Section 04 ENGINE
Subsection 03 (494, 583 AND 670 ENGINE TYPES)
04-03-12
Install bearing drive pins
no. 2
as illustrated.
670 ENGINE — 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 filling 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
146102412816
1
15 7
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