TOHATSU 40 - Page 87

POWERHEAD
4-13
3-/ 4-Cylinder
If tester indicates no continuity (switch open), loosen
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
a T-fitting (obtain locally), install a water pressure gauge
between the sensor and the hose.
WARNING
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
2
]. If switch opens at lower over higher
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
2
].
• Gradually tighten adjustment screw until tester indicates no
continuity (switch open).
4
5
T1174
T1175