Bottom Seal - Evinrude 4906B 4HP 1969 Owner's Manual

seal with OMC Seal Compound.
special tool to tap the seal
place around the crankshaft.
If the power head has been disassembled,
a socket or other similar type tool of equal
diameter as the seal may be used to tap it
into the bearing.
serviced does not have the seal in the bear-
ing, lay the seal in the recess of the block.
When the crankcase
seal will be in place.

3-9 BOTTOM SEAL

The bottom seal has equal importance
the top seal. This seal
maintain vacuum and pressure
half of the crankcase
The bottom seal will vary, depending on
the model engine being serviced.
lowing procedures and accompanying
trations cover the most common Johnson/-
Evinrude bottom seal installed.
Seal Mounted on the Driveshaft
When the power head is removed, observe
around the driveshaft
the seal will be visible.
a gasket, plate, an O-ring,
bearing, spring, washer, and a pin. The pin
Using the proper tools
Use the
EVENLY
If the powerhead being
cover is installed,
is installed
in the lower
for the lower cylinder.
The fol-
at the lower end, and
The seal consists of
lower seal
to
install the top seal.
is installed
into the seal upward and in place.
As the powerhead
the driveshaft
held in place and will hold the vacuum and
pressure created
ing.
Removal
With the powerhead
the
simple matter
housing and remove
place the gasket
spring, to be sure it is not distorted,
as washer for damage.
to
Seal Mounted on the Crankshaft
This bottom seal prevents exhaust fumes
from entering the crankcase,
sure and vacuum inside.
llus-
i a quadrant
spring, another washer, and a snap ring.
Removal
To remove this seal from the lower end
of the crankshaft,
pliers and CAREFULLY
ring. TAKE CARE not to lose any of the
parts due to the spring pressure against the
snap ring.
fits inside the seal.
able. Observe
edge on one side.
face upward when the seal is installed.
Powerhead lower seal installed
BOTTOM SEAL
through the dr iveshaft and holds
is lowered down over
during installation,
when the engine is operat-
assembled,
to reach into the
the seal and then re-
and O-ring.
and holds pres-
The seal consists of
ring, O-ring, retainer
use a pair of Tru-arc
remove
Notice how the quadrant
This ring is also remov-
how the seal has a raised
This raised edge
on the driveshaft.
3-13
the seal is
it is a
exhaust
Check the
and the
washer,
the snap
O-ring
MUST