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EAS30389
DISASSEMBLING THE CRANKCASE
1. Place the engine upside down.
2. Remove:
• Crankcase bolt (30)
TIP
• Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the
bolts are fully loosened, remove them.
• Loosen the bolts in the proper sequence as
shown.
• The numbers embossed on the crankcase in-
dicate the crankcase tightening sequence.
12
1 1
10
16
22
21
24
23
13
14
2
3
1
3. Remove:
• Lower crankcase
ECA13900
NOTICE
Tap on one side of the crankcase with a soft-
face hammer. Tap only on reinforced por-
tions of the crankcase, not on the crankcase
mating surfaces. Work slowly and carefully
and make sure the crankcase halves sepa-
rate evenly.
4. Remove:
• Dowel pins
5. Remove:
• Crankshaft journal lower bearing
• Balancer shaft journal bearing
(from the lower crankcase)
TIP
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
6
7
9
8
20
19
28
26
30
27
29
25
15
5
18
17
4
EAS30390
CHECKING THE CRANKCASE
1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
3. Check:
• Crankcase
Cracks/damage Replace.
• Oil delivery passages
Obstruction Blow out with compressed air.
EAS30397
ASSEMBLING THE CRANKCASE
1. Lubricate:
• Crankshaft journal bearing inner surface
(with the recommended lubricant)
Recommended lubricant
2. Apply:
• Sealant
(onto the crankcase mating surfaces)
Yamaha bond No. 1215
TIP
Do not allow any sealant to come into contact
with the oil gallery or crankshaft journal bear-
ings, or balancer shaft journal bearings.
30
3. Install:
• Dowel pins
5-58
CRANKCASE
Engine oil
90890-85505
(Three bond No.1215®)
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