Yamaha F50A - Checking the Cylinder Head

62Y3A11
5-46
1
2
3
4
5
6
7
8
I
3. Measure the camshaft journal diameter
c
and cylinder head journal inside diam-
eter
d
. Replace the camshaft and cylin-
der head if out of specification.
4. Calculate the camshaft oil clearance
e
as follows. Replace the camshaft and
cylinder head as a set if out of specifica-
tion.
Checking the cylinder head
1. Eliminate carbon deposits from the com-
bustion chambers and check for deterio-
ration.
2. Check the cylinder head warpage using a
straightedge
1
and thickness gauge
2
in five directions as shown. Replace if out
of specification.
Camshaft journal diameter
c
:
#1: 36.93–36.94 mm (1.4539–1.4543 in)
#2, #3, #4:
36.94–36.95 mm (1.4543–1.4547 in)
Cylinder head journal inside diameter
d
:
37.00–37.02 mm (1.4567–1.4575 in)
e
=
d
–
c
:
#1: 0.06–0.09 mm (0.0024–0.0035 in)
#2, #3, #4:
0.05–0.08 mm (0.0018–0.0031 in)
Cylinder head warpage limit:
0.1 mm (0.004 in)
Cylinder head