Westerbeke 6.5KW - Page 44

3. Check the squareness of valve
spr ing. If it exceeds the
limit, replace with a new one.
Squareness limit:
than 3 mm (0.118
100 mm (3.937 in)
Checking Valve seat
Less
in) per
1. Check the protruding length of
the valve stem (dimension "L").
If it exceeds the specification,
correct it as follows.
Dimension "L" (standard):
39.5 mm (1.555 in)
When the dimension "L" becomes
0-0.5 mm larger than the stan-
dard, replace the valve.
When the dimension "L" becomes
0.5-1.5 mm larger than the stan-
dard, replace the valve and
adjust the dimension "L" to the
standard by adding some washers
between the lower spring seat
and cylinder head.
tOO/Oll9
When the dimension "L" becomes more than 1.5 mm larger than the
standard, replace both the valve and cylinder head.
2. Check for contact between the valve and valve seat as follows:
a. Apply a thin coat of Prussian Blue (or Redlead) on the valve
seat contact face.
b. Insert the valve into the valve guide and press fit the valve
on the valve seat.
c. Check if the valve seat contact face contacts the center
position of the valve contact face. If the contact position
is not centered, recut· and surface the valve seat and valve.
NOTE: Do not rotate the valve.
Refacing Valve and Valve Seat
Reface in the following order:
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