod bore or,
III
most cases, a combination of all of three.
NOTE
Do
1101
reuse tire piston pin retaining
clip s. The clips are damaged during
removal and severe engine damage
will result
if
a clip becomes loose
while the engine is running.
3. Cover the cra nkcase with a clean shop cloth (A,
Fig u re 125) to prevent the piston pin retaining clip
from falling into the crankcase.
4. Remove the retaining clip (B, Figu re 125) from
each side of the piston pin bore. Be ca reful to pre-
vent the clip from springing out.
5. Use a proper size wooden dowel or suitable tool
(Figure 126) to push the piston pin from the bore in
the piston .
CAUTION
Be carefu l when removing the piston
pin to (B'oM dama ging the connecting
rod. The piston must be supported
when eitherpushing or pulling the pin
} i' O lII
the pis ton pill bore. Be sure that
lateral loads are not transmitted to
the lower co nnecting rod bearing.
6. Lift the piston from the connecting rod .
NOTE
If
the piston is
/ 0
be left offfo r some
time. protect the connecting rod
by
placing a piece of fo am insulation
tube over its end. Place a clean.
lim-free sho p towel around the con-
necting rod to keep dirt
f rom
entering
the crankcase.
Piston Ins pection
II
1. If neces sary,
remove
the piston rings as de-
scribed in this c hapter.
2. Carefully clean the carbon from the piston
crown with a so ft scraper or wire wheel mounted in
a drill . Large carbon accumu lations reduce piston
cooling and result in detonation and piston damage.
CAUTION
Be careful
not to
gouge
or
otherwise
damage the piston when removing
carbon. Never lise a wire brush to
clean
the
piston
skirt or
ring
grooves.