Could someone explain the proper method for checking--and filling-- the
lower unit gearcase oil for an outboard motor.

Thank--Mike

Michael wrote:
Could someone explain the proper method for checking--and filling-- the
lower unit gearcase oil for an outboard motor.

Thank--Mike


Check first that the oil in the gear housing is O.K., simply crack the
lower screw and let a little out. It should be light to medium brown in
color, and at least translucent.. Lighter, opaque and creamy colored
indicates water intrusion. Inky black & burnt odor - - it's past due for
a change. 100 % water, Bubbly grey-black gleep, under pressure, metallic
colors, bad odors indicate serious problems. At any rate, change the
oil every 50 running hours using a high quality lube such as OMC's Ultra
HPF or Quicksilver synthetic.

Changing the Lower Gear-Case Oil:

1. There are two screws located on the lower gear case, and they are
to help you drain and fill in with new gear lube. The top screw is the
level and the bottom screw is the drain.


2. With a large straight-slotted screwdriver, back out the top
"level" screw just enough to break the vacuum -- not all the way out --
to allow drainage.


3. Next, make sure an oil pan is under the lower "drain" screw, and
then loosen the screw. Remove the screw and the oil/lube will drain.


4. Now it's time to take a look at the gasket. If the o-ring/gasket
looks worn or tattered, replace it with a new one.


5. Back out the top (level) screw completely loosen up the vacuum so
the gear case can properly empty.


6. Insert a pump kit into the bottom (drain) screw hole and the pump
portion into the 90-weight bottle of oil. Pump the bottle until the
fluid starts flowing out of the top (level) screw hole, and once it
starts coming out give the bottle a couple of extra pumps.


7. Put in the top (level) screw and clean the excess fluid off the
gear case.


8. Put in the bottom screw and you're done!

"From the WWW"

Rob

The outboard should be in the down or normal operating position for this
btw.

"trainfan1" wrote in message
...
Michael wrote:
Could someone explain the proper method for checking--and filling-- the
lower unit gearcase oil for an outboard motor.

Thank--Mike


Check first that the oil in the gear housing is O.K., simply crack the
lower screw and let a little out. It should be light to medium brown in
color, and at least translucent.. Lighter, opaque and creamy colored
indicates water intrusion. Inky black & burnt odor - - it's past due for a
change. 100 % water, Bubbly grey-black gleep, under pressure, metallic
colors, bad odors indicate serious problems. At any rate, change the oil
every 50 running hours using a high quality lube such as OMC's Ultra HPF
or Quicksilver synthetic.

Changing the Lower Gear-Case Oil:

1. There are two screws located on the lower gear case, and they are to
help you drain and fill in with new gear lube. The top screw is the level
and the bottom screw is the drain.


2. With a large straight-slotted screwdriver, back out the top "level"
screw just enough to break the vacuum -- not all the way out --
to allow drainage.


3. Next, make sure an oil pan is under the lower "drain" screw, and
then loosen the screw. Remove the screw and the oil/lube will drain.


4. Now it's time to take a look at the gasket. If the o-ring/gasket
looks worn or tattered, replace it with a new one.


5. Back out the top (level) screw completely loosen up the vacuum so
the gear case can properly empty.


6. Insert a pump kit into the bottom (drain) screw hole and the pump
portion into the 90-weight bottle of oil. Pump the bottle until the fluid
starts flowing out of the top (level) screw hole, and once it starts
coming out give the bottle a couple of extra pumps.


7. Put in the top (level) screw and clean the excess fluid off the gear
case.


8. Put in the bottom screw and you're done!

"From the WWW"

Rob

The outboard should be in the down or normal operating position for this
btw.

When outboard engine will be in the vertical position for lower unit drive
lubrication, we will fill gearcase completely with oil, making very
efficient hydraulic engine brake.
My "Clymer Mercury Service/Repair Handbook" states on page 22:
"The gear housing cannot be completely filled otherwise"!
Following illustration #16 shows outboard in maximum tilted position during
filling procedure.
Regards!
Tadeusz

Tadeusz Jerzy Korsak wrote:
The outboard should be in the down or normal operating position for this
btw.

When outboard engine will be in the vertical position for lower unit drive
lubrication, we will fill gearcase completely with oil, making very
efficient hydraulic engine brake.
My "Clymer Mercury Service/Repair Handbook" states on page 22:
"The gear housing cannot be completely filled otherwise"!
Following illustration #16 shows outboard in maximum tilted position during
filling procedure.
Regards!
Tadeusz



Don't believe everything you read in a Clymer manual.

Rob