Evinrude 4906B 4HP 1969 Owner's Manual page 260

8-1 DESCRIPTION
The lower unit is considered as that part
of the outboard below the exhaust housing.
The unit contains the propeller
driven and pinion gears, the driveshaft
the powerhead and the water
models equipped with shifting
the forward and reverse
with the dutch, shift assembly, and related
linkage, are all housed within the lower unit.
The lower unit is removed by one of four
methods depending on the model year and
the engine horsepower.
1- Removal of the power head is neces-
sary before the lower unit can be serviced.
2- The window on the exhaust
may be opened and the shift coupler discon-
nected.
3- The lower unit is lowered a couple
inches and the shift coupler removed.
Non-shift lower unit with the drive gear, cap, and
propeller shaft shown.
8
LOWER UNIT
shaft, the
from
pump. On
capabilities,
gears, together
housing
4- The lower unit does not have shifting
capabilities, therefore,
is not an invol ved procedure.
To determine the proper procedures
follow, simply check the Appendix for the
engine being serviced.
CHAPTER COVERAGE
Four different lower units are covered in
this chapter with separate sections for each.
The first type unit, presented
8-5, covers the 1.5 hp to
no shift capabilities.
The second type
Section 8-6, covers the 5.0 hp to the 25 hp
engines with mechanical shift.
The third unit, presented
covers the 28 hp to
mechanical shift.
similar to those covered
Mechanical shift lower
engine with the cap removed,
parts.
removal of the unit
in Section
4- hp engines with
unit, presented
in Section 8-7,
4-0 hp engines with
These units are very
in Section 8-6
unit for a 5 hp to 25
exposing the internal
to
in
hp