TOHATSU MFS 25D Service Manual page 170

Power Unit
3. Inspection Items
1) Inspection of Compression Pressure
1. Refer to "Inspection of Compression Pressure" in
Chapter 3.
Compression Pressure (reference value):
At 500 min
With decompressor: 0.50 MPa (73 psi) [5.1 kgf/cm
Without decompressor: 1.40 MPa (203 psi ) [14.3 kgf/cm
2) Inspection of Oil Pressure
1. Place a rag below the oil pressure switch.
2. Disconnect the oil pressure switch lead wire 1 , and then
remove the oil pressure switch 2 .
If the removed lead wire is grounded on the
body, a low oil pressure error will occur.
Connect the oil pressure gauge 3 (sold commercially) to
3.
the switch hole.
Use a commercially available oil pressure gauge.
The thread size should be R1/8 (BSPT1/8) and
allow a pressure of 1 MPa (142 psi) [10 kgf/cm
to be measured.
4. Start and run the engine for 5 minutes to warm up the
engine at the idling revolution speed.
5. Measure the oil pressure. If the pressure is below the
specified value, check the oil pump, oil leakage, and oil
strainer.
Oil Pressure (Reference value):
At 850 min
At 4000 min
6. Install the oil pressure switch and tighten to the specified
torque.
Apply a screw locking agent (ThreeBond 1327) to
the screw thread a of the oil pressure switch.
Oil Pressure Switch:
8 N · m (5.9 lb · ft) [0.8 kgf · m]
7. Install the oil pressure switch lead wire.
Oil Pressure Switch Screw:
1.6 N · m (1.2 lb · ft) [0.16 kgf · m]
5-30
(rpm)
-1
CAUTION
(rpm): 0.21 MPa (30.5 psi) [2.1 kgf/cm
-1
(rpm): 0.24 MPa (34.8 psi) [2.4 kgf/cm
-1
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4st 25/30 2022