Ski-Doo FORMULA III, Shop Manual

Page: 119 / 356

Section 04 ENGINE
Sub-Section 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-8
CONNECTING ROD / CRANKPIN
CLEARANCE
CRANKSHAFT END-PLAY
247 and 277 Engine Types
Adjustment
Crankshaft end-play is adjusted with shims locat-
ed between crankshaft and magneto side bear-
ing.
1. Distance ring 4. PTO
2. Shim location 5. MAG
3. Bearing
CAUTION : Always install end-play ad-
justment shims on the magneto side be-
tween bearing and crankshaft counterweight.
The following is required for the adjustment
procedure :
– adjustment shims (refer to parts catalog)
thicknesses available : 0.10 mm (.004 in)
0.20 mm (.008 in)
0.30 mm (.012 in)
0.50 mm (.020 in)
1.00 mm (.040 in)
– micrometer
– vernier
Total shim thickness needed for the end-play ad-
justment is determined with the following
procedure :
a. Measure crankcase halves as illustrated (M
1
and M
2
).
A standard compressed crankcase gasket will
have a 0.30 mm (.012 in) thickness (M
3
). Add
these measurements to obtain dimension A .
1. Bearing seat
b. Measure the thickness of each bearing (M
4
and
M
5
).
ENGINE
TYPE
NEW PARTS
MIN. – MAX. WEAR
LIMIT
All
0.03 – 0.012 mm
(.0001 – .0005 in)
0.015 mm
(.0006 in)
ENGINE
TYPE
NEW PARTS
MIN. – MAX. WEAR
LIMIT
247
0.020 – 0.032 mm
(.0008 – .0013 in)
0.05 mm
(.0020 in)
277
0.020 – 0.030 mm
(.0008 – .0012 in)
377, 443 and
503
0.020 – 0.033 mm
(.0008 – .0013 in)
454, 494, 582,
583, 670 and
779
0.038 – 0.050 mm
(.0015 – .0020 in)
0.06 mm
(.0024 in)
ENGINE TYPE MINIMUM MAXIMUM
247 and 277
0.10 mm
(.004 in)
.030 mm
(.012 in)
A01C1NA
3
1
5
4
2
-
A01C0TA
1