CRANKCASE
5-71
EAS30389
DISASSEMBLING THE CRANKCASE
1. Place the engine upside down.
2. Remove:
• Crankcase bolt (×27)
• 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 “1”–“11” in any loosening se-
quence.
• Loosen the bolts “12”–“27” in the proper se-
quence as shown.
• The numbers embossed “1”–“16” on the crank-
case indicate the crankcase tightening se-
quence.
•M6 × 40 mm bolt (×8): “1”, “2”, “4”–“7”, “10”,
“11”
•M6 × 60 mm bolt (×3): “3”, “8”, “9”
•M6 × 65 mm bolt (×2): “12”, “13”
•M8 × 65 mm bolt (×2): “14”, “15”
•M8 × 70 mm bolt (×6) (bolts with O-rings):
“16”– “21”
•M9 × 80 mm bolt (×6) (bolts with washers):
“22”–“27”
3. Remove:
• Crankcase
• Dowel pins
ECA13900
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.
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)
2. Apply:
• Sealant
(onto the crankcase mating surfaces)
ECA20880
Do not allow any sealant to come into con-
tact with the oil gallery, crankshaft journal
bearings, or balancer shaft journal bearings.
×8
×3
×2
×6
×2
×6
17
18
23
24
21
20
27
26
15
12
22
25
16
19
8
9
13
7
6
11
10
14
21
4
3
5
Recommended lubricant
Engine oil
Yamaha bond No. 1215
90890-85505
(Three bond No.1215®)
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