BOMBARDIER 1983 Shop Manual page 28

SECTION 02 ENGINE
SUB-SECTION 01 (247 ENGINE TYPE)
CLEANING
Discard all oil seals and gaskets .
Clean all metal components in a non-ferrous metal clean-
er .
DISASSEMBLY
General
To remove drive pulley, refer to "Drive Pulley", section
03, sub-section 03 .
To remove magneto, refer to "Magneto" in this section.
eD
0When disassembling crankcase halves, do not
heat the crankcase. If heat is necessary, temperature
must not exceed 55°C (130°F).
o
Do not remove polyamid rings unless necessary.
To remove, heat slightly with a butane torch then pry
out using a screwdriver.
@To remove seals, push from outside the crankcase
towards the inside.
@To remove bearings from crankshaft use a protective
cap and special puller as illustrated . (See Tools Sec-
tion) .
INSPECTION
The inspection of the engine bottom end must include
the following measurements:
PAGE 28
TOLERANCES
MEASUREMENTS FITTING NEW PARTS WEAR LIMIT
(MIN.) (MAX.)
Crankshaft
NA N.A.
.10 mm
deflection
(0039")
Connecting rod big .20 mm .53 mm 10 mm
end axial play
(0079") (0208") (0394")
Connecting rod
N.A. N A. NA
alignment
Crankshaft end play
.20
mm
.40
mm
NA
(0079") (0158")
O
NOTE: For the measurement procedures, refer to
"Engine Tolerances Measurement" , section 02,
sub-section 07.
ASSEMBLY
@ Prior to installation, place bearings into an oil con-
tainer and heat the oil to 100°C (210°F) for 5 to 10 min.
This will expand bearings and ease installation.
Install bearings with groove outward .
O
NOTE: Crankshaft end-play requires adjustment
only when crankshaft and/or crankcase is replaced.
Prior to magneto side bearing installation, determine
crankshaft end-play and install required shim(s) on
crankshaft extension. For the crankshaft end-play ad-
justment procedure, refer to Engine Tolerances Mea-
surement, section 02, sub-section 07.
0To install polyamid ring, apply oil on outside diameter
then use a suitable pusher.
Polyamid ring
pusher
no 420 276 930
Crankcase half