Westerbeke 65A-FOUR Service Manual page 48

SERVICING
Replacing Valve Guide
(When removing)
1. Using a valve guide replacing tool, press out the used valve
guide.
(When installing)
1. Clean a new valve guide, and apply engine oil to it.
2. Using a valve guide replacing tool, press in a new valve guide
until it is flush with the cylinder head as shown.
3. Ream precisely the I.D. of the valve guide to the specified
dimension .
• IMPORTANT
• Do not hit the valve guide with a hammer, etc. during
replacement.
(AI When ,emoving
Correcting Valve and Valve Seat
• NOTE
(8) When Inslalling
• Before correcting the valve and seat, check the valve
stem and the 1.0. of valve guide section, and repair them
if
necessary.
• After correcting the valve seat, be sure to check the valve
recessing.
1) Correcting Valve
1. Correct the valve with a valve refacer.
2) Correcting Valve Seat
1. Slightly correct the seat surface with a 1.047 rad (60 0) (intake
valve) or 0.785 rad (45 0) (exhaust valve) seat cutter (Code No.
07909-33102) .
2. Resurface the seat surface with a 0.523 rad (30 ') valve seat
cutter to intake valve seat and with a 0.262 rad (15 ') valve
seat cutter to exhaust valve seat so that the width is close to
specified valve seat width (2.12 mm, 0.0835 in.).
3. After resurfacing the seat, inspect for .even valve seating,
apply a thin film of compound between the valve face and
valve seat, and fit them with valve lapping tool.
4. Check the valve seating with prussian blue. The valve seating
surface should show good contact ali the way around.
(a) Identical Dimensions
(bl
Valve Seal Wldlh
(c) 0.523 rad (30 • ) or
0.262 rad (15 • )
(d) 0.262 rad (15 ' ) or
0.523 rad (30 • )
(e) 0.785 ,ad (45 • ) or
1.047 ,ad (60 • )
(A) Check Conlacl
(8) Correcl Seal Wldlh
(C) Check Conlacl
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VALVE
GUIDE
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(A) (8)
REMOVING INSTALLING
RESURFACING
Engines & Generators
42
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