Evinrude 4906B 4HP 1969 Owner's Manual page 67

3-26 POWERHEAD
First, soak the piston in a container
very hot water for about ten minutes.
Before pressing the wrist pin into place,
hold the piston and rod near the cylinder
block and check to be sure both will be
facing in the right direction
installed.
Pack the wrist pin needle
with needle bearing grease,
of petroleum jelly.
with needles and insert it into the end of the
rod.
Slide the rod into the piston
check a second time to be sure the slanted
side of the piston
exhaust side of the cylinder
the rod is facing upward.
Now, assume a sitting
couple towels over your lap.
tightly together to form a cradle
piston above your knees.
between your legs with the
the piston facing upward.
wrist pin through the piston using a drift pin
with a shoulder. The drift pin will fit into
the hole through
shoulder will ride on the end of the wrist
pin. Use sharp hard blows with a hammer.
will
Your legs absorb
damaging the piston.
on a regular basis during the busy season,
your legs will develop black-and-blue
but no problem, the marks will disappear
a few days.
Continue to drive the wrist pin through
the piston until the groove in the wrist pin
for the lockring is visible
Install the retaining
ring onto each end of the wrist pin.
Install ing the rod and wrist
piston.
when they are
bearing
or a good grade
Load the bearing
boss and
is facing toward
and the hole in
position and lay a
Hold your legs
for the
Set the piston
LOOSE side of
Now, drive the
the wrist pin and the
the shock without
If this method is used
areas,
at both ends.
spring wire or truarc
pin bearing into
of
cage
cage
the
HOLDING
BLOCK
Install the wrist pin using
F ill the piston skirt
shop cloths, or other suitable
rag will prevent
contact
laying on the bench.
strike the piston skirt, the skirt may become
distorted.
in
Assemble
wrist pins in the same manner.
with rags as protection
installed.
the Installing
piston can be held in your lap as described in the text.
DRIFT
PIN
a
holding block.
with a rag, towel,
the rod from
with the piston skirt
If the rod is allowed to
the other pistons,
until the assembly is
an
the wrist pin without
material. The
coming in
while it is
rods, and
Fill the skirt
arbor press. The