Engine Dimensions Measurement; Cylinder Taper; Cylinder/Piston Clearance - BOMBARDIER Skandic 377 IR Shop Manual

SECTION 02 ENGINE
SUB-SECTION 08 (ENGINE DIMENSIONS MEASUREMENT)
ENGINE DIMENSIONS MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (.003")
Compare cylinder diameter 16 mm
(5/S")
from top of
cylinder to just below its intake port area.
On rotary valve engines, measure just below auxiliary
transfer port, facing exhaust port. If the difference exceeds
0.08 mm (.003") the cylinder should be rebored and
honed or should be replaced.
Below the
intake port
~lil~16mm
16 mm
from top
CYLINDER OUT OF ROUND
Maximum: 0.05 mm (.002")
Measuring 16 mm
(5/S")
from top of cylinder with a
cylinder gauge, check if the cylinder out of round is more
than 0.05 mm (.002"). If larger, cylinder should be
rebored and honed or should be replaced.
16
mm
~
sa
A
Gudgeon
pin
direction
Measures to
be compared
CYLINDER/PISTON CLEARANCE
ENGINE
PISTON TO WALL CLEARANCE WEAR
TYPE MINIMUM - MAXIMUM
LIMIT
247
0.065 - 0.200 mm
0.20
mm
(0026 -OOS") 100079")
277
0 .070 - 0.090
mm
0.20 mm
(002S - .0035") 10.0079")
377
O.OSO - 0.10
mm
0.20 mm
(0031 - .0039")
100079")
447
O.OSO - 0.10 mm
0.20 mm
(0031 - .0039") 100079")
462
O.OSO - 0.100
mm
0.20
mm
(0031 - .0039") 10.0079")
503
0.070 - 0.090
mm
0.20 mm
(002S - .0035 ") 10.0079")
534
0.100 - 0.120
mm
0.20 mm
1.0039 -0047")
(0.0079")
Measurement
To determine piston to wall clearance, the piston should
be measured right under the axis hole and the cylinder
should be measured 16 mm
(5/ S")
below its top edge.
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