TIlE
ENGINE
A
Place the cylinder block face downwards on suitable
wooden supports on the
beef
ofthe
press, making sure that
there is sufficient space between the block and the bed
of
the press to allow the worn liner to pass down. Insert
the pilot complete with extension into the bottom
of
the
liner and carefully press the liner from the bore.
To
press
in
De,,'
liners
Thoroughly clean the inside
of
the bores and the outside
of
the liners. Stand the cylinder block upright on the bed
of
the press insert the pilot guide in the top
of
the liner,
and position the liner with its chamfered end in the top
of
the bore. Make certain that the liner
is
square with
the
top
of
the block and that the ram
of
the press is over
the centre
of
the pilot. Press the liner into the bore.
Finally, bore the cylinder liners
to
the dimensions
given in the table
at
the bottom
of
page A.30.
Section A.42
FI'ITING VALVE SEAT INSERTS
Should the valve seatings become so badly worn
or
pitted that the normal workshop cutting and
ref
acing
tools cannot restore them
to
their original standard
of
efficiency, special valve seat inserts can be fitted.
To
fit
the inserts machine the seating in the
cylindl!r head to the
dimensions given in Fig. A.34 and press
in
the inserts,
which have an interference fit
of
'0025
to
'0045 in. ('063
to ·114 mm.). Finally, grind
or
machine the seatings
to
the dimensions given in Fig. A.34. The throat
of
each
valve seat must blend into the throat in the cylinder
head. Normal valve grinding may be
;:!cessary
to
ensure
efficient seating,
and
before reassembly the valve ·stand·
down' should be checked as detailed in Section A.23.
A.31
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