Ski-Doo Formula 500 1998, Shop Manual

Page: 88 / 398

Section 04 ENGINE
Subsection 02 (443 AND 503 ENGINE TYPES)
04-02-7
1. Pusher 21 mm (.826 in)
Use a locking tie to fasten all needles and thrust
washers along with sleeves.
NOTE: The PTO cylinder or fan housing have to
be removed to give access to MAG piston pin
with the puller.
NOTE: 0.25 and 0.5 mm oversize piston and rings
are available if necessary.
503 Engine
Place a clean cloth over crankcase to prevent cir-
clips
no. 15 from falling into crankcase. Then with
a pointed tool inserted in piston notch, remove cir-
clip from piston
no. 13 .
To remove piston pin no. 14 , use piston pin puller
(P/N 529 0210 00) as follows:
– Fully screw puller handle.
– Insert puller end into piston pin.
– Screw (LH threads) extracting nut.
– Hold puller firmly and rotate puller handle coun-
terclockwise to pull piston pin.
NOTE: The PTO cylinder or fan housing have to
be removed to give access to MAG piston pin
with the puller.
NOTE: 0.25 and 0.5 mm oversize piston and rings
are available if necessary.
INSPECTION
Refer to ENGINE DIMENSIONS MEASUREMENT
04-04.
ASSEMBLY
443 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.
A21C04A
1
A01B1AA
A21C03A
1
2 3