Replacing The Valve Guide; Checking The Valve Seat - SELVA MARINE Blue Whale 250 EFI Service Manual

POWR

Replacing the valve guide

1. Remove the valve guide 1 using the
special service tool from the combustion
chamber side.
Valve guide remover/installer:
90890-06801
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.
3
a
NOTE:
Apply engine oil to the surface of the new
valve guide.
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)
3. Insert the special service tool into the
valve guide 2, and then ream the valve
guide.
5-45
Power unit
1
S69J5790
2
E
S6P25E30
NOTE:
• Turn the valve guide reamer clockwise to
ream the valve guide.
• Do not turn the reamer counterclockwise
when removing the reamer.
Valve guide reamer: 90890-06804
4. Measure the valve guide inside diameter.
Valve guide inside diameter:
Intake and exhaust
5.504–5.522 mm
(0.2167–0.2174 in)

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.
6P23H11