Part #3 - Oil pressure

[Mith]

Part #3 in the Miths el-cheapo new tractor saga
oil pressure light stays on when engine is running,
pulled the switch yesterday, about 1/2 way up the block. oil came running out the hole. what does it all mean. i would have expected it not to have oil up there if it werent pumping it or whatever. in the milliseconds i had to look at the switch before i had to shove it back in to stem the flow of oil it looked fine. havnt run the engine since.
what should i do. my next action i was thinking of was to change the oil and clean the filter. but need to buy some oil first.

thanks

(btw - cooling seems good, havent run it much yet so i dont know if it overheats but when running the top pipe is hot and the bottom cold)

 

[Jim_Fisher]

Mith,

</font><font color="blue" class="small">( oil pressure light stays on when engine is running,
pulled the switch yesterday, about 1/2 way up the block. oil came running out the hole. what does it all mean. i would have expected it not to have oil up there if it werent pumping it or whatever. in the milliseconds i had to look at the switch before i had to shove it back in to stem the flow of oil it looked fine. havnt run the engine since.
what should i do. my next action i was thinking of was to change the oil and clean the filter. but need to buy some oil first. )</font>

Could be a bad sender, bad wire (rubbed and going to ground), or worn main bearings or oil pump.

Is there room to screw in a mechanical gauge in place of the sender? Might be worth your while to buy an inexpensive mechanical gauge while you are picking up the oil. Then you'll know how much pressure you actually have and some indication of why the light is on.

 

[GaryE]

Mith,

The switch is pretty high up in the block for there to be very much oil there. How much oil would you say came out? A little oil will be in the fittings, oil passage and the switch itself. Maybe a few ml..

I would definitely clean the filter if you have not already done so.

BTW, did you test the switch while you had it out? If not, you need to do so to rule it out.

Hope this helps,

Gary

 

[jimg]

I agree, there shouldn't be appreciable oil that far up when the engine isnt running. How long did you wait prior to pulling the sensor? What you might do it wait say 10 or 15mins and let whatever is there drain back into the pan.

Anyway, Im assuming the pressure sensor is electrical. If so theres no need to pull it off the engine for testing...at least ath this point. Youll need to know what the output range is (in ohms probably). Hook a multimeter to the thing (find some place in the wiring to get a good electrical connection) and see what it reads w/o engine running. Then crank the thing up and see what it reads. Id pay particular attention to see what the readings are when the engine is cranking and what it is once the engine is running normally. If theres no change or its not in the normal range then perhaps the sensor is the problem. If it reading properly then the problem is up stream from the sensor.


BTW whats a Miths? Is this an import?

 

[GaryE]

Jim,

The B6000 just uses a switch and an idiot light. The light goes out if he disconnects the switch, so the wiring is ok. See the previous thread.

Part 2 of this problem!

I am hoping since he has been running this tractor without it self destructing it is a sensor problem.


Gary

 

[Mith]

thanks guys for your suggestions
</font><font color="blue" class="small">( BTW whats a Miths? Is this an import? )</font>
its Mith's, as in belonging to Mith (the tractor is a Kubota B6000)
gary, i dunno how much oil would have come out, when i saw the oil coming out i put the switch back in without doing anything to it, i presumed maybe lots more oil would follow. there was a fair sized bead running down the block after about 2 seconds when it was out.
There is probably room for a mechanical guage, ill look into borrowing one from someone.
As gary said when i take the wire off the light goes off so its not a short.
what if i took the switch out with the engine running and see if oil comes out?
i thionk it may be worth changing the oil and cleaning filters anyway, it may help afterall. need to get some oil first though. Any idea how much it takes?
to test the sensor what do i do, connect the airline to the end and blow air into it? see if it goes off?
Apart from the pump and sensor are there any other possible problems that could cause this?
where is the pump?
thanks

heres part one (with picure of the machine)

 

[GaryE]

Mith,

At this point anyway, I would not start it with the switch out. By doing so you would be running with ZERO oil pressure. Not to mention the mess you would have all over your garage!


I would imagine the switch would trip at about 7 psi, you could easily reach that by blowing into it. The only problem it needs to be grounded to complete the circuit. So you would need to make a connection between the engine block and the threaded part of the switch. If you have a Volt / Ohm meter, it would be much easier and safer to do.


Or if you have access to a mechanical oil pressure gauge it will tell you weather you have pressure or not. But finding the proper thread size might be a problem. Not sure if it is a standard size fitting.


Let us know how you make out,


Gary

 

[Mith]

the maual states it 0.036psi to trp the switch? misprint maybe?
as you say my plan was to completely remove the switch and use a multimeter to test it. im gunna change the oil first to see if that helps then start fiddling. the manual says about changind gaps in something, another plan of attack. gunna get a barrel of oil on saturday.

</font><font color="blue" class="small">( your garage )</font>
I wish!! the garage is used, i got the shed. its big but sure is cold /forums/images/graemlins/frown.gif /forums/images/graemlins/frown.gif
thanks

 

[teddydo]

Gary, you are not talking about blowing into it with your mouth are you? I don't think you can blow that much with your mouth, to check the switch..I like the guage idea. Or the multi meter attached to the connections set on ohms for a brief crank up. teddy

 

[Mith]

</font><font color="blue" class="small">( blowing into it with your mouth are you? )</font>
air compressor