"CRUSADER
250," "250
CLIPPER"
AND
"CRUSADER
SPORTS"
gudgeon pin in place, push out the pin and lift the piston
from the connecting rod. Note that the piston has a
split
skirt and that the split should face forwards. The
piston
is
marked with the word
"
Front
"
by
the leading
valve
depression in the piston crown.
24
Removal of Valves. Lift or prise off the hardened
caps from the ends of the valve stems, then, compress
the
valve
springs with a suitable compressor. Lift out
the
split, conical collars and remove the compressor
when the springs and valves may be withdrawn. Keep
the end caps, split collars, springs and other parts paired
off
with their respective valves and replace them in the
same positions when reassembling.
On
the
"Crusader Sports"
there
is
some slight
difference in valve spring anchorage. There are no end
caps on the valve stems and the alloy top spring collars
are retained by split conical cotters which have a narrow
interna! projection which
fits
into a corresponding
groove in the valve stem.
25
Removal of Carbon. Remove carbon from the
valves, ports and combustion chamber by scraping or
( only if the cylinder head
is
cast iron)
by
immersion in
a solution
of
4 ozs.
of
commercial potash to a gallon
of
water. Carefully remove the piston rings. Remove
carbon from the ring grooves and the top
of
the piston
by
carefully scraping, taking care not to dig into the
aluminium.
On
no
account
allow
potash solution to
corne
into contact with the aluminium piston.
26
Grinding-in Valves.
Sinear
the valve seats with a
little grinding compound, replace the valve in position
and rotate
it
with a semi-rotary motion by using a tool
with a suction cap frequently lifting it off its seat and
gradually working the
valve
round so that each point on
the valve face cornes into contact with each part of the
seat. Continue grinding until a bright ring
is
obtained
on both the valve and its seating.
If
the
valve
or seats are very
badly
pitted and
will
not form good faces with a reasonable amount of
grinding, the parts should be returned to the Works for
18
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