Cylinder Head
Inspection
1.
Thoroughly clean the surface of the cylinder
head and check for damage and/or pitting of the
combustion chambers.
2.
Using a straight edge
and
feeler gauges, check
the cylinder head gasket face for warp, which
could lead to gasket failure. Replace the cylinder
head
if warped beyond the flatness limit.
Checking head flatness
Cylinder head flatness 0.030
mm
tolerance
3.
Check the cam chain rubbing blades. Renew if
worn or damaged.
Ensure all traces of fluid (coolant,
oil
etc.) are
removed from the threaded holes
in
the crankcase.
Should any fluid remain
in
any of the threaded
holes, severe crankcase damage could result from
hydraulic locking of head bolts
on
assembly
of
the
engine.
Installation
1.
Thoroughly clean the upper faces of the
crankcase
and
liners. Also clean the liner to
crankcase mating faces.
2.
Fit the cylinder liners (see page 5.19).
3.
Move
the
cam
chain rubbing blades
to
a position
that allows the head to fit over them.
4.
Ensure that both head dowels remain
in
position
in
the crankcase.
1
.",,"
1.
Dowels
5.
Position a new cylinder head gasket to the
crankcase.
6.
Lower the cylinder head over the cam chain
rubbing blades
and
locate it onto the dowels.
Cylinder head bolts must never
be
reused and must
always
be
replaced if removed or loosened.
Use
the
correct procedure to tighten the cylinder
head bolts carefully following the three-stage
procedure
below.
This will ensure the long-term
reliability of the cylinder head gasket.
Failure to follow the correct tightening procedure or
reuse of old
head
bolts may lead to engine damage
and premature failure of the cylinder head gasket.
3.16
Service Manual - Rocket
III
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