TOHATSU 40 Service Manual page 87

If tester indicates no continuity (switch open), loosen
4
adjustment screw (4) just enough so the switch button does
not make contact with the diaphragm pressure button. If still no
continuity, replace the sensor assembly.
4. Disconnect the INPUT hose from the sensor fitting. Using
5
a T-fitting (obtain locally), install a water pressure gauge
between the sensor and the hose.
Make sure all hose connections are tight and all
test leads and equipment are clear of powerhead
linkage and flywheel.
5. Start and idle engine in NEUTRAL.
6. Slowly increase engine speed. Take pressure reading when tester
indicates no continuity (switch open). Switch should open at 4.3 psi
[29.4 kPa / 0.30 kg/cm
pressure, continue as follows:
• Fully loosen the adjustment screw.
• Set and maintain throttle position so water pressure is at 4.3 psi
[29.4 kPa / 0.30 kg/cm
• Gradually tighten adjustment screw until tester indicates no
continuity (switch open).
3-/ 4-Cylinder
WARNING
]. If switch opens at lower over higher
2
].
2
POWERHEAD
T1174
T1175
4-13