Engine Tolerance Measurements - BOMBARDIER 1980 Shop Manual

SECTION 03
SUB-SECTION 01, (ENGINE TOLERANCES MEASUREMENT)
CYLINDER TAPER
ENGINE TOLERANCES MEASUREMENT
PISTON TO WALL CLEARANCE
Maximum: 0.08 mm (.003")
Compare cylinder diameter 16 mm (i") from top of
cylinder with down to just below the intake port.
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
16
mm
from top
CYLINDER OUT OF ROUND
Maximum: 0.05 mm (.002")
Measuring 1 6 mm (i") 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.
Gudgeon
p,n
direction
Measures to
be compared
ENGINE
PISTON TO WALL CLEARANCE
TYPE MINIMUM - MAXIMUM
247 0.065
- 0.200 mm
(0026 - .008")
277
0.060 - 0.200 mm
(0024 - .008")
354 0.080 - 0.180 mm
(.0031
-
.007")
377
0.070 - 0.200 mm
(0028 - .008")
444
0.070
- 0.200 mm
(0028 -
.008")
454
0.090 - 0.200 mm
(0035 - .008")
464 0.070 - 0.200 mm
(0028 - .008")
503 0.060
- 0.200 mm
(.0024 - .008")
640
0.070
- 0.220 mm
(.0028 - .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 (i") below its top edge.
' - I)
I.
(
'0'
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(ENGINE TOLERANCES MEASUREMENT). PAGE 1