115 hp 2 cycle yamaha oil system

[Boscocat]

How does the system know when to pump oil from the larger main tank to the smaller feed tank on the motor? Is there a float switch located on the smaller engine tank which turns the main pump on when the engine fed tank falls below a certain level. Then when the small feed tank reaches a full level the switch will turn the pump off to prevent over fill and the overflowing of the feed tank.

My Yamaha will fill the feed tank, the pump will pump oil from the main tank only when I engage the toggle switch on engine. I took the alarm sensor out of the small tank and turned it upside down to replicate a full feed tank and to silence the alarm. I turned on the power switch and observed the small tanks oil supply line; I had disconnected it from the tank, but the pump never came on. (no oil) I then turned the sensor upright. the alarm engaged but again the pump never came on and no oil was sent.

I then did the same procedures as above except with the motor at idle, and the pump never came on. Again, if I hold the emergency toggle switch the oil pump comes on and will fill the small feed tank but if I am running at 1/2---3/4 throttle for a while the alarm will sound the motor will slow. I have to remove the cowl and refill feed tank by way of the toggle switch. (WHAT A PAIN) So, is there an oil level sensor associated with this system that regulates the pump to come on and off per the oil level in the feed tank?

Or am I missing some other cause and effect.

Please advise!

[boscoe99]

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[boscoe99]

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[Boscocat]

My wife, 5:30 am on her way to work, saw a kitten get hit by a car in front of her. She stopped and picked him up, since it was late fall it was still dark and she didn.t know if he was dead or what. Well he was so little that his eyes were barely open and he was covered with fleas and was all bones. He looked like a dehydrated new born kitten. She bottle fed him and along with the Vet care he fattened up, got healthy and became a little monster! (: He thinks my wife is his mama and today at 4 years old he will still sometimes, if in the house, jump on the bed at night and lay on top of her and nurse on her pajamas! I named him Bosco, when he was in that little monster kitten stage, after the 1920,s CAT cartoon character "BOSCO". "Lets go Bosco"

You, dog person, help me, cat person, because your a good dog!
No I do not have a Tach. In fact it is my neighbors boat and it is a 1993 Mako w/1993 Yamaha 115 hp. He had a new head installed last year and the thing runs great. The problem is that the only time the center console remote tank pump pumps is when I use the main tanks toggle switch and then the pump purrs along and fills the little main tank. The main tanks top entry alarm switch works when oil level is low or if I remove it from the tank and turn it up side down or push the slide float down with my fingers. The system will shut motor down when alarm goes off. So I assumed there has to be a float switch that activates the pump when oil level is at a certain level. That it must be a failing sensor. Do you have any exploded views showing the systems componets and all that I might see . I know it has to be a faulty sensor or two not telling the pump to come on when oil level is at the activate the pump level.

[99yam40]

Did you not understand what he wrote that will make it do what you are telling us?
Work with just the toggle switch and not automatic

[boscoe99]

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[Boscocat]

Thank you so much for the information and the diagrams. This may be more complex than I thought it was going to be.I may just splice into the toggle switch and run electrical connection to an external toggle and mount it on the center console. Then just use the re-located toggle to activate the pump and transfer the oil from reserve tank to the main tank. I believe that this would work and may also prevent any accdential screw ups on my part trying to trace and correct the automatic function.
Your thoughts as to this approach.

Bosco says---You guys are Perrrrrfectly alright with me because your helping my mama's husband fix a boat to go out and catch me more fresh fish to eat!! "Meow, Meow",which in cat means, yum, yum Fish!!! We live in North Carolina on the intra-coastal waterway between Wrightsville and Carolina Beach, N.C.

[rodbolt17]

why not just fix it????

its a dirt simple system that uses 4 switchs to turn the pump on or off depending on what switch's are closed.

over the years I have beat this to death.

[boscoe99]

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[Boscocat]

Dear rodbolt17,

I would love to fix it! If you could, would, assist me with a step by step process as to the location, isolation and testing of the 4 switches you refer to, I would be very grateful.

I do most of my automobile and other powered equipment repairs but have little to no experience with outboard motors. I was pretty sure, since the oil pump will activate and transfer oil when using the toggle switch, that there has to be a float switch, with high-low parameters, associated with the main oil tank keeping a proper oil supply based on the engines consumption. Since I knew that the pump was good I was pretty certain there had to be a main oil tank level sensor to operate the pump and that the sensor must be bad or have a broken, disrupted, electrical signal, causing the failure of the pumps automatic on/off oil transfer.

Is this float switch in the main tank, which also serves as the lid to the tank and operates the low level alarm, a multi layered switch? By that I mean does it serve as the tanks oil level sensor, cause the pump to come on and off when the tanks oil level is low and also serve as the alarm and safety shut down sensor?

I need a "Yamaha How to for Dummies" I guess. However, once I understand and know all the componets, their locations and how they are wired, the systems harness, I believe I will be able to resolve and repair this automatic oil transfer problem.

Where are the 4 switches located and how are they activated for their specific function?

I realize that I am asking for a considerable amount of your time and effort but I would be most appreciative if your would be so kind as to educate me on this DIY diagonistic and repair on a 1993, 115 H.P,. 2-cycle outboard motor's auto oil system.

Thanking you in advance,

Sincerely,

Boscocat

John Jordan
Wilmington, North Carolina 28409

[99yam40]

Bosco99 posted all that info you are looking for, but you did not take it in to use it so looks like he deleted it.


what a shame as it was up for some time.

My thoughts now are get a service manual or take it in to someone that is capable of fixing it, not jury rigging it

[rodbolt17]

do you have the yamaha digital tach?

[Boscocat]

I printed all the information which Boscoe99 sent and I am going to check the continuity on the 4, wires in the wiring harness that go from the reserve tank back to the main tank sending unit. I know that two of the four, the brown and the blue, are good, have continuity, because the oil pump operates when I use the toggle switch. If the two, black and blk. w/red stripe which go to the sensor test good, have continuity, then the sensor must be defective, I think. The sensor functions properly, I believe, only when the oil level is low. The alarm sounds and the motor will barely run as the system was designed Earlier I pulled the sensor from the tank and slid the float up about half way but the pump never came on, only the alarm worked when the float was at the bottom.

My only question is about the sensor itself. Is it a 3 position float switch?

I understand and appreciate what information has been forwarded to me and I am going to take some long leads and my meter so I can check the black and blk/red wires, from pump to sensor, for continuity today.

Do you agree that if the wiring is good the sensor is bad in part. That is at the mid level where, as I understand it, is the location for the sensor to send signal for pump to run and then when the float reaches the upper level it signals pump to stop.

I apologize if I offended anyone by asking retorical questions but I just want to be through in my understanding of how the system works.

All of you have been very helpful and I do appreciate the help!!

J.J.

[rodbolt17]

you simply don't understand and you wont answer my question.
the remote tank SWITCH has NO alarm functions.
its simply an on or off switch.
however if the oil control module sees an open switch it wont allow automatic oil transfer .