Yamaha F40B - Assembling the Cylinder Head

67C3K11 5-36
1
2
3
4
5
6
7
8
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2. Measure the camshaft runout. Replace if
above specification.
3. Measure the camshaft journal diameters
c and d, and the cylinder head journal
inside diameters e. Replace the cam-
shaft, cylinder head, or both if out of
specification.
4. Check the automatic decompression
actuators. Replace the camshaft if dam-
aged or worn. (M and W model)
Assembling the cylinder head
1. Install a new valve seal 1 onto the valve
guide.
Cam lobe height a:
Intake and exhaust:
30.834–31.034 mm
(1.2139–1.2218 in)
Cam lobe width b:
Intake and exhaust:
25.900–26.100 mm
(1.0197–1.0276 in)
Camshaft runout limit:
0.03 mm (0.0012 in)
S67C5101
S67C5102
d
c
c
e
e
e
Camshaft journal diameter c:
36.935–36.955 mm
(1.4541–1.4549 in)
Camshaft journal diameter d:
36.925–36.945 mm
(1.4537–1.4545 in)
Cylinder head journal inside
diameter e:
37.000–37.025 mm
(1.4567–1.4577 in)
S67C5103
S67C5104
E
1
Cylinder head