Checking The Cylinder Head; Checking The Valve Spring; Checking The Valve - SELVA MARINE Kingfish 25 Service Manual

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.
Cylinder head warpage limit:
0.10 mm (0.0039 in)

Checking the valve spring

1. Measure the valve spring free length a.
a
Valve spring free length a:
39.9 mm (1.57 in)
2. Measure the valve spring tilt b. Replace
if above specification.
b
Valve spring tilt limit b: 1.7 mm (0.07 in)

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.
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)
3. Measure the valve stem diameter b.
Replace if out of specification.
Camshaft and valve
a
7-40
7