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TOHATSU
outboards - Lower Unit Oil Change
This step-by-step guide is
designed to aid you in changing your Tohatsu
outboard motor's lower unit oil. This 8-step
process is all it takes to ensure the oil
in your lower unit is properly maintained.
The only tools required are a flat-head screwdriver
and an oil drain pan. The entire process takes
approximately 10-20 minutes. We recommend
you change your lower unit oil at least once
a year depending on how heavily the usage
of your outboard. Any brand of oil that meets
the specification of API GL5 SAE 80 or 90
weight is suitable for use in your Tohatsu
outboard. You should be able to find lower
unit (gear case) oil at your local marine
dealer or automotive store.
The chart at the bottom of this page lists
the approximate amount of oil needed to fill
the lower unit of each model currently offered
by Tohatsu.
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Step one
First, be sure your
outboard is in a vertical and upright position. Locate and
identify the upper and lower Fill & Drain Plugs. Place an
oil drain pan beneath the outboard. |
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Step two
Remove the
BOTTOM drain plug first (not the top). Some oil will begin to
trickle out so be sure your oil drain pan is positioned correctly to
catch the draining oil. |
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Step three
Next, remove the
TOP drain plug. This will release the vacuum that exists and
allow the oil to drain freely from the lower
unit. |
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Step four
Let all of the oil
drain completely from the lower unit (this will take about
5-10 minutes). |
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Step five
Once all the oil has
completely drained out it is time to refill the lower unit. There
are several types of apparatuses available ranging from squeeze bottles to
tubes. One of the more popular "do-it-yourself" methods is to use a
squeeze bottle.
You can use any brand of lubricant that has a grade
designation of API GL5 SAE 80 or 90 weight. Make sure you do not
mix different oil brands or weights.
To refill the lower
unit, insert the bottle/tube into the BOTTOM drain hole. Then
slowly squeeze the bottle to force the oil into the lower
unit.
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Step six
Continue adding oil until
the lubricant is flowing freely from the top hole and is free from
air bubbles. |
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Step seven
Keep the bottle/tube in the
bottom plug (or plug the hole with your finger) and re-install the TOP
plug. This will create a slight vacuum that will minimize the oil
loss while you reinstall the bottom plug. |
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Step eight
Now, QUICKLY remove
the bottle (or your finger) from the bottom hole and install the drain
plug. It is important to do this as quickly as possible to
minimize the amount of oil loss. Even though there is a slight vacuum,
there will still be some loss of oil. Do not be concerned about losing
some oil, however, if you lose an excessive amount of oil you will need to
go back and add additional oil. Hand tighten both the lower and upper
drain plugs and wipe off any oil on your lower
unit. |
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WARNING: Running your
outboard without completely filling the lower unit with oil to the proper
level will cause severe damage to your outboard. See the comments at the
end of this guide on how to check for the proper oil level in your
lower unit.
Be sure and properly dispose of your old oil by
taking it to an oil recycling center. Most "quick lube" oil change centers
or auto service stations will accept your used oil for a nominal
fee.
Comments: To check your oil level, remove the top oil
plug, insert a small piece of wire straight into the top hole
approximately 1 inch and withdraw the wire. If oil is on the wire the oil
level is correct, if not the unit must be refilled to the correct
level.
To add ("top-off") oil install the top plug again,
remove the bottom plug and put your oil bottle into the hole. Remove the
top plug to release the vacuum and add the necessary amount of oil.
Reinstall the top plug, then quickly reinstall the bottom plug. Check the
oil level once again as described above.
Lower Unit Oil Needed by
Model
| Model
| Approximate Fluid Ounces Required |
2.5A
& 3.5A
| 3.0
fl oz |
3.5B
| 6.0
fl oz |
4
(4-stroke)
| 6.6
fl oz |
5
(2-stroke)
| 6.6
fl oz |
5
(4-stroke)
| 6.6
fl oz |
6
(4-stroke)
| 6.6
fl oz |
8
(2-stroke)
| 10.8
fl oz |
8
(4-stroke)
| 10.8
fl oz |
9.8
(2-stroke)
| 10.8
fl oz |
9.8
(4-stroke)
| 10.8
fl oz |
9.9
(2-stroke)
| 12.5
fl oz |
9.9A
(4-stroke)
| 6.8
fl oz |
9.9B
(4-stroke)
| 12.5
fl oz |
15
(2-stroke)
| 12.5
fl oz |
15A
(4-stroke)
| 6.8
fl oz |
15B
(4-stroke)
| 12.5
fl oz |
18
(2-stroke)
| 12.5
fl oz |
18
(4-stroke)
| 12.5
fl oz |
25
(2-stroke)
| 14.5
fl oz |
25
(4-stroke)
| 9.5
fl oz |
30
(2-stroke)
| 14.5
fl oz |
30
(4-stroke)
| 9.5
fl oz |
40C
(2 cyl)
| 15.9
fl oz |
40D
(3 cyl)
| 16.9
fl oz |
MD40
(TLDI)
| 16.9
fl oz |
50D
(3 cyl)
| 16.9
fl oz |
MD50
(TLDI)
| 16.9
fl oz |
70B
(3 cyl)
| 23.7
fl oz |
70C
(3 cyl)
| 30.4
fl oz |
MD70
(TLDI)
| 30.4
fl oz |
90A
| 30.4
fl oz |
MD90
(TLDI)
| 30.4
fl oz |
115A
| 30.4
fl oz |
| 140A
| 30.4
fl oz |
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