Replacement Of Gear Oil - TOHATSU MFS 25D Service Manual

9) Replacement of Gear Oil

1. Tilt up the outboard motor a little as shown.
Place the drain oil pan below the lower oil plug 1, remove
2.
the lower oil plug, and then remove the upper oil plug 2 to
drain away the oil.
Remove the lower oil plug first when draining.
3. Check the viscosity and the gear oil to see if there are any
metal particles or discoloration (clouding). Check the lower
unit internal components if necessary.
4. Tilt down the outboard motor to the vertical position, and
fill with gear oil (via an oil tube or pump) through the lower
plug hole until gear oil starts to spill out from the upper oil
plug hole a and no air bubbles remain.
Recommended Gear Oil:
OIL
Tohatsu Gear Oil
Recommended Gear Oil Grade:
API: GL-5 SAE: #80 - 90
Quantity of Gear Oil:
460 ml (16 US fl.oz.)
• Use the lower plug hole when filling with gear
oil. The upper hole cannot be used because air
cannot be purged and oil cannot be supplied.
• Be sure to tilt the outboard motor to the vertical
position or otherwise the specified quantity
cannot be filled.
5. Install a new gasket and upper oil plug, then install a new
gasket and the lower oil plug immediately.
Install the upper oil plug first when refilling ends.
Oil Plug:
4 N · m (3.0 lb · ft) [0.4 kgf · m]
4st 25/30 2022
3 Gasket
Do not reuse.
3
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