Yamaha Tenere 700 2020, Service Manual

Page: 256 / 472

CONNECTING RODS AND PISTONS
5-69
EAS30749
CHECKING THE PISTON PIN
The following procedure applies to all of the pis-
ton pins.
1. Check:
• Piston pin
Blue discoloration/grooves
→
Replace the
piston pin, and then check the lubrication sys-
tem.
2. Measure:
• Piston pin outside diameter “a”
Out of specification
→
Replace the piston pin.
3. Measure:
• Piston pin bore inside diameter “b”
Out of specification
→
Replace the piston.
4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification
→
Replace the piston pin
and piston as a set.
EAS30750
CHECKING THE CONNECTING RODS
1. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification
→
Replace the big end
bearings.
The following procedure applies to all of the
connecting rods.
NOTICE
ECA13930
Do not interchange the big end bearings and
connecting rods. To obtain the correct
crankshaft-pin-to-big-end-bearing clear-
ance and prevent engine damage, the big
end bearings must be installed in their origi-
nal positions.
a. Clean the big end bearings, crankshaft
pins, and the inside of the connecting rods
halves.
b. Install the big end upper bearing into the
connecting rod and the big end lower
bearing into the connecting rod cap.
a. Bottom of cylinder
b. Top of cylinder
Piston pin outside diameter
17.990–17.995 mm (0.7083–
0.7085 in)
Limit
17.970 mm (0.7075 in)
Piston pin bore inside diameter
18.004–18.015 mm (0.7088–
0.7093 in)
Limit
18.045 mm (0.7104 in)
a
b
G0 8 900 3
G0 8 9004
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore inside diameter “b” –
Piston pin outside diameter “a”
Piston-pin-to-piston-pin-bore
clearance
0.009–0.025 mm (0.0004–0.0010
in)
Oil clearance
0.027–0.051 mm (0.0011–0.0020
in)
b
G0 8 9005