Evinrude 4906B 4HP 1969 Owner's Manual page 73

3-32 POWERHEAD
When installing the piston into
it
powerhead, is possible
of
fingers each hand, and then
the cylinder with your thumbs.
Install the hose clamp over the piston
and bottom ring.
with one hand and at the same time rotate
the clamp back-and-forth
other hand. This "rocking"
clamp as it is tightened
the ring ends are
either side of the pin.
the clamp, and "rocking"
Both pistons installed
cylinder identification on
of the each piston is facing toward the exhaust port.
a small horsepower
to
compress the ring with the
to
push the piston into
Tighten the hose clamp
slightly with the
motion of the
will convince
properly positioned
Continue to tighten
the clamp until
in the powerhead. Notice the
each piston. The slanted side
Checking the flexibility
port.
the clamp is against
this point, the ring ends will be together
the cutout
the pin.
Tap the piston with the end of a wooden
tool handle until the ring enters
der. Remove the hose clamp.
you Install the remaining
on manner, one
ends of each ring straddle
piston groove.
Notice
from one groove to the next, by 180 •
After the last ring has been installed and
the clamp removed,
bore until the crown is about even with the
cylinder block surface.
Install
same manner.
Turn the cylinder block upside down with
the top of the block to your
the bolts and rod caps from each rod.
each rod cap in a definite
each will be installed
which it was removed.
Checking
exhaust port.
of
the rings through intake
the piston skirt.
on each ring end will be against
rings in the same
at-a-time, making
the pin in the
how the ring pins are s~aggered
tap the piston into the
the other pistons in exactly
LEFT.
position to ensure
onto the rod from
of
the flexibility the rings through
At
and
the cylin-
sure the
the
Remove
Set
the