BOMBARDIER 1980 Shop Manual page 56

SECTION 03
SUB-SECTION 02 (ENGINES)
TOP lEND
CLEANING
Discard all gaskets.
Clean all metal components in a non-ferrous metal
cleaner.
Scrape off carbon formation from cylindre 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.
DISASSEMBLY & ASSEMBLY
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Place a clean cloth over crankcase to prevent
circlips from falling into crankcase. Use a pointed tool
to remove circlips from piston .
. . , CAUTION: When tapping out gudgeon pins, hold
. . piston firmly in place to eliminate the possibilities
of transmitting shock and pressure to the connecting
rod,
At assembly, place the piston over the connecting rod
with the letters" AUS" (over an arrow on the piston dome)
facing in direction of the exhaust port.
EXHAUST
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Once the circlips are Installed turn each circlip so the
circlip break is not directly on piston notch, Remove any
burrs on piston caused through circlip installation with
very fine emery cloth.
p"ton notch
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clrclip break
(277 ENGINE TYPE), PAGE 8
Cylinder to wall clearance should be:
MINIMUM - MAXIMUM
0.060 - 0,200 mm
(.0024) - (,008")
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Position cylinder head on cylinder with nuts and
push cylinder towards magneto while cross torquing nuts
to 21 Nom (15 ft-Ibs).
Push cylinder towards magneto
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Position insulating rubber as illustrated,
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