Ski-Doo FORMULA 500 1997, Shop Manual, Page: 83 / 352

Section 03 ENGINE
Sub-Section 03 (454, 494, 583 AND 670 ENGINE TYPES)
03-03-12
454 AND 670 ENGINES — EXHAUST SIDE
1. Drive pins
3,7, Seal
At seal assembly, apply a light coat of lithium
grease on seal lips.
For bearing lubrication purpose, a gap of 1.0 mm
(.040 in) must be maintained between seals and
bearings.
When installing plain oil seals (seal without locat-
ing ring or without spacing legs), ensure to main-
tain a 1.0 mm (.040 in) gap. For seals with spacing
legs, install them against the bearing.
1. Bearing
2. Oil seal
A. 1 mm (.040 in)
1,8, Upper Crankcase and Lower
Crankcase
Crankcase halves are factory matched and there-
fore, are not interchangeable or available as single
halves.
Prior to joining of crankcase halves, spray some
new injection oil (or equivalent) on all moving
parts of the crankshaft. Spray Primer N (P/N 413
7081 00) on one of mating surfaces. Let it dry for
10 to 20 minutes.
Apply paste gasket (P/N 413 7027 00) no. 5 on the
other mating surface.
NOTE: Primer N allows Loctite 515 to fully
cure on aluminum surfaces. It increases fill-
ing capacity and reduces curing time.
Position the crankcase halves together and tight-
en screws by hand then install and tighten arma-
ture plate on magneto side to correctly align
crankcase halves. Apply Loctite 242 on screw
threads and under head. Torque screws as speci-
fied following illustrated sequence.
1. Follow sequence shown 1 to 14: Torque to 29 N•m (21 lbf•ft)
15 and 16: Torque to 10 N•m (90 lbf• in )
-
CAUTION
Make sure drive pins of bearings are on ex-
haust side of crankcase for proper seating in
recesses.
A06C1MA
1
A16C0JA
1
A
2
-
CAUTION
Before joining crankcase halves be sure that
crankshaft rotary valve gear is well engaged
with rotary valve shaft gear.
'
A24C0OA
11 1 3 9 5 13
14 6 10 2 4 12 8 16
1
15 7