Westerbeke 8.0KW-60Hz Service Manual page 25

ENGINE INSPECTION
c. After refacing the valve seat, put lapping c.ompound on
the valve face and lap the valve in the valve seat.
8. Valve lapping. Be sure to lap the valves in the seats after
refacing or replacing the valves or valve seats.
a. Put a small amount-of lapping compound on the valve
seat.
OF VALVE SEAT
• 0.071 IN (1.3 • 1.8MM)
.
-
NOTE: Do not put lapping compound on th~
valye stem.·
Use a lapping compound of 120 to 150 meshfor'initial
lapping and a compound of finer than 200 mesh for finish
lapping.
Mixing the compound with a sl'fIIlll amount of engine oil will
help put the compound on the valve face uniformly.
b. Using a lapping tool, hold the valve against the seat and
rotate it only a part of a turn, then ralse the valve off its
seat, rotating it
to
a new position. Press the valve
against the seal for another part of a turn. Repeat this
operation until the compound wears and loses
its
cutting property.
c. Wash the valve and valve seat with dry c1earting
solvent.
d. Apply engine oil to the valve and lap it in the seat.
e. Check the valve face for contact.
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COMI~USTIIONJET
9. Combustion jet replacement. Replace the combustion
jets only when they are cracked or defective.
a. To remove the jet, inseit a 6mm (O.2Sin) diameter
round bar through the bore in the cylinder head for the
glow plug and tap around the jet.
b. To install a new jet, put the jet in position in the head
with its tangential orifice in alignment with
the
center
of the main chamber and tap it with a plastic hammer.
COMBUSTION JET'
LAPPING
VALVE IN
SEAT
APPLYING LAPPING
COMPOUND
Engines -& Generators
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