kohler 11efozd gennie problem

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kashurst

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Afternoon
generator is playing up. Its never been the most reliable machine but this time it has got me and the UK distributor foxed. It starts up instantly, generates 240v output but within a few seconds shuts down with an Over Crank fault (OC on display). I have gone through every connection I can find and stripped and checked the fuel system, relays, fuses etc but I still cant work out whats wrong. Any Kohler experts about?
thanks
 
Had the same problem on a Kohler on a T60 except don't remember an Over Crank fault on the display. It was a sticking thermostat which was solved by removing the thermostat. As I say no OC fault showing that I remember so probably of no help.
 
kashurst said:
Afternoon
generator is playing up. Its never been the most reliable machine but this time it has got me and the UK distributor foxed. It starts up instantly, generates 240v output but within a few seconds shuts down with an Over Crank fault (OC on display). I have gone through every connection I can find and stripped and checked the fuel system, relays, fuses etc but I still cant work out whats wrong. Any Kohler experts about?
thanks
Click to expand...

Hi Kevin, over cranking is a fault on the start up cycle, which can be the speed switch that's faulty or something as simple as the battery that is giving up and lowering the voltage as the starter is demanding too much from the battery.

Try connecting another battery to the genset battery with some jump leads, remember your main engines are 24 volt so be correct where you pick the extra supply up from.

I presume that fuel pump was ok after the plastic drive we made.
 
Are you sure OC means Over Crank, OC commonly means over current - e.g. overloaded.

When it trips has it started providing power ?

Have you measured the actual terminal voltage being produced before a load is applied - could be the open run voltage going too high

Edit

OK it does mean overcrank, basically not starting within an acceptable time period, due to another problem, e.g.lack of fuel. As your engine is starting then I would look to see if somehow the controller is not getting the signal back that it is running - possibly using oil pressure as a signal, or a tapping from the output voltage. Check again for loose wires.

I assume the starter motor is cutting out before it trips.

I will look to see if I can find out how this alarm actually functions.

2nd edit

This might be worth a look at http://beamalarm.com/Documents/power_tech_overcrank_error_code.html
 
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volvopaul said:
Hi Kevin, over cranking is a fault on the start up cycle, which can be the speed switch that's faulty or something as simple as the battery that is giving up and lowering the voltage as the starter is demanding too much from the battery.

Try connecting another battery to the genset battery with some jump leads, remember your main engines are 24 volt so be correct where you pick the extra supply up from.

I presume that fuel pump was ok after the plastic drive we made.
Click to expand...

err i think the above statement about the fuel pump could be a cause if it has been uncooperative previously by the sound of it!!
 
Thanks for the replies
Tried VPs suggestion re battery but still no good. The fuel pump is still working great after our little fix. The annoying thing is the generator bursts into life instantly, outputs 230v perfectly, all looks OK then it decides its not spinning around and turns itself off after @5 secs.
Flying home this evening so bringing back the electronic controller to get it tested. And hopefully learn a bit more about how the software works and why it faults OC.
 
kashurst said:
Thanks for the replies
Tried VPs suggestion re battery but still no good. The fuel pump is still working great after our little fix. The annoying thing is the generator bursts into life instantly, outputs 230v perfectly, all looks OK then it decides its not spinning around and turns itself off after @5 secs.
Flying home this evening so bringing back the electronic controller to get it tested. And hopefully learn a bit more about how the software works and why it faults OC.
Click to expand...

Kevin. Look around the rear of engine there may be a magnetic speed sensor pickup that could be somewhere around the bell housing its a speed sensor. Could be that or bad wiring that's not sending a signal back to the controller, it will pull the stop solenoid shutting the engine down. Try that.
 
VP - just been talking to Kohler about the problem. There isn't an RPM sensor on this particular model, it derives speed from other parts of the machine, I think the generator outputs. They suspect it may be the controller from what I have described so I have sent it to them for testing and probably a great big bill, but you never know it could still be something simple that I have missed. Re Superheat - it behaves very similarly to the detail in the link you gave, but no unusual noises. As far as I can tell the starter is disengaging. I even disconnected the starter solenoid from the controller and jump started the diesel engine whilst pressing run. End result the same. Thanks all for the help
 
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