Disassembling The Crankcase; Checking The Crankcase; Checking The Oil Pipe; Checking The Timing Chain - Yamaha YZFR6X(C) 2008 Service Manual

EAS25550

DISASSEMBLING THE CRANKCASE

1. Place the engine upside down.
2. Remove:
• Crankcase bolts
NOTE:
• Loosen each bolt 1/4 of a turn at a time. After
all of the bolts are fully loosened, remove
them.
• Loosen the bolts in decreasing numerical
order (refer to the numbers in the illustration).
• The numbers embossed on the crankcase
indicate the crankcase tightening sequence.
• M8 × 115 mm bolts: "8", "9"
• M8 × 85 mm bolts: "1"–"7", "10"
• M8 × 65 mm bolts: "11", "12"
• M6 × 80 mm bolt: "28"
• M6 × 65 mm shoulder bolts: "13", "14"
• M6 × 65 mm bolts: "16", "20", "21"
• M6 × 55 mm bolts: "15", "22"–"27"
• M6 × 45 mm bolts: "17"–"19"
• M6 × 30 mm bolt: "29"
24 23 22
13
25
26
7 5
4
27 10
28
16
29 17 18
3. Remove:
• Lower crankcase
ECA13900
CAUTION:
Tap on one side of the crankcase with a
soft-face hammer. Tap only on reinforced
portions of the crankcase, not on the
crankcase mating surfaces. Work slowly
and carefully and make sure the crankcase
halves separate evenly.
EAS25580

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
21
9
1 3
6 8
2
20
15 14
12
11
19
Obstruction → Blow out with compressed
air.
EAS25600

CHECKING THE OIL PIPE

1. Check:
• Oil pipe
Damage → Replace.
Obstruction → Wash and blow out with
compressed air.
EAS25620

CHECKING THE TIMING CHAIN

Refer to "CAMSHAFTS" on page 5-7.
EAS25640

ASSEMBLING THE CRANKCASE

1. Lubricate:
• Crankshaft journal bearings
(with the recommended lubricant)
Recommended lubricant
Engine oil
2. Apply:
• Sealant
(onto the crankcase mating surfaces)
Yamaha bond No. 1215
90890-85505
(Three Bond No.1215®)
NOTE:
Do not allow any sealant to come into contact
with the oil gallery or crankshaft journal bear-
ings. Do not apply sealant to within 2–3 mm
(0.08–0.12 in) of the crankshaft journal bear-
ings.
1. Three Bond No.1215
3. Install:
• Dowel pins
4. Set the shift drum assembly and transmis-
sion gears in the neutral position.
5-55
CRANKCASE
1
®