BOMBARDIER 1982 Shop Manual page 106

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SECTION 02 ENGINE
SUB-SECTION 05 (464 ENGINE TYPE)
CLEANING
Discard all gaskets.
Clean all metal components in a non-ferrous metal clean-
er.
Scrape off carbon formation from cylinder exhaust port,
cylinder head and piston dome using a wooden spatula.
O NOTE: The letters "AUS" (over an arrow on the
piston dome) must be visible after cleaning.
Clean the piston ring grooves with a groove cleaner
tool, or with a piece of broken ring.
DISASSEMBL Y
@@ @ Place a clean cloth over crankcase to prevent
circlips from falling into crankcase then use a pointed
tool to remove circlips from piston .
Drive the gudgeon pins in or out using a suitable drive
punch and hammer.
_ CAUTION: When tapping gudgeon pin in or out
" of piston, hold piston firmly in place to eliminate
the possibilities of transmitting shock and pressure to
the connecting rod.
INSPECTION
The inspection of the engine top enD must include the
following measurements:
TOLERANCES
MEASUREMENTS FiniNG NEW PARTS WEAR LIMIT
(MIN.) (MAX.)
Cylinder taper
N.A. N.A.
.08 mm
(,0031")
Cylinder out of
N.A. N.A.
.05 mm
round
(,0020")
Cylinder / piston
.08 mm .10mm .20 mm
clearance
(,0031") (,0039") (,0079")
Ring / piston groove .04 mm .11 mm .20 mm
clearance (,0016")
(,0043")
(,0079")
Ring end gap
.20 mm .35 mm 1.0mm
(,0079") (,0138") (,0394")
O
NOTE: For
~he
measurement procedures, refer to
. "Engine Tolerances Measurement", section 02,
sub-section 09.
PAGE 104
ASSEMBLY
@At assembly, place the pistons over the connecting
rods with the letters AUS (over an arrow on the piston
dome) facing the direction of the exhaust port.
EXHAUST
@To minimize the effect of acceleration forces on cir-
clip, install each circlip so the circlip break is at 6 o'clock
as illustrated.
Using very fine emery cloth, remove any burrs on piston
caused through circlip installation .
Piston notch
--+----++-ifPo,o:::--~"Jj
Circlip break
@@
Because of cap nuts, cylinder studs have to be
screwed into the crankcase so that they do not protrude
by more than 57.5 mm (2.260").
Apply "Loctite 242" on the threaded end of the studs
going into the crankcase.