SELVA MARINE Kingfish 25, Service Manual

Page: 188 / 398

7-40
7
TIP:
Make sure to keep the parts in the order as
they were removed.
Checking the cylinder head
1. Remove carbon deposits from the com-
bustion chambers and check the cylinder
head for corrosion or scratches.
2. Check the cylinder head warpage in 7
directions. Replace the cylinder head
assembly if above specification.
Checking the valve spring
1. Measure the valve spring free length
a
.
2. Measure the valve spring tilt
b
. Replace
if above specification.
Checking the valve
1. Check the valve face. Replace the valve
if pitted or worn.
2. Measure the valve margin thickness
a
.
Replace if out of specification.
3. Measure the valve stem diameter
b
.
Replace if out of specification.
Cylinder head warpage limit:
0.10 mm (0.0039 in)
a
Valve spring free length
a
:
39.9 mm (1.57 in)
Valve spring tilt limit
b
: 1.7 mm (0.07 in)
Valve margin thickness
a
:
Intake:
0.800–1.200 mm (0.0315–0.0472 in)
Exhaust:
1.000–1.400 mm (0.0394–0.0551 in)
b
a
Camshaft and valve