Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 76 / 422

INCORRECT CORRECT
line without any feeling of catching. Any
step on the outside will mean a step on the
inside of the rod and cap. Just a whisker of
a lip, will cause one of the needle bearings
to catch and fail to rotate. The needle will
quickly flatten, and the rod will begin to
"knock". Needle bearings MUST rotate or
the function of the bearing is lost.
Tighten the rod cap bolts alternately and
evenly in three rounds to the torque value
given in the Torque Table in the Appendix.
Tighten the bolts to 1/2 the torque value on
the first round, to
3/4-
the torque value on
the second round, and to the full torque
value on the third and final round. On each
round, check with the pick to be sure the
cap remains seated squarely.
Install the other rod cap/s in the same
manner.
After the rods have been connected to
the crankshaft, rotate the crankshaft until
the rings on one cylinder are visible through
the exhaust port. Use a screwdriver and
Checking the flexibility
of
the rings through the
exhaust port.
CYLINDER BLOCK 3-35
push on each ring to be sure it has spring
tension. It will be necessary to move the
piston slightly, because all of the rings will
not be visible at one time. If there is no
spring tension, the ring was broken during
installation. The piston must be removed
and a new ring installed. Repeat the tension
test at the intake port. Check the other
cylinder/s in the same manner.
CRANKSHAFT INSTALLATION
SMALL HORSEPOWER ENGINES
1.5 HP W/TOP NEEDLE MAIN BRG.
AND BABBITT CTR. AND BOTTOM
9.5 HP W/TOP AND BOTTOM NEEDLE
BRG. AND CTR. BABBITT BRG.
5.0 HP, 5.5 HP, AND 6.0 HP W/ALL
BABBITT MAIN BEARINGS
This section provides detailed instruc-
tions to install a small horsepower crank-
shaft with any of the bearing combinations
listed in the heading. Some of the engines
covered in these paragraphs have rod liners,
others do not as follows:
With rod bearing liner -- 1.5 hp, 5.0 hp,
5.5 hp, 6 hp, and 9.5 hp from 1956 thru 1960.
With no rod bearing liner -- 5.5 hp and 10
hp 1961 thru 1964-.
The procedures pickup the work after
the piston/s have been installed, as describ-
ed earlier in this section.
Lower the crankshaft into place in the
cylinder block with the long threaded shank
end at the top of the cylinder block. (It is a
known fact, in more than just a few shops
around the country, because of haste, the
crankshaft installation work has proceeded
with the short end at the top.)
Rod and cap with the alignment marks visible.