M4 071D won't restart when hot

[Gui272]

Hello all,

i'm having an issue with my M4. If i run the tractor, get it up to operating temp, then shut it down, it will not start back up. I have to let it site for a good 30 minutes plus at times before it will fire back up. My dealer has look at it multiple times, they came to the house etc and it's still happening. They are helping me and i appreciate it but i need it to work properly.

Anyone out there having this issue or had this issue and it got fixed?

thank you!

 

[mike0000]

It may help if you give a bit more info on exactly what it’s doing.” It will not start back up” can be interpreted in different ways. when it fails to start will it do anything, will the starter turn the engine over, etc.

 

[Gui272]

It may help if you give a bit more info on exactly what it’s doing.” It will not start back up” can be interpreted in different ways. when it fails to start will it do anything, will the starter turn the engine over, etc.

It doesn't attempt to start, turn over or anything. Dash lights up, everything electric works, it just won't start up. It takes anywhere from 20 to 40 minutes for it to stat back up. Once it's running again, it works fine.

 

[mike0000]

Probably things already being checked by you and the dealer, I’d start with battery, cables, grounds. I’d check if voltage is going to starter while attempting to start, faulty ignition switch is a possibility. Starter cold also be your problem.

 

[GeoHorn]

I had a Volvo that did that. Turned out to be a cracked coil (armature or field…don’t recall exactly)…which when heated up…expanded and the continuity in the coil was lost. Cooled back down..continuity restored and things worked again.

I’ve also seen this occur on various solenoids in different equipt than tractors. (Old points-type ignition coils used to be famous for this type failure.)

Your terminology is causing confusion in our attempts to help you. What it appears you are saying is…. the STARTER MOTOR FAILS TO rotate the engine for starting. You are NOT saying the engine fails to start. ??

 

[Gui272]

Probably things already being checked by you and the dealer, I’d start with battery, cables, grounds. I’d check if voltage is going to starter while attempting to start, faulty ignition switch is a possibility. Starter cold also be your problem.

They checked all of that a couple times already.

 

[Gui272]

I had a Volvo that did that. Turned out to be a cracked coil (armature or field…don’t recall exactly)…which when heated up…expanded and the continuity in the coil was lost. Cooled back down..continuity restored and things worked again.

I’ve also seen this occur on various solenoids in different equipt than tractors. (Old points-type ignition coils used to be famous for this type failure.)

Your terminology is causing confusion in our attempts to help you. What it appears you are saying is…. the STARTER MOTOR FAILS TO rotate the engine for starting. You are NOT saying the engine fails to start. ??

#3 I thought was clear. Nothing happens other than the lights work. I can turn the key and it does nothing for 20 to 40 minutes.

 

[Mroberson]

#3 I thought was clear. Nothing happens other than the lights work. I can turn the key and it does nothing for 20 to 40 minutes.

What was the verdict on repair?

 

[gmkonie]

What was the verdict on repair?

I also have a M4-071. It has 98 hrs on it and it does the same thing. It starts up with a cold engine and runs/performs great, as long as I don't turn the engine off. With the engine warmed up at normal operating temperature, it runs fine. Turn the engine off and try to restart it, the engine will not restart. First, it will not turn over with the starter. Everything else in the tractor that is supposed to work with the key on works normally. But with the engine at normal operating temperature, it will not crank. Let the tractor cool off completely, it starts just fine. And it must cool off completely.
I have spoken to service departments at two different Kubota dealerships, they cannot help me.