Evinrude 4906B 4HP 1969 Owner's Manual page 60

It may be necessary to heat the piston in
a container of boiling water
press the wrist pin free.
Remove the retaining
end of the wrist pin. Some clips are spring
wire type and may be worked free of the
piston using a screwdriver.
pistons have a truarc snap ring. This type of
ring can only be successfully
a pair of truarc pliers.
Place the piston in an arbor press using
the PROPER size cradle for the piston being
serviced, and with the
piston facing UPWARD.
The wrist pin must be driven out
the loose side. This may not seem reason-
able, but there is a very simple explanation.
By placing the piston in the arbor press
cradle with the tight
arbor ram pushing from the loose side, the
piston has good support and will not be dis-
torted. If the piston is placed in the arbor
press with the loose side down, the piston
would be distorted
ser vice.
Many rods have a wrist
Some are caged bearings and other are not.
Heating a piston in hot water
slightly.
in order to
clips from each
Other model
removed using
LOOSE of the
side
FROM
side down, and the
and unfit for further
pin bearing.
to expand the metal
RODS AND PISTONS
TRUARC
SNAP RING
Removing the wrist pin truarc
piston.
to
Snap ring used retain the wrist pin in the piston.
Removing a snap ring with
3-19
snap ring from the
a pointed tool.