BOMBARDIER 1982 Shop Manual page 56

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SECTION 02 ENGINE
SUB-SECTION 03 (377 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.
DISASSEMBLY
@
@
@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 .
IN SPECTION
The inspection of the engine top end must include the
following measurements:
TOLERANCES
M EA SUR EMENTS FITTING NEW PARTS
WEAR LIMIT
(MIN.) (MAX .)
Cylinder taper
NA N.A.
.08 mm
1.0032")
Cylinder out of
NA NA
.050 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")
Ring end gap .20 mm .35 mm 1.0mm
1.0079") 1.0138") 1.0394")
O
~OTE:
For the measurement procedures, refer to
Engine Tolerances Measu rement", section 02,
sub-section 09 .
PAGE 56
ASSEMBLY
@At assembly , place the pi.ston 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 in-
stallation using very fine emery cloth .
Piston notch
I-----tf-fll:-'~__:::~
Circ lip break
CD
@'®
At cylinder and/or cylinder head installation,
use P /N 420 876 171 aligning tool to secure sealing of
intake manifold and exhaust (See Tools section), before
tightening cylinder head nuts .
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