Engine Tolerance Measurements - BOMBARDIER 1982 Shop Manual

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SECTION 02 ENGINE
SUB-SECTION 08 (ENGINE TOLERANCES MEASUREMENT)
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ENGINE TOLERANCES MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (.003")
Compare cylinder
~iameter
16 mm
(5/8")
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 ex-
ceeds 0.08 mm (,003") the cylinder should be rebored
and honed or should be replaced.
Below the
intake port
,
1 1 1 1 T 1 6 m m
16 mm
from top
CYLINDER OUT OF ROUND
Maximum: 0.05 mm (.002")
Measuring 16 mm
(5/8")
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.
16mm
:L
T
Gudgeon
pin
direction
Measures to
be compared
CYLINDER/PISTON CLEARANCE
ENGINE PISTON TO WALL CLEARANCE
TYPE MINIMUM - MAXIMUM
247
0.065 - 0.200 mm
(,0026 - 008")
277
0.070 - 0.200 mm
(,0028 - .008")
354
0.080 - 0.180 mm
(,0031 - .007")
377
0.070 - 0.200 mm
(,0028 - .008")
454
0.10 - 0.200 mm
(,004 - .008")
464
0.080 - 0.200 mm
(,0031 - .008")
503
0.070 - 0.200 mm
(,0028 - .008")
640
0.080 - 0.220 mm
(,0031 - .0086")
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
(5/8")
below its top edge.
PAGE 171