I need help Oil Pressure sender? - SailNet Community
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I need help Oil Pressure sender?

I have a question about my newly installed 2GM20F.
I just installed this engine last month. It came with its own electrical panel and looms. It was a good running take out, from another sailboat
The Buzzer in the old engine I took out would sound the second I turned the key on. Once I pushed the start button and gained oil pressure the buzzer would turn off. The new engine does not do that? I am afraid to run the engine long as I may or may not have oil pressure. So here is the question. Is there a way to check the pressure switch with a meter? It screws into the block just under the oil filter base and has one wire connected to it. I know the buzzer is good. It will sound with the toggle switch on the interments panel.
So I need to know if there is a way to test the switch. And please explain step by step. I know nothing about electrical stuff. I am trying to learn and I am reading a lot of books and watching u-tube how to vid to try to get better at it.
Thanks for your help.
Capt. Curt
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post #2 of 9 Old 10-30-2013
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Re: I need help Oil Pressure sender?

The sender unit should have variable resistance to ground depending on the oil pressure. In the case of a buzzer, it should have low resistance when there is no/low oil pressure (which allows a path to ground, closed switch) and the sender should open the switch to ground when there is oil pressure. This is a generalization. Resistance is measured with an ohm meter. Put one lead of the ohm meter on the electric contact on the sender and the other lead on the engine block. The reading should be a closed switch, or very low ohms. Now have someone start the engine and see if the ohm reading goes higher. An alternative is to screw out the sender unit, put your finger over the hold and have someone start your engine momentarily and see if oil squirts out.

I don't understand the toggle switch test on the instrument panel. On my boat, when I turn the key to the run position, it energizes all the gauges and the low oil pressure buzzer sounds.

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post #3 of 9 Old 10-30-2013
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Re: I need help Oil Pressure sender?

Curt

I am hoping it might be this simple, so please forgive me for asking.

Is the switch that "turns off" the alarms in the correct position?

(this is the on;u pic I have of the panel - sorry. It still had the plastic on it.)



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post #4 of 9 Old 10-30-2013
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Re: I need help Oil Pressure sender?

Just to be sure I understand, you're not getting the buzzer key on, engine off?

If so I had the same problem. The wire at the sender was corroded.

I would take a look there first, then at the back side of the panel. After that I'm thinking you have to do some continuity checking.

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post #5 of 9 Old 10-30-2013
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Re: I need help Oil Pressure sender?

Try connecting the sender wire to ground at the engine end - that should turn on the buzzer and warning light. If it does, the wiring is OK and it's probably the sender. If not, the problem is in the wiring.

Note that Yanmar engine harnesses can have several sets of connectors between the engine and the control panel (mine has 7 (yes, seven!) in all including an extension cable and three different plugs right at the panel). Find/check/clean each of them to be sure.

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Re: I need help Oil Pressure sender?

Quote:
Originally Posted by erps View Post
I don't understand the toggle switch test on the instrument panel. On my boat, when I turn the key to the run position, it energizes all the gauges and the low oil pressure buzzer sounds.
On my Panel there is a toggle switch that if held in the up position will sound the budder and make the charge light Oil Pressure light come on? Both the old one and the newer one workid like this,
See in the photo just above the start button.
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Re: I need help Oil Pressure sender?

Quote:
Originally Posted by rikhall View Post
Is the switch that "turns off" the alarms in the correct position?

(this is the on;u pic I have of the panel - sorry. It still had the plastic on it.)


Please see my note to erps.
Yes its in the correct position thow its a earler style.
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Re: I need help Oil Pressure sender?

Thanks for all the help.
I will go after work and try no start/key on led to ground and see if it buzzes.
If not I will I will pull the sender out of the engine I just replaced and see if thet sender works. If not I will go to the back side of the switchand start there.


Thanks again.



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post #9 of 9 Old 10-30-2013
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Re: I need help Oil Pressure sender?

Quote:
Originally Posted by ltgoshen View Post
Thanks for all the help.
I will go after work and try no start/key on led to ground and see if it buzzes.
If not I will I will pull the sender out of the engine I just replaced and see if thet sender works. If not I will go to the back side of the switchand start there.
You don't need to go to that trouble just yet..

Disconnect the wire off the back of the sender, clamp it to the engine chassis (ground) somewhere close by and turn the ignition on (don't start the engine!). The buzzer and "low oil" light should turn on. If they don't, the problem is not the sender, but somewhere in the wiring.
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