Ski-Doo Formula S 1998, Shop Manual

Page: 103 / 338

Section 04 ENGINE
Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-6
ENGINE DIMENSION MEASUREMENT
This section covers all engine types.
CYLINDER TAPER
Compare cylinder diameter 16 mm (5/8 in) from
top of cylinder to just below its intake port area.
On rotary valve engines, measure just below aux-
iliary transfer port, facing exhaust port. If the dif-
ference exceeds the specified dimension the
cylinder should be rebored and honed or should
be replaced.
NOTE: Be sure to restore the chamfer around all
cylinder sleeve port openings.
1. Below the intake port
A. 16 mm (5/8 in) from top
CYLINDER OUT OF ROUND
Measuring 16 mm (5/8 in) from top of cylinder
with a cylinder gauge, check if the cylinder out of
round is more than the specified dimension. If
larger, cylinder should be rebored and honed or
should be replaced.
NOTE: Be sure to restore the chamfer around all
cylinder sleeve port openings.
1. Piston pin position
2. Measures to be compared
A. 16 mm (5/8 in)
USED PISTON MEASUREMENT
Using a micrometer, measure piston at A perpendic-
ularly (90°) to piston pin.
1. Measuring perpendicularly (90º) to piston pin axis
A. See table below
The measured dimension should be the same as
the one scribed on piston dome. If not, install a
new piston.
ENGINE TYPE MAXIMUM
All 0.08 mm (.003 in)
ENGINE TYPE MAXIMUM
All 0.05 mm (.002 in)
A01C53A
1
A
ENGINE TYPE
DIMENSION A
mm (in)
277 and 503 18 (.71)
337 and 503 20.8 (.82)
A01C54A
2
1
A
F01D0NA
1
A