rodbolt

[RetNav]

I have a 1988 Yamaha ProV 150 on a Bass Hawk boat that runs good and idles good. With that statement you are probably wondering "what is the problem?" Top speed is 62 mph on a pitot speedometer at 5800 rpm. Haven't checked yet with GPS.<br />.<br />The previous owner disconnected the oil system and was using premix 50-1. I don't get any tone when I turn on the key and have never heard any type of alarm but am concerned that when it was disconnected all of the alarms was disconnected, therefore no protection at all. <br />.<br />Can you walk me through the procedure for checking out this engine?

 

[rodbolt]

Re: rodbolt

with the oil ingection removed you should get no oil alarms. to test the overheat turn the keyswitch on, dissconect the pink lead at one of the head thermo switches. ground the harness side of the lead with a jumper. the horn should sound.<br /> to test the thermo switches will require a pot of water, a candy thermometer and an ohm meter switch should close about 180*F and open about 150*F<br /> a quick test of just the horn is to crank it with the stop lanyard removed.

 

[RetNav]

Re: rodbolt

I don't get any kind of horn. Just checked and the red wire from both head thermo switches go to a 4 pin white plug that is disconnected. There is also a 7 pin plug (black) that is disconnected. <br />.<br />The oil reservoir and the oil tank on the motor is empty. Plugging both of the above mentioned connectors back in gives me an alarm horn when I turn on the key.

 

[rodbolt]

Re: rodbolt

I would remove the oil tanks, remove the pump then the pump drive shaft and reinstall the pump or buy the block off plate. the wiring I will have to think on a bit. but its not hard to wire around the oil control module. look up a wiring diagram for a C model 150 of that year.<br />but the overheat and oil alarms were seperate. there is a diode that seperates oil from overheat. i dont have a harness diagram here for that old of a motor.

 

[RetNav]

Re: rodbolt

Thanks for your help rodbolt. It looks like they just disconnected all the connectors, one at the main tank, one at the small tank on the motor, and the large 7 pin black connector. The lever that runs from the metering pump arm to the arm on the bottom carb was removed also. <br />.<br />I am looking for a manual for this motor as that will be a large help. <br />.<br />Thanks again..