engine YAMAHA VX110 2005 Workshop Manual

5-70
EPOWRVALVES AND VALVE SPRINGS
2. Compress the valve spring, and then
install the valve cotter 1
using a thin
screwdriver with a small amount of grease
applied to it.
Valve spring compressor:
YM-01253/90890-04019
Valve spring compressor
attachment:
(for the intake valve):
YM-04114/90890-04114
(for the exhaust valve):
YM-04108/90890-04108
3. Lightly tap the valve spring retainer with a
plastic hammer to set the valve cotter
securely.
NOTE:
Apply engine oil to the valve pads and valve
lifters before installation.
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5-71
EPOWRCRANKCASE
CRANKCASE
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
OIL PAN AND CRANKCASE
REMOVALFollow the left “Step” for removal.
Engine unit Refer to “ENGINE UNIT”.
Intake assembly Refer to “FUEL INJECTION SYSTEM” in
Chapter 4.
Exhaust pipes 1 and 2 Refer to “EXHAUST PIPES 1 AND 2”.
Exhaust manifold Refer to “EXHAUST MANIFOLD”.
Generator cover Refer to “GENERATOR AND STARTER
MOTOR”.
Oil tank Refer to “OIL TANK”.
Oil pump Refer to “OIL PUMP”.
*: Loosen completely
6
21 20
20 11
10 9
87
23
4
5
16
151718
13 14
1219
1
LT
271
LT
LT
572
LT
LT
572
LT
LT
572
LT
LT
572
LT
LT
572
LT
E
E
AA
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 70 mm
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 20 mm
20 N •
m (2.0 kgf • m, 14 ft • Ib)
8 × 40 mm
2nd *
3rd 15 N • m (1.5 kgf
• m, 11 ft
• Ib) 1st 7.8 N • m (0.78 kgf
• m, 5.6 ft
• Ib)
9 × 105 mm
4th 49 ± 5˚
8.4 N •
m (0.84 kgf • m, 6.1 ft • Ib)
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 55 mm
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 55 mm
7.6 N •
m (0.76 kgf • m, 5.5 ft • Ib)
6 × 16 mm
15 N •
m (1.5 kgf • m, 11 ft • Ib)
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 20 mm
18
AA
1280B
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5-72
EPOWRCRANKCASE
EXPLODED DIAGRAM
Step Procedure/Part name Q’ty Service points
Reduction drive gear case Refer to “REDUCTION DRIVE GEAR”.
Cylinder head Refer to “CAMSHAFTS”.
1 Timing chain 1
2 Engine temperature sensor 1
3 Washer 1
4Bolt 2
5 Thermoswitch (engine) 1
6 Oil pressure switch 1
7Bolt 1
8Bolt 1
9 Anode cover 1
10 Grommet 1
6
21 20
20 11
10 9
87
23
4
5
16
151718
13 14
1219
1
LT
271
LT
LT
572
LT
LT
572
LT
LT
572
LT
LT
572
LT
LT
572
LT
E
E
AA
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 70 mm
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 20 mm
20 N •
m (2.0 kgf • m, 14 ft • Ib)
8 × 40 mm
2nd *
3rd 15 N • m (1.5 kgf
• m, 11 ft
• Ib) 1st 7.8 N • m (0.78 kgf
• m, 5.6 ft
• Ib)
9 × 105 mm
4th 49 ± 5˚
8.4 N •
m (0.84 kgf • m, 6.1 ft • Ib)
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 55 mm
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 55 mm
7.6 N •
m (0.76 kgf • m, 5.5 ft • Ib)
6 × 16 mm
15 N •
m (1.5 kgf • m, 11 ft • Ib)
12 N •
m (1.2 kgf • m, 8.7 ft • Ib)
6 × 20 mm
18
AA
1280B
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5-77
EPOWRCRANKCASE
Crankcase assembly
1. Lubricate:
Crankshaft journal bearings
(with the recommended lubricant)
2. Apply:
ThreeBond 1280B
(onto the crankcase mating surfaces)
NOTE:
Do not allow any sealant to come into contact
with the oil gallery or crankshaft journal bear-
ings.
Recommended lubricant:
Engine oil
3. Install:
Dowel pins 1

O-ring 2

11
2
1
1280B
4. Install:
Crankcase bolts
NOTE:
Lubricate the bolt 1
–0 threads and wash-
ers with engine oil.
Finger tighten the crankcase bolts.
M9
× 105 mm bolts:
1–
0
M6
× 55 mm bolts:
A–
H,
J
M6
× 70 mm bolts:
I
15397
ICAEG
86240
HFBDJ
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5-87
EPOWRCONNECTING RODS AND PISTONS
Connecting rod inspection
1. Measure:
Big end oil clearance
Out of specification →
Replace the big
end bearings.
Big end oil clearance:
0.016–0.040 mm
(0.0006–0.0016 in)
Measurement steps:
The following procedure applies to all of the
connecting rods.
CAUTION:
Do not interchange the big end bearings
and connecting rods. To obtain the cor-
rect big end oil clearance and prevent
engine damage, the big end bearings
must be installed in their original posi-
tions.
Clean the big end bearings, crankshaft
pins, and the inside of the connecting rod
halves.
Install the big end upper bearing into the
connecting rod and the big end lower
bearing into the connecting rod cap.
NOTE:
Align the projections a
on the big end bear-
ings with the notches b
in the connecting
rod and connecting rod cap.
Put a piece of Plastigauge 1
on the
crankshaft pin.
Assemble the connecting rod halves.
1
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5-89
EPOWRCONNECTING RODS AND PISTONS
For example, if the connecting rod “P1” and the
crankshaft web “P
1” numbers are “5” and “1”
respectively, then the bearing size for “P
1” is:
Bearing size of P
1:
“P
1” (connecting rod) –
“P
1” (crankshaft web)
5 – 1 = 4 (green)
BEARING COLOR CODE
1brown
2 black
3blue
4 green5 G
P4P3P2P1
Connecting rod and piston installation
The following procedure applies to all of the
pistons and connecting rods.
1. Install:
Oil ring
2nd ring
Top ring
NOTE:
Be sure to install the piston rings so that the
manufacturer’s marks or numbers face up.
2. Install:
Piston 1

Connecting rod 2

Piston pin 3

Piston pin clips 4

NOTE:
Apply engine oil onto the piston pin.
When installing the connecting rod to the pis-
ton, make sure that the “Y” mark a
on the
connecting rod faces towards the left when
the exhaust valve recesses b
on the piston
face upward. Refer to the illustration.
Reinstall each piston into its original cylinder
(numbering order starting from the front: #1
to #4).
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5-90
EPOWRCONNECTING RODS AND PISTONS
3. Offset:
Piston ring end gaps
aTop ring, oil ring expander spacer
b2nd ring, lower oil ring rail
cUpper oil ring rail
ÈExhaust sidebc
a È
90˚
45˚
90˚
4. Lubricate:
Piston
Piston rings
Cylinder
(with the recommended lubricant)
Recommended lubricant:
Engine oil
5. Lubricate:
Bolt threads
Nut seats
(with the recommended lubricant)
Recommended lubricant:
Molybdenum disulfide grease
6. Lubricate:
Crankshaft pins
Big end bearings
(with the recommended lubricant)
Recommended lubricant:
Engine oil
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5-95
EPOWRCRANKSHAFT
CAUTION:
Do not interchange the crankshaft journal
bearings. To obtain the correct crankshaft
journal oil clearance and prevent engine
damage, the crankshaft journal bearings
must be installed in their original positions.
Measurement steps:
Clean the crankshaft journal bearings,
crankshaft journals, and bearing portions
of the crankcase.
Place the upper crankcase upside down
on a bench.
Install the crankshaft journal upper bear-
ings 1
and the crankshaft into the upper
crankcase.
NOTE:
Align the projections a
of the crankshaft
journal upper bearings with the notches b
in the upper crankcase.
Put a piece of Plastigauge 2
on each
crankshaft journal.
NOTE:
Do not put the Plastigauge over the oil hole
in the crankshaft journal.
Install the crankshaft journal lower bear-
ings into the lower crankcase and assem-
ble the crankcase halves.
NOTE:
Align the projections a
of the crankshaft
journal lower bearings with the notches b
in the lower crankcase.
Do not move the crankshaft until the
clearance measurement has been com-
pleted.
1
a
b
2
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5-97
EPOWRCRANKSHAFT
Crankshaft installation
1. Install:
Crankshaft journal upper bearings
(into the upper crankcase)
Crankshaft journal lower bearings
(into the lower crankcase)
NOTE:
Align the projections a
on the crankshaft
journal upper bearings with the notches b
in
the upper crankcase.
Be sure to install each crankshaft journal
bearing in its original place.
a
b
2. Lubricate:
Crankshaft journals
Crankshaft journal bearings
(with the recommended lubricant)
Recommended lubricant:
Engine oil
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6-18
E
JET
PUMPBEARING HOUSING
BEARING HOUSING
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
BEARING HOUSING REMOVAL
Follow the left “Step” for removal.
Engine unit Refer to “ENGINE UNIT” in Chapter 5.
1 Rubber coupling 1
2Bolt 4
3 Intermediate housing cover 1
4Clamp 2
5 Intermediate drive shaft assembly 1
6 Rubber hose 1
Reverse the removal steps for installation.
2
346
5
1
LT
271
8 × 48 mm
17 N • m (1.7 kgf • m, 12 ft • Ib)
4.2 N • m (0.42 kgf • m, 3.0 ft • Ib)
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