SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 158 / 377

POWR
Power unit
5-45
6P23H11
Replacing the valve guide
1. Remove the valve guide
1
using the
special service tool from the combustion
chamber side.
2. Install the new valve guide
2
using the
special service tools from the camshaft
side until the valve guide installer
3
con-
tacts the cylinder head.
NOTE:
Apply engine oil to the surface of the new
valve guide.
3. Insert the special service tool into the
valve guide
2
, and then ream the valve
guide.
NOTE:
• Turn the valve guide reamer clockwise to
ream the valve guide.
• Do not turn the reamer counterclockwise
when removing the reamer.
4. Measure the valve guide inside diameter.
Checking the valve seat
1. Eliminate carbon or deposits from the
valves.
2. Apply a thin, even layer of Mechanic’s
blueing dye (Dykem) onto the valve seat.
3. Lap the valve slowly on the valve seat
with a valve lapper (commercially avail-
able) as shown.
Valve guide remover/installer:
90890-06801
Valve guide remover/installer:
90890-06801
Valve guide installer: 90890-06810
Valve guide position
a
:
13.8
±
0.2 mm (0.5
±
0.01 in)
S69J5790
1
S6P25E30
E
3
a
2
Valve guide reamer: 90890-06804
Valve guide inside diameter:
Intake and exhaust
5.504–5.522 mm
(0.2167–0.2174 in)