Westerbeke 8.0KW-60Hz Service Manual page 23

ENGINE-DISASSEMBLY, INSPECTION AND ASSEMBLY
NUMBERS INDICATE THE
SUGGESTED ORDER
OF DISASSEMBLY
~~
4
RETAINING LOCK
1.
5
VALVE SPRING
.... RETAINER
3. Remove the valve retainers, valve springs and valves from
the cylinder head. When removing each valve retainer,
depress the retainer against the valve spring and remove
the retainer lock. Identify·each valve by putting a mark
indicating the number of the cylinder from which the
valve was removed.
'16
VALVE SPRING
I ~!~.~~UI'" HEAD
REMOVING VALVE
ASSEMBLY
8
VALVE SPRING
e,
SEAL
~OINTAKE
9
VALVE SPRING ,VALVE
SEAT
GUlDE~~~~t:
REMOVING THE CYUNOER HEAD
FROM THE CYUNOER BLOCK
3
CYLINDER HEAD
GASKET
1. Loosen each of the cylinder head bolts, a little at a time so
as to avoid the possibility of distorting the cylinder. repeat
several times until the bolts are unfastened.
2.
Remove the cylinder head and the cylinder head gasket.
SPECIAL TOOLS
4. Use pliers to remove the valve stem seals. Do not reuse
the stem seals.
CYLINDER HEAD INSPECTION
1. Before cleaning the cylinder head, check it for water
leaks, gas leaks, cracks, and other damage.
2. Remove all oil, water scale, sealant, and carbon. After
c1earting the oil passages, blow air through them to verify
that they are not blocked.
3. Check for distortion in the cylinder head gasket surface
using a straight edge and thickness gauge. If distortion
exceeds the specified limit, grind the gasket surface to
specification.
GASKET SURFACE DISTORTION
STANDARD VALVE 0.05mm (.00197In)
Dr les.
LIMIT 0.2mm (.00788In)
GRINDING LIMIT 0.2mm (00788In)
CYLINDER HEAD HEIGHT (SPECIFICATION WHEN NEW)
106.9 ·107.1mm (4.21 • 4.219In).
A
CAUTION:
No more then O.2mm (.00788In)
of
stock may
be
removed frilm the cylinder head and
cylinder block mating surfaces In total.
" ' - = : - - - - - - - '
...v: WESTERBEKE
Engines & Generators
16