Tecumseh Engine Stop

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  #1  
Old 10-07-09, 10:51 PM
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Tecumseh Engine Stop

My son has a Sears Lawn Mower Model 917.377593... It has a Tecumseh
engine... The shear pin on the fly wheel sheared off so we replaced
it... While the fly wheel was off we noted two wires
connected to the ignition coil... One went to the spark plug and the other went
to what we think is a piece called a terminal - - part #610973 or
TC-610973... On one end of the "terminal" the wire was standing straight
up and the other end had a small diameter wire (not electrical) like a
spring clip that came in contact with a cam mechanism that operator
could engaged the brake from the handle... We wanted to under stand
how this system worked so we used a continuity tester and put one lead on
the ignition coil and the other on both ends of the "terminal" and always got
continuity whether the brake was engaged or not... We don't understand
how this design shuts the mower off.. Would you please explain how
this works ?
 
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  #2  
Old 10-08-09, 07:02 AM
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I couldn't find an image for the part you're talking about. I can only find it as a wiring terminal. Cheese or some of the other guys here can probably guide you from having worked on them.

A "dead man" switch breaks continuity to ground to run the engine. When you release the handle on the system you're describing it would ground the wire coming from the coil.
 
  #3  
Old 10-08-09, 08:44 AM
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Originally Posted by rkimberley View Post
My son has a Sears Lawn Mower Model 917.377593... It has a Tecumseh
engine... The shear pin on the fly wheel sheared off so we replaced
it... While the fly wheel was off we noted two wires
connected to the ignition coil... One went to the spark plug and the other went
to what we think is a piece called a terminal - - part #610973 or
TC-610973... On one end of the "terminal" the wire was standing straight
up and the other end had a small diameter wire (not electrical) like a
spring clip that came in contact with a cam mechanism that operator
could engaged the brake from the handle... We wanted to under stand
how this system worked so we used a continuity tester and put one lead on
the ignition coil and the other on both ends of the "terminal" and always got
continuity whether the brake was engaged or not... We don't understand
how this design shuts the mower off.. Would you please explain how
this works ?
Check continuity from the coil terminal to ground, actuate the dead man bail/engine brake. You should show continuity with the bail released and open when the bail is engaged. The "mechanism" you are likely looking for is on the linkage by the carb where the dead man bail, cable connects... follow the small wire from the coil to its other end

Small wire on a spring tab or the like....
 
  #4  
Old 10-08-09, 09:19 PM
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You can check continuity to ground just like you did, but with the green kill wire to the coil unplugged. If you check it with the coil connected, it will show ground no matter what position it's in because if it's not grounding through the kill switch, it will ground through the coil windings. (the coil windings also go to ground).
 
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