SnowRidge
Elite Member
For some reason when i preheat, it dosn't glow but the glow plugs get warm but in no way hot as they should be, first i thought the connections so i cleaned all of them and same problem, the little coil does not glow even if i preheat for 40 seconds, it still takes about 3 tries to start the thing, i know its below freezing but i can't remember it ever being this hard. my fear is that the glow plugs are damaged (previous owner used starting fluid...ALOT), my other thought was the coil could need replacing. but these are just ideas, thanks for any help
Is this machine new to you, and have you ever started it under the current conditions and had it do other than what it is doing now? How are you determining the glow plugs are warm, not hot? There is no way to tell with the plugs in the engine, as the head sinks all of the heat they produce before you could feel it on the plug body with your fingers, if that is what you are doing.
It is not that uncommon to not be able to see an indicator coil glow in the daytime, even though it is conducting. You could try a new one and see if that helps. The old one may have aged enough that it does not conduct as well as it should.
Glow plugs on engines with indicator coils are usually wired so that the plugs are in parallel with each other, but in series with the indicator coil. The only failed component other that the switch that would result in no glow plug activity at all would be the indicator coil. However, I have seen one Kubota wiring diagram that showed the plugs in series with each other, a resistor, and the coil. That kind of lash up would result in no glow plug activity if any of the components failed.
As has already been posted, glow plugs almost never fail. Difficult starting in below freezing weather is not all that unusual for diesels, especially if their compression is down a little bit. That may be what is going on.