Oil Pump Inspection - TOHATSU BFT250A Service Manual

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Make sure the oil pressure adapter O-ring [1] is in good
condition. Install and tighten the oil pressure adapter [2]
to the specified torque.
TOOL:
Oil pressure adapter,
22 x 1.5 mm
TORQUE: 9 N·m (0.9 kgf·m, 6.6 lbf·ft)
• Over-tightening will damage the threads.
Attach the oil pressure gauge, MT37A [3] to the quick
disconnect, AT77AH [4].
TOOLS:
Oil pressure gauge MT37A
Quick disconnect, AT77AH
Remove the propeller:
– Standard rotation type (page 16-6)
– Counter rotation type (page 17-5)
Run the outboard in a test tank with the water level at
least 4 inches above the anti-ventilation plate. Allow the
engine to warm up to normal operating temperature,
and then measure the oil pressure.
OIL PRESSURE (Pressure check at 650 ± 50 min
(rpm) in neutral:
117 – 176 kPa (1.2 – 1.8 kgf/cm
If the oil pressure is lower than specification, check the
oil pump rotors and oil pump body for wear (page 12-
13).
Remove the special tools.
Replace the sealing washer with a new one, and install
the sealing bolt. Tighten the sealing bolt to the specified
torque.
TORQUE: 54 N·m (5.5 kgf·m, 40 lbf·ft)
Install the removed parts in the reverse order of
removal.

OIL PUMP INSPECTION

INNER ROTOR-TO-OUTER ROTOR
CLEARANCE
Measure the inner rotor-to-outer rotor clearance.
STANDARD:
0.04 – 0.16 mm (0.002 – 0.006 in)
SERVICE LIMIT:
0.20 mm (0.008 in)
07APJ-ZY3A101
Commercially
available
Commercially
available
-1
2 , 17 – 26 psi)
LUBRICATION SYSTEM
[2]
[1]
12-13
[4]
[3]