Replacing The Valve Guide; Checking The Valve Seat - SELVA MARINE Wahoo 15 Service Manual

Valve-stem-to-valve-guide clearance
= valve guide inside diameter – valve
stem diameter:
Intake:
0.010–0.037 mm
(0.0004–0.0015 in)
Exhaust:
0.025–0.052 mm
(0.0010–0.0020 in)

Replacing the valve guide

1. Remove the valve seal.
2. Remove the valve guide 1 by striking
the special service tool from the combus-
tion chamber side.
1
Valve guide remover/installer:
90890-06801
3. Install a new valve guide 2 using the
special service tool 3 from the camshaft
side to the specified height a.
2
E
NOTE:
Apply engine oil to the surface of the new
valve guide before installation.
6AG3J11
5
S6AG5181
3
a
S6AG5180
Valve guide remover/installer 3:
90890-06801
Valve guide height a:
Intake and exhaust:
10.8 ± 0.2 mm (0.4 ± 0.01 in)
4. Insert the special service tool into the
valve guide 2, and then ream the valve
guide.
4
2
NOTE:
• Apply engine oil to the inner surface of the
valve guide before reaming it.
• Turn the valve guide reamer clockwise to
ream the valve guide.
• Do not turn the reamer counterclockwise
when removing it.
• Be sure to clean the valve guide after ream-
ing it.
Valve guide reamer 4: 90890-06804
5. Measure the valve guide inside diameter.
Valve guide inside diameter:
Intake and exhaust:
5.500–5.512 mm
(0.2165–0.2170 in)

Checking the valve seat

1. Eliminate carbon deposits from the valve.
2. Apply a thin, even layer of Mechanic's
blueing dye (Dykem) onto the valve seat.
Cylinder head
1
2
3
4
E
S6AG5190
5
6
7
8
9
5
5-40