Does not start when hot

   / Does not start when hot #1  

czechsonofagun

Elite Member
Joined
Jun 23, 2006
Messages
3,268
Location
Old Dominion
Tractor
Kubota B1750
I started having issues with my Kubota. It simply does not start when hot. It starts easily and fast when cold - after holding for the heat plug - but while hot, the battery barely turns it over and it will not start.

The oil level is good, the coolant too and according to the display, the temperature never goes higher than half.

Opinions? I just don't understand why the battery would be weaker after running the engine for an hour.
 
   / Does not start when hot #2  
Maybe the battery is shot? How old is it?
 
   / Does not start when hot #3  
Will it start if you jump it from another known good source?

Have you checked to see if the starter is possibly getting warm and failing? Can you access the battery connection on your starter with jumper cables? Does it also by-pass the starter solenoid. If yes and if you can safely connect them try jumping direct to the starter. This will remove your battery and solenoid from the equation.

Some electrical components get weaker and or fail when they get warm.

Roy
 
   / Does not start when hot #4  
Will it start if you jump it from another known good source?

Have you checked to see if the starter is possibly getting warm and failing? Can you access the battery connection on your starter with jumper cables? Does it also by-pass the starter solenoid. If yes and if you can safely connect them try jumping direct to the starter. This will remove your battery and solenoid from the equation.

Some electrical components get weaker and or fail when they get warm.

Roy

good advice- I'd start there too.
 
   / Does not start when hot #5  
How many hours are on it? I would start off looking at all of the electrical connections, mainly the heavy power wire going to the starter and the ground wires (engine to frame and battery to frame). After that if it has a number of hours on it I would look at the starter.

I would even look at the charging system, I had a problem once where the alternator was over charging the battery. It would heat the battery out and it's performance would drop. After about 20 minutes it started smelling like sulfur and actually boiled off the acid.
 
   / Does not start when hot #6  
Sounds like a "heat soaked"worn starter.Not at all that uncommon.Good Luck!
 
   / Does not start when hot
  • Thread Starter
#7  
Thank you, guys. The starter tries to turn it, but feels like the engine gives too much resistance to it - I didn't get to it with voltmeter, that's the next step.


Bottom line - and my greatest fear is seized engine.
 
   / Does not start when hot #8  
Thank you, guys. The starter tries to turn it, but feels like the engine gives too much resistance to it - I didn't get to it with voltmeter, that's the next step.


Bottom line - and my greatest fear is seized engine.

But your saying it has no starting issues cold? I would think it wouldn't "feel" or "sound" right on start up?
 
   / Does not start when hot
  • Thread Starter
#9  
Well, battery shows 12.1V and Kubota will not start anymore. Looks like it is the battery - if it starts with jumping cables I will know for sure.

That said, the battery is the narrow one 10x6 inches or so - replacement from TSC? What battery do you run in your Kubota?
 
   / Does not start when hot #10  
My Kioti had problems with battery terminal/lugs. After awhile, the clamps were not making a good electrical connection with the batt terminal. Cleaned post and inside of clamp and worked ok. Eventually, changed to truck batt and replaced cable lugs to match and now have no problems. Using OEM fittings, was getting a shiney surface material that would restrict flow to batt, even when boosting.
 

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