BOMBARDIER 1982 Shop Manual page 38

SECTION 02 ENGINE
SUB-SECTION 02 (277 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
CD
® ®
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.
INSPECTION
The inspection of the engine top end must include the
following measurements:
TOLERANCES
MEASUREMENTS
FITTING NEW PARTS
WEAR LIMIT
(MIN.) (MAX.)
Cylinder taper
N.A. N.A.
0.8 mm
1.0031")
Cylinder out of
N.A. NA
.05 mm
round
1.0018")
Cylinder / piston
.07 mm .09 mm
.20 mm
clearance
1.0028")
1.0035") 1.0079")
Ring/piston groove .04 mm
.11 mm
.20 mm
clearance
1.0016") 1.0043")
1.0079")
Rin9 end gap
.20 mm
.35 mm 1.0mm
1.0079")
1.0138") 1.0394"1
O
NOTE: For the measurement procedures, refer to
"Engine Tolerances Measurement", section 02,
sub-section 09.
PAGE 38
ASSEMBLY
CDAt assembly, place the piston over the connecting
rod with the letters" AU S" (over an arrow on the piston
dome) facing in 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. Remove any burrs on piston caused through
circlip installation with very fine emery cloth.
Piston notch ~---++~"""----::J"'lj
Circlip break
@Position insulating rubber as illustrated.
)