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Kohler Kt17 No Spark Issue


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#1 twostep OFFLINE  

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Posted March 22, 2013 - 09:05 AM

Background:

As any of you know that have seen my rebuild thread, I just finished rebuilding my 682 and 44C mower deck. During the rebuild I also rewired the tractor (new schematic can be found here: http://gardentractor...build/?p=286995). Now that it is back together I am not getting any spark.

 

Switch:

I can not find any reason this would cause a no spark issues since coil is getting 12v.

 

Coil:

Coil tests good according to this:

http://gardentractor...ng-kohler-coil/

 

and to the service manual found here:

http://www.kohlereng...series=K-Series

 

Primary resistance: 4.5 Ohms

Secondary resistance: 9600 Ohms

 

Points:

The points are opening and when I put a test light on the coil's negative coil post it flashes on and off as the engine turns over. I pulled the points cover off and they were pretty dirty. By the way, one of the last things I did before tearing it down was pressure wash it... Anyway, I cleaned up the points and ran a piece of fine sand paper between them. Blew them off and put them back on... still nothing. I didn't check the gap since I didn't figure that would have changed since before tear down. After putting the points back on I cranked over the engine and noticed arcing when the points closed is that normal?

 

Condenser:

Not tested... I don't have an analog multimeter.

 

Plug Wires:

They show infinate resistance from the coil end to the plug end... isn't that a problem? The service manual does not show any spec on them.

 

Now, what am I not checking? What am I missing?



#2 BairleaFarm OFFLINE  

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Posted March 22, 2013 - 10:12 AM

Got didn't mention the plug. Bad plugs maybe.

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#3 JRJ OFFLINE  

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Posted March 22, 2013 - 10:12 AM

I don't know what you are missing but I would remove and replace all the wire connections that has anything to do with the point, just clean up the connedtion better than before, it's got to be right in that area.

 

 

 

Dick


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#4 twostep OFFLINE  

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Posted March 22, 2013 - 10:39 AM

I checked with a plug and with just a screw driver stuck up into the plug wire... no spark to ground. The plugs do need changed though.


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#5 Texas Deere and Horse OFFLINE  

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Posted March 22, 2013 - 10:57 AM

Bobby , could it be that you don't have enough amperage at the coil. I have had issue where I saw12Vt. at the coil, but didn't have a good connection. Try putting a jumper from the Battery to the coil and see if you have spark then.


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#6 twostep OFFLINE  

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Posted March 22, 2013 - 11:01 AM

Thanks Brian, I will try that. 

 

Points:

After putting the points back on I cranked over the engine and noticed arcing when the points closed is that normal?

Anyone have any comment about this?


Edited by twostep, March 22, 2013 - 11:01 AM.

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#7 Lmiller3358 OFFLINE  

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Posted March 22, 2013 - 11:01 AM

Sounds like you're missing a ground somewhere from the points maybe ? I had that problem on a kohler my Dad had been working on !!!



#8 Texas Deere and Horse OFFLINE  

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Posted March 22, 2013 - 11:04 AM

Where did you see the arcing at ?



#9 twostep OFFLINE  

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Posted March 22, 2013 - 12:35 PM

Where did you see the arcing at ?

 

Between the points contacts.



#10 Texas Deere and Horse OFFLINE  

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Posted March 22, 2013 - 01:45 PM

If you are getting a spark between the points but not at the plugs, it sounds like a bad condenser to me.


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#11 Guest_gravely-power_*

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Posted March 22, 2013 - 02:00 PM

If you are getting a spark between the points but not at the plugs, it sounds like a bad condenser to me.

Ditto on the condenser. The points will arc. No big deal. They are made to do that.


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#12 JDBrian OFFLINE  

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Posted March 22, 2013 - 03:15 PM

If you have infinite resistance in the plug wire then you won't get a spark. Even resistor wires should show continuity shouldn't they? I'd also check to make sure you have a good connection from the engine chassis back to the battery - terminal. 


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#13 twostep OFFLINE  

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Posted March 22, 2013 - 11:30 PM

Did some more digging tonight. I tested the JD's condenser and even with my digital multi I was able to see some reaction. When I tested the Cub's I got nothing at all. This leads me to believe that the cub's is shot.

 

I also did the same thing with the plug wires and got the same results; JD's showed 2-3 Ohms and Cubs showed nothing... neither of them. The fact that both of them... AND the condensor would go bad is highly unlikely. I'm researching the resistor type wires now.



#14 JDBrian OFFLINE  

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Posted March 23, 2013 - 06:23 AM

Do you have a capacitance range on the meter. If not it's hard to get a good indication of the capacitors condition. They should read as an open circuit on an ohm meter. Even if they are resistor wires they should not be such a high resistance that they read an open circuit. You need to have enough current flow to create a good blue spark. Perhaps they were physically damaged. The ends are most likely where the problem is. Check the wire connections inside the boots. 


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#15 twostep OFFLINE  

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Posted March 24, 2013 - 06:37 PM

IT LIVES! swapped the JD's condenser over to the cub and it fired up.

 

Thanks for the info Bryan. I agree that I should be able to see some resistance in the wires but they aren't... I guess I'll change them and the plugs before mowing season.

 

Thanks again for all of the help guys!


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