Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 74 / 422

Crankshaft with the upper, lower, and center main
bearings installed. Notice the hole in each bearing.
Matching pins in the cylinder block must index into
these holes during crankshaft installation.
CRANKSHAFT INSTALLATION
LARGE HORSEPOWER ENGINES
15 HP TO 40 HP
The following procedures outline steps to
install a crankshaft with needle upper, cen-
ter, and lower main bearings. The upper and
lower mains are complete bearings and can-
not be disassembled. The center bearing is
caged. Installation procedures for small
horsepower crankshafts with babbitt upper,
lower, and center main bearings and with
babbitt rod bearings are given in the follow-
ing sections.
Observe the pin installed in each main
bearing recess. Notice the hole in each
main bearing outer shell. During installa-
tion, the hole in each bearing shell MUST
index over the pin in the cylinder block.
Hold the crankshaft over the cylinder
block wi th the upper end to your LEFT.
Now, lower the crankshaft into the block,
and at the same time, align the hole in each
bearing to enable the pin in the block to
Bearing locating
pins in
the cylinder block. Each
pin
must index
into a
hole
in
the bearing shown
in
the
illustration at the top of this column.
CYLINDER BLOCK 3-33
Crankshaft installed into the cylinder block.
index with the hole. Rotate each bearing
slightly until all pins are properly indexed
with the matching bearing hole. Once all
pins are indexed, the crankshaft will be
properly seated.
Apply needle bearing grease to each
bearing cage. Coat the rod half of the
bearing area with needle bearing grease.
Needle bearing grease MUST be used be-
cause other types of grease will not thin out
and dissipate. The grease must disipate to
allow the gasoline and oil mixture to enter
and lubricate the bearing. If needle bearing
grease is not available, use a good grade of
petroleum jelly (Vasollne).
Insert the proper number of needle bear-
ings into each cage. Set the bearing cage
into the bottom half of the rod. With your
fingers on each side of the rod, pull up on
the rod and bring the rod up to the bottom
Cage
and
needle bearings installed into the lower
portion
of
the rod.