TOHATSU BFT 250A, Service Manual

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MAINTENANCE
GEAR CASE OIL CHANGE
Place the outboard motor on a level surface and
position the outboard motor vertically (with the engine
level).
Tilt the outboard motor up slightly until the drain hole is
at its lowest point.
Remove the oil drain plug bolt [1] and oil check bolt [2],
then check for metal particles on the magnet end.
If there are metal particles on the magnet end of the
drain plug bolt, disassemble and inspect the gear case
assembly:
– Standard rotation type (page 16-8)
– Counter rotation type (page 17-7)
If there is water in the oil, the water will flow out first
when the drain plug bolt is removed, or the oil will be a
milky color. If water in the gear oil is detected, perform a
gear case pressure check:
– Standard rotation type (page 16-45)
– Counter rotation type (page 17-42)
Tilt the outboard motor down until it is vertical.
Install an adapter (STV-334Y: commercially available)
[3] and gear case filler (STV-S33: commercially
available) [4] in the oil drain plug hole, and add gear oil
until it flows out from the oil check bolt hole [5].
Apply gear oil to new O-rings [5] and install them on the
oil level check bolt and drain plug bolt.
After adding gear oil, install the oil check bolt, and then
remove the adapter and gear case filler.
Install and tighten the bolts to the specified torque.
GEAR OIL CAPACITY:
1.47 liters (1.55 US qt, 1.29 Imp qt)
RECOMMENDED GEAR OIL:
MARINE SAE 90 Hypoid gear oil
API Service Classification (GL-4)
TORQUE: 6.5 N·m (0.66 kgf·m, 4.8 lbf·ft)
[2]
[1]
[5] [5]
[5]
[4]
[3]