SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 156 / 377

POWR
Power unit
5-43
6P23H11
Removing the cylinder head
1. Remove the cylinder head bolts in the
sequence shown.
CAUTION:
Do not scratch or damage the mating sur-
faces of the cylinder head and cylinder
block.
2. Remove the intake and exhaust valves.
NOTE:
Be sure to keep the valves, springs, and
other parts in the order as they were
removed.
Checking the valve spring
1. Measure the valve spring free length
a
.
Replace if below specification.
2. Measure the valve spring tilt
b
. Replace
if above specification.
Checking the valve
1. Check the valve face. Replace if pitted or
worn.
2. Measure the valve margin thickness
a
.
Replace if out of specification.
S6P25810E
PORT UP STBD
(T55)
Valve spring compressor
1
:
90890-04019
Valve spring compressor
attachment
2
:
90890-06320
Valve spring free length
a
:
44.2 mm (1.74 in)
Valve spring tilt limit
b
:
1.2 mm (0.05 in)