BOMBARDIER 1982 Shop Manual page 164

SECTION 02 ENGINE
SUB-SECTION 07 (640 ENGINE TYPE)
CLEANING
Discard all oil seals, gaskets, "0" rings and sealing
rings .
Clean all metal components in a non-ferrous metal clean-
er.
Remove old sealant from crankcase mating surfaces with
Bombardier sealant stripper.
_ CAUTION: Never use a sharp object to scrape
... away old sealant as score marks incurred are de-
trimental to crankcase sealing .
DISASSEMBL Y
General
To remove drive pulley, refer to "Drive Pulley", section
03, sub-section 03.
To remove magneto, refer to "Magneto" in this section.
@
To remove starter gear from crankshaft it may be ne-
cessary to use a special puller as illustrated. (See Tools
Section) .
Starter gear puller
@To remove bearing from crankshaft, use a protective
cap and special puller, as illustrated . (See Tools Sec-
tion).
Special puller
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INSPECTION
The inspection of the engine bottom end must include
the following measurements:
TOLERANCES
MEASUREMENTS FITTING NEW PARTS
WEAR LIMIT
(MIN.) (MAX.)
Crankshaft
N.A. N.A.
.08 mm
deflection (0031")
Connecting rod big .20 mm .53 mm
1.0 mm
end axial play 1.0079") 1.0208") 1.0394")
Conn ecting rod
N.A. N .A . N .A.
alignment
Crankshaft end play .20 mm .40 mm
N.A .
1.0079") 1.0158")
O NOTE: For the measurement procedures, refer to
"Engine Tolerances Measurement", section 02,
sub-section 09 .
ASSEMBLY
@Prior to installation, place bearings into an oil con-
tainer and heat the oil to 100 D C (210 D 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 crank-
shaft extension . For the crankshaft end-play adjustment
procedure, refer to Engine Tolerances Measurement.
section 02, sub-section 09 .
@At seal assembly, apply a light coat of lithium grease
on seal lip. To ensure adequate bearing lubrication, seal
outer surface should be flush with crankcase.
@At assembly on crankcase, apply "Loctite 242" or
equivalent on threads.
@Torque to 44 N.m (32 ft -Ibs) .
CD CD ®
Crankcase halves are factory matched and there-
fore, are not interchangeable or available as single halves.
Prior to joining of crankcase halves, apply "Loctite 515"
(no . 4137027) on mating surfaces.
Position the crankcase halves together and tighten nuts
(or bolts) by hand then install armature plate (tighten)
on magneto side to correctly align the crankcase halves.