Engine Tolerances Measurement - BOMBARDIER 1983 Shop Manual

SECTION 02 ENGINE
SUB-SECTION 07 (ENGINE TOLERANCES MEASUREMENT)
ENGINE TOLERANCES MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (.003")
Compare cylinder diameter 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.
8elow the
intake port
16 mm
from top
CYLINDER OUT OF ROUND
Maximum: 0.05 mm (.002")
16mm
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
Gudgeon
pin
direction
J...-
l ~I;lr-r
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 - 0.090 mm
(,0028 - .0035")
377
0.080 - 0.10 mm
(,0031 - .0039")
464
0.080 - 0.100 mm
(,0031 - .0039")
503
0.070 - 0.090 mm
(,0028 - .0035")
534
0.100 - 0.120 mm
(, 0039 - .0047")
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.
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