Yamaha F400A 2022 - Checking the Connecting Rod Small End Inside Diameter and Big End Inside Diameter; Checking the Connecting Rod Big End Side Clearance; Checking the Crankshaft

7-82
Cylinder block
Checking the connecting rod small
end inside diameter and big end
inside diameter
1. Measure:
• Small end inside diameter “a”
• Big end inside diameter “b”
Out of specification → Replace the con-
necting rod assembly.
TIP:
• When checking the big end inside diameter,
reuse the removed connecting rod bolt.
• Tighten the connecting rod bolts “1” to the
specified torques in 3 stages.
• In the third tightening stage for the connect-
ing rod bolts “1”, mark the connecting rod
bolts and the connecting rod cap with iden-
tification marks “c”, and then tighten the
bolts 90° from the marks on the connecting
rod cap.
Checking the connecting rod big end
side clearance
1. Measure:
• Big end side clearance “a”
Out of specification → Check the crank-
shaft pin width.
See “Checking the crankshaft” (7-82).
Checking the crankshaft
1. Measure:
• Journal diameters “a”
• Crankshaft pin diameters “b”
• Crankshaft pin widths “c”
Out of specification → Replace the crank-
shaft.
Pin outside diameter
21.996–22.005 mm (0.8660–
0.8663 in)
Limit
21.986 mm (0.8656 in)
T
R
.
.
Connecting rod bolt “1”
1st: 13 N·m (1.3 kgf·m, 9.6 lb·ft)
2nd: 28 N·m (2.8 kgf·m, 21 lb·ft)
3rd: 90°
Small end inside diameter
22.008–22.025 mm (0.8665–
0.8671 in)
Big end inside diameter
65.990–66.010 mm (2.5980–
2.5988 in)
b
1
a
c
90°
Big end side clearance
0.140–0.310 mm (0.0055–
0.0122 in)
Limit
0.36 mm (0.0142 in)
a