Tecumseh Spark Mystery

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  #1  
Old 10-08-03, 06:59 PM
konaka
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Tecumseh Spark Mystery

I have a 29 year old Snapper rear engine rider with a Tecumseh engine. No idea what size or horsepower.
It produces no spark when I clamp the spark plug to the engine block. It produced a tiny little spark when I hold the plug wire really close to the engine block.

Here's what I know about the the ignition, which is an internal points and magneto version:
1. Holding plug wire close to ground makes a SMALL spark
2. Clamping plug to ground produces NO spark
3. Tried several spark plugs that I know work
4. The condensor has been replaced
5. The points have been replaced
6. The points have been cleaned with clean paper to remove any oil
7. The timing has not been messed with, so it should be fine
8. The magnets in the flywheel are fine and gave them the screwdriver test per Tecumseh tech hand book

Please help!
Thanks!
 
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  #2  
Old 10-08-03, 07:47 PM
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tae
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how old is the plug wire?
 
  #3  
Old 10-08-03, 08:00 PM
konaka
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the plug wire is same age as mower, but thats not the problem.

Ok, I got the spark plug to spark nice and blue by disconnecting some wires, which i think are either the kill wire, or the wires that charge the battery, eitherway, they were shorting things out and I'll have to solve that later.

I put the plug back in and the engine fired one time, then no matter what I did, it wouldn't start again. I sprayed WD40 in the piston where the spark plug goes in, and i also tried spraying wd40 in the air intake (which works on every other engine i have) - no luck...

now what?
 
  #4  
Old 10-08-03, 11:31 PM
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Hello konaka!

The wire you disconnected is the kill wire. It is shorting through the switch, or somewhere along the wire it could be pinched or chaffed, causing a short to ground.

The problem now...has it stopped sparking, or is it still sparking?

WD40 doesn't work well for starting engines. Try a squirt of gas. Let us know if it runs for a second or two when you do this.
 
  #5  
Old 10-09-03, 04:37 AM
Fisher
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Look at the flywheel key, it could now be sheared due to
insufficient torque of the flywheel nut.
Fish
 
  #6  
Old 10-09-03, 10:47 AM
Joe_F
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Thumbs up

"Fish":

Good to see you back, old buddy.
 
  #7  
Old 10-09-03, 04:30 PM
Fisher
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Yeah, just thought I'd whip out my "flywheel key" response!

Fish
 
  #8  
Old 10-09-03, 05:06 PM
konaka
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running - barely

I checked the fly wheel key and it was sheared. way to go fisher!

I flipped the key around backwards in the semi-circle key hole just to see if i could get it started and it started no problem.

i torqued the flywheel nut to 40ft-lbs. I checked in the Tecumseh manual and it said for aluminum flywheels that 45 is the spec.

So the engine runs, but it smokes like crazy when it is first starting and when it shuts down. not sure what color the smoke is just yet, but when it started it was black smoke.

I think black smoke means mixture is too rich and white smoke is burning oil, so ill keep checking the color of the smoke when i start it and when its running.

Can I put RESTORE or other oil additives to get the engine

THANKS FISHER!
 
  #9  
Old 10-09-03, 11:15 PM
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Good job Fish!

I didn't know you had the flywheel off.

Don't use the oil additive...I answered that question in your other post in more detail.
 
  #10  
Old 10-10-03, 05:53 PM
Fisher
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Just went with the clue of a 29 year old Tecumseh, and the points
are located under the flywheel. On some of them anyway.
But my flywheel key response has been good to me, so I have
to stick with it!
Fish
 
  #11  
Old 10-10-03, 10:41 PM
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LOL, well chalk another one up for "the flywheel key response"!
 
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