Evinrude 4906B 4HP 1969 Owner's Manual page 66

Therefore, the rod and piston
assembled correctly
sembly to be properly
cylinder. Soak the piston in a container
very hot water for
Heating the piston will cause it to expand
ever so slightly, but enough to allow the
wrist pin to be pressed
dif icul
f
ty,
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 bearing cape
with needle bearing grease, or a
of petroleum jelly.
with needles and insert it into the end ~of the
rod.
Slide the rod into the piston boss and
check a second time to be sure the slanted
side of the piston
exhaust side of the cylinder a'nd the hole in
the rod is facing upward.
Place the piston and rod in the arbor
press with the LOOSE or stamped "Lit side of
the piston facing UPWARD.
pin through the piston and rod.
press the wrist pin through until the groove
in the wrist pin for the lock ring is visible on
both ends of the pin. Remove the assembly
from the arbor press.
ring onto each end of the wrist pin.
models have a wire ring, and others have a
truarc ring. Use a pair of truarc
install the tr uar c ring.
Fill the piston skirt with a rag, towel,
shop cloths, or other suitable material.
of
The slanted side
exhaust port and the sharp
MUST be
in order for the as-
installed into the
about ten minutes.
through without
when they are
goal
grade
Load the bearing caze
is facing toward the
Press the wrist
Continue to
Install the retaining
Some
pliers to
The
MUsr
the piston face
edge
face the intake port.
of
WORD
IIlOOSE- '
Wrist pin
side.
rag will prevent
contact with the piston
laying on the bench.
strike the piston skirt, the skirt may become
distorted.
Assemble
wrist pins in the same manner.
with rags as protection
installed.
Alternate Assembling Method
If an arbor press is not available,
piston may be assembled to the rod in much
the same manner
sembling.
Heating the piston in hot
the
slightly as an assist
RODS AND PISTONS
entering the piston from
the rod from coming in
skirt
If the rod is allowed to
the other pistons,
Fill the skirt
until the assembly is
as described
water to expand the metal
to
installing the wrist pin.
3-25
the LOOSE"
1/
while it is
rods, and
the
for disas-