Tractor Burning Out Glow Plugs: Kubota Review  -- Kubota Tractors Discussion Forum and Review Tractor Burning Out Glow Plugs: Kubota Review -- Kubota Tractors Discussion Forum

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 10-06-2001, 19:27 Post: 32252
Moore



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 Tractor Burning Out Glow Plugs

My tractor wouldn't start last. Replaced battery but still wouldn't start. Checked injectors, which were fine. Checked glow plugs, which indicated bad. I replaced all three glow plugs and it started fine. Next day went out and it wouldn't start. Checked glow plugs and they are bad again. Does anyone know what would cause the tractor to be burning out glow plugs? Thanks for your help!






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 10-06-2001, 21:59 Post: 32255
Richard Harburn



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 Tractor Burning Out Glow Plugs

See if there is a glow plug relay that is keeping voltage on the glow plugs after the tractor has started. The relay would provide voltage to heat the glow plugs and then automatically cut off when the engine starts.






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 10-07-2001, 06:52 Post: 32257
TomG

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 Tractor Burning Out Glow Plugs

I'm guessing that the tractor is a reasonably modern one that was built with a 12V system rather than one converted from a 6V system. Anyway, if the glow plugs stayed on they would certainly burn out. They probably also would run down the battery and may damage the pre-combustion chambers as well. I'm curious how the plugs were determined to be bad. My repair manual gives some resistance values that can be used for tests. I believe it's also common to remove a plug and hold the base against the engine block while the pre-heat is on. If it's good, it will glow. As I understand, glow plugs don't get weak, they either work or they don't. I suppose there is a possibility that a very poorly running engine could carbon up the plugs, which would prevent them from working. However, Id expect that operating the plugs would keep any carbon deposits burned away. Maybe somebody else has experience here. Anyway, it's really good to have a repair manual so a wiring diagram is available and proper tests are described. I would find out if a relay is present and also what the proper resistance values are, and then test the system with an ohmmeter. There's a possibility that some systems could have a resister in series with the plugs that might be shorted. In such a case, the plugs would be getting too much voltage.

I checked the wiring diagram for my Ford 1710. There is no relay for the glow plugs, but shorted contacts in the starter switch would do it. However, I believe the indicator light would function and remain lit even with the starter switch off. At any rate, if there's any doubt, I'd disconnect the battery ground cable and put an ammeter across it to check for battery drain with the starter switch off. Any reading greater than a few 10's of mill-amps indicates something that could use some attention. Mine measures 1.2ma. Glow plugs probably draw in the 10's of amps range.






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 10-07-2001, 20:38 Post: 32270
Brent Pepper



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 Tractor Burning Out Glow Plugs

I had the same problem with a Hinomoto E202(cousin to he Massey 1020). The key switch was bad. I replaced the switch and the problem went away. What kind of tractor do you have?

Brent

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 10-07-2001, 20:45 Post: 32271
Moore



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 Tractor Burning Out Glow Plugs

The tractor is a Kubota B1750. I don't think it's the switch because when you turn it to warm up the glow plugs, the indicator light lights, and when you release it and when it was started, the light goes out. So, don't believe that it's engaging them all the time.






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 10-07-2001, 21:35 Post: 32273
Brent Pepper



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 Tractor Burning Out Glow Plugs

Mine did exactly the same thing. On my tractor when you turned the switch to the "ON" position it automatically lit the glow plugs(a light would come on) for a certain amount of time and then turn them off(light went out). The light worked like normal but the plugs were shot. I called the local Massey dealer and disribed the problem and he told me without hesitation it was the switch. Yours could be a different problem. It is kind of hard to experinment your way to solution when when the outcome is 3 burnt out glow plugs each time you are wrong.






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 10-08-2001, 07:02 Post: 32274
TomG

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 Tractor Burning Out Glow Plugs

On my 1710, the glow-plug indicator doesn't light until the plugs come up to temperature--after around 15-30 seconds of pre-heat. As near as I can figure, the indicator light is hooked in parallel with the plugs. The resistance of a filament starts out low and increases as it heats. Im guessing the way it works is that the parallel plugs/light network doesn't drop enough voltage to light the indicator until the resistance of the plugs increases with heating. At any rate, the indicator light connections do not run through the starter switch, and the indicator should function irrespective of the switch condition and light whenever the glow plugs are getting current and are heated. Of course, an indicator light circuit could be designed in other ways, and that's why it's good to have wiring diagrams. In my case, if the glow plug contacts in the starter switch were shorted, I believe the indicator light would remain on even with the tractor completely shutdown.






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 10-08-2001, 09:52 Post: 32277
Bird Senter

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 Tractor Burning Out Glow Plugs

You're right, Tom, they're wired differently on different tractors. On my Kubota, turning the key "On" doesn't heat the glow plugs. You have to turn it a little further and hold it (spring loaded switch), the light comes on immediately and you just turn it further to "Start" when you think the glow plugs have heated enough (about 4 seconds if the engine is cold).






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 10-09-2001, 07:27 Post: 32312
TomG

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 Tractor Burning Out Glow Plugs

Yes, I think the pre-heats on these new tractors are faster than my mid-80's Ford, although in Bird's case it may be Texas sunshine compared to my northern gloom. On my Ford, the switch is turned to the left and held until the indicator light glows and then is turned past centre to the right to start. The design on Bird's Kubota seems a bit more reliable than my Ford, even if it doesn't tell you when the plugs come up to temperature. On the other hand, with the short pre-heat required, I guess such a feature wouldn't be very helpful. However, in both cases it sounds like the indicator light would come on when ever the plugs are getting voltage, which should be a decent test if there's the possibility the plugs may be continuously on.






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 10-09-2001, 09:25 Post: 32318
Art White



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 Tractor Burning Out Glow Plugs

All thats needed is to check to see if the glow plugs still have power to them after starting the engine. Yes your switch could be bad.






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

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