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  #1  
Old 05-09-2016, 04:36 AM
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Cannon51 Cannon51 is offline
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Default 108 with no spark

I was at a friends house a few weeks ago helping him change the deck spindle on his Craftsman grass killer. He ask me to look at his late FIL's 108 that hasn't been cranked in a few years. He bought a new battery for it but it still did nothing when the switch was turned. I crossed the solenoid with some pliers and the engine turned over (switch on) but the spark plug did not fire. I downloaded the tech manual for the wiring diagram and found this diagram of the ignition that Roland posted in the Tech section http://216.157.93.126/forum/showthread.php?t=27 . I think I can figure out the starter problem. Looks like if the starter engages with the solenoid crossed then the problem should be in the switch or one of the 3 safety switches. On the ignition I can run a jumper form battery + to coil + (in Rolands Post) but if it still doesn't have spark is there a simple way to check the points and condenser? This is my first attempt at working on this type ignition, I don't want to fry anything on someones elses tractor.
Cannon
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Old 05-09-2016, 06:17 AM
R Bedell R Bedell is offline
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Unless I m not reading this right, you have two problems. (A) You can't get the engine to roll over, and (B) Once you do by jumpering the starter solenoid, the engine has no spark.

Go to the Technical Library section, page 5, and down load the 1x8/9 Wiring Diagram.

(A) For the start problem. For the Solenoid to engage, the PTO Switch as to be in the "off" position. The Brake Pedal has to be depressed to engage the Neutral Safety Switch. Check these two things out and advise.

(B) For the no spark problem. Clean (file or sand paper) the points to make sure they are "clean", look bright & shiney. IF, the points are so bad, replace them. Gap them for .015-.020" for starters.

Do the above and report back.
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Old 05-09-2016, 06:18 AM
Mike McKown Mike McKown is offline
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Quote:
Originally Posted by Cannon51 View Post

.... is there a simple way to check the points and condenser?
Cannon
Use a test light. Hook the ground to the battery ground post and the probe on the points side of the coil and crank the engine. If the light flashes off/on/off/on, your points are making contact. If the light doesn't flash, clean the points. Go to the battery side of the coil with the ignition switch on and your test light should light. If it doesn't, you have an open in the circuit somewhere.
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Old 05-09-2016, 07:45 AM
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Cannon51 Cannon51 is offline
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Yes Roland I believe there are two problems, I guess they could both be the switch. I did download the manual with wiring diagram. Were supposed to look at it one night this week. I report what I find. Thanks
Cannon
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Old 05-09-2016, 10:29 AM
R Bedell R Bedell is offline
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Quote:
I guess they could both be the switch
Yes, it could be the Ignition (or Key) Switch that would contribute to both problems.
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Old 05-09-2016, 10:41 AM
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sawdustdad sawdustdad is offline
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First thing I do when I got no spark is check for voltage at the coil, then clean the points. It's nearly always the points.
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Old 05-14-2016, 10:52 AM
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Just got home from his house. The failure to engage the starter was because the arm was broke off the brake shaft. I found part of it on the deck. I put a jumper in the safety switch connector and the starter spins the engine fine. I could not get any spark at the plug. With the switch on there is 12 volts at the coil on both sides. With the starter engaged and the test light on the points side the light stays on. I cleaned the points with some emory cloth but it made no difference. I didn't take any feeler gauges with me but the points are opening. I told him I would try to find a part number for the broken arm and get some more information on the ignition. I should have tested the coil but we both had honey do's today and we ran out of time.
Cannon
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Old 05-14-2016, 11:42 AM
R Bedell R Bedell is offline
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The spring actuator is Part No: 932-3000

From the previous links and threads, there is the full 1x8/9 diagram as well as the condensed Kohler diagrams.
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Old 05-14-2016, 04:22 PM
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Alvy Alvy is offline
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Cannon. Make sure that the points are closing. That's when the light should go "off" when probed on negative side of coil. Sounds like they are not closing or no ground situation is occurring.
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Old 11-06-2016, 05:01 AM
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Cannon51 Cannon51 is offline
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I thought I would post an update. I took us a long time to get back on the 108 but yesterday I went over to his house. We got the new brake switch arm installed and after some sanding on the points we got the test light to flash when hooked up as Mike instructed. We had new gas in it but it would never start. I sprayed some carb cleaner in it and it started. I sprayed several shots in the carb but it would not run off the gas. I took the bowl off to find the bowl full of molasses and the float stuck. We never could get the float pin out so I removed the carb and put it in a coffee can of kerosene. I told him to check it in a few days and see if the float pin had loosened up. I had never worked on a points/coil ignition before but with your help we were able to get 2 issues (brake switch arm and spark) fixed. I took a picture for no good reason.
Thanks
Cannon
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