Disassembling The Crankcase; Checking The Crankcase; Checking The Bearings And Oil Seal; Checking The Oil Delivery Pipe And Oil Pipe - Yamaha XV19SX(C) Service Manual

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DISASSEMBLING THE CRANKCASE

1. Remove:
• Crankcase bolts
NOTE:
• 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 decreasing numerical order
(refer to the numbers in the illustration).
• M8 × 90 mm bolts: "1", "2"
• M8 × 65 mm bolt: "3"
• M6 × 100 mm bolts: "4", "9"–"11"
• M6 × 80 mm bolt: "12"
• M6 × 70 mm bolts: "13"–"16"
• M6 × 60 mm bolts: "5"–"8"
• M6 × 35 mm bolts: "17"–"24"
A
7
8
6
3
5
4
B
11
24
23
22
21
20 16 15
A. Right crankcase
B. Left crankcase
2. Remove:
• Left crankcase
ECA13900
CAUTION:
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.
1
2
13
12
17
18
9
14 19
10
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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.
ET1D71005

CHECKING THE BEARINGS AND OIL SEAL

1. Check:
• Bearings
Clean and lubricate the bearings, then rotate
the inner race with your finger.
Rough movement → Replace.
• Oil seals
Damage/wear → Replace.
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CHECKING THE OIL DELIVERY PIPE AND
OIL PIPE
1. Check:
• Oil delivery pipe
• Oil pipes
Damage → Replace.
Obstruction → Wash and blow out with com-
pressed air.
ET1D71038

CHECKING THE OIL STRAINERS

1. Check:
• Oil strainers
Damage → Replace.
Contaminants → Clean with solvent.
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CHECKING THE ENGINE OIL PUMP DRIVEN
GEAR
1. Check:
• Engine oil pump driven gear
Chips/pitting/roughness/wear → Replace.
5-97
CRANKCASE