Ski-Doo Formula S 1998, Shop Manual

Page: 93 / 338

Section 04 ENGINE
Subsection 03 (377, 443 AND 503 ENGINE TYPES)
04-03-8
1. Piston notch
2. Circlip break at 6 o’clock
NOTE: Be sure to restore the chamfer around all
cylinder sleeve port openings.
Before inserting piston in cylinder no. 4 , lubricate
the cylinder with new injection oil or equivalent.
Install proper ring compressor on piston assem-
bly.
NOTE:
The ring compressor will not fit on over
size pistons.
Check flatness of intake sockets
no. 6
. Refer to
ENGINE DIMENSION MEASUREMENT 04-04
and look for
checking surface flatness .
At cylinder no. 4 and/or cylinder head no. 3 instal-
lation, use aligning tool or exhaust manifold itself
to ensure sealing of intake manifold and exhaust
before tightening cylinder head nuts.
1. Or use exhaust manifold to align cylinders
-
CAUTION
Circlips must not move freely in the groove
after installation. If so, replace them.
ENGINE TYPE
RING COMPRESSOR
P/N
377 and 443 420 8760 90
503 420 8769 70
1
2
A01C02A
ENGINE TYPE
ALIGNING TOOL
P/N
377, 443 and 503 420 8761 71
A17C01A
420 8761 71
A17C02A
1