TOHATSU BFT75A Service Manual page 85

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MAINTENANCE
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 check bolt [1], oil drain plug bolt [2], and
drain the old oil.
Check for metal particles on the magnet end [3] of drain
bolt.
If there are metal particles on the magnet end of the
drain plug bolt, disassemble and inspect the gear case
assembly (page 16-5).
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 (page 16-42).
Tilt the outboard motor down until it is vertical.
Install a commercially available gear case filler (STV-
S33) [4] and filler adapter (STV-334Y) [5] in the oil drain
plug hole, and add gear oil until it flows out from the oil
check bolt hole.
GEAR OIL CAPACITY:
0.95 liters (1.00 US qt, 0.84 Imp qt)
RECOMMENDED GEAR OIL:
MARINE SAE 90 Hypoid gear oil
API Service Classification (GL-4)
After adding gear oil, remove the gear oil pump.
Apply gear oil to new O-rings [6] and install them on the
oil level check bolt and drain plug bolt.
Install and tighten the bolts to the specified torque.
TORQUE: 6.5 N·m (0.66 kgf·m, 4.8 lbf·ft)
3-8
[2]
[3]
[6]
[5]
[1]
[2]
[4]