Ski-Doo FORMULA S 1997, Shop Manual

Page: 71 / 926

Section 03 ENGINE
Sub-Section 03 (377, 443 AND 503 ENGINE TYPES)
03-03-6
– Screw in puller in order to remove it from pis-
ton.
– Remove piston from connecting rod.
– Install locating sleeve. Then push needle bear-
ings along with thrust washers using a 21 mm
(.826 in) diameter pusher.
1. Pusher 21 mm (.826)
NOTE : 0.25 and 0.5 mm oversized piston
and rings are available if necessary.
Use a locking tie to fasten all needles and thrust
washers along with sleeves.
INSPECTION
Refer to ENGINE DIMENSIONS MEASUREMENT
03-04.
ASSEMBLY
503 Engine
When reinstalling original needle bearings, make
sure that 31 needles are inserted between expan-
sion sleeve and locating sleeve.
1. Expansion sleeve
2. 31 needles
3. Locating sleeve
– Grease thrust washers and install them on each
end of needles.
– Using a 21 mm (.826 in) diameter pusher, insert
needles into connecting rod.
– Mount piston over connecting rod with the let-
ters “AUS” (over an arrow on the piston dome)
facing in the direction of exhaust port (see illus-
tration below).
– Install piston pin puller (P / N 529 0210 00) and
turn handle until piston pin is correctly posi-
tionned in piston.
A21C04A
1
'
A21C03A
1
2 3
A21C02A