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Dating At Wisconsin S-7d On A Bush Hog D4-7


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#1 Jack OFFLINE  

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Posted March 29, 2013 - 08:47 PM

So I started tinkering with the old Bush Hog I bought a few weeks ago.  It seems it has no spark. The first thing I thought I would do is figure out just what I am working with.  Now I am professional automotive mechanic by trade so its not like I am totally clueless.  But I have never fooled around with an old Wisconsin air cooled engine before.  So I hit the old internet and I did find most of the info I will need diag its issues.  But what I did not find was the relation of the engines numbers to production dates.  The engine ID tag was in very poor shape and I had to remove it and polish it up just to read it.  I am hoping one of our fine members can help me date this old hunk of iron and explain just what these numbers mean.  Here is what I got.

 

  S-7D   3909176    3 X 2 5/8   221127  Thanks in advance for any help you guys can offer.  Jack..



#2 olcowhand ONLINE  

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Posted March 29, 2013 - 08:54 PM

Serial Number Found!
Produced Year: 1965
Produced Month: January


 

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#3 bread320i OFFLINE  

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Posted March 29, 2013 - 08:55 PM

These engine are common to have bad coils and replacments are not available. If cleaning points and replacing the condensor does not work, consider converting it to battery ignition.


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#4 olcowhand ONLINE  

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Posted March 29, 2013 - 08:55 PM

Here's where you can look them up in case you need to date another Wisconsin:  http://www.wisconsin..._serial_search/


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#5 Jack OFFLINE  

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Posted March 29, 2013 - 09:11 PM

You guys are awesome.  Just what I needed and quick too !  Thanks a lot.  Whats involved in making the ignition conversion?



#6 bread320i OFFLINE  

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Posted March 29, 2013 - 09:37 PM

Get a 12 volt automotive style coil and some wire. Some where onlie I found a link that easly shows how to convert to battery iginition.

 

Looking...


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#7 bread320i OFFLINE  

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Posted March 29, 2013 - 09:42 PM

I know there is alot of info on this page gut there is alot of good info here.

Shows a simple wiring diagram for typical battrery ignition

 

http://gardentractor...om/ignition.htm

 

ign1ani.gif


Edited by bread320i, March 29, 2013 - 09:46 PM.

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#8 bread320i OFFLINE  

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Posted March 29, 2013 - 09:44 PM

Look above


Edited by bread320i, March 29, 2013 - 09:47 PM.

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#9 Jack OFFLINE  

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Posted March 29, 2013 - 10:23 PM

Thanks.  I got thinking about it.  The points are there so it couldn't get much more simple than that.



#10 bread320i OFFLINE  

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Posted March 30, 2013 - 06:30 AM

These Wisconsin Engines are simple to work on. I worked on a few in my early Bolens.

Some advice with setting the timing on these engines, dont gap the points at .020

Get a multi or volt meter and static time the points with the flywheel and timing marks.

Once done properly and good carburation these engines will sing a song.

 

The carburetors on these motors can be trouble some too. From the factory they installed very thick gaskets between the carb and engine and over time the carbs would warp due to over tightening. Make sure all gasket surfaces are flat.


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#11 Titus ONLINE  

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Posted March 31, 2013 - 10:10 AM

I remember my S7-D, and my 1st bush hog which is now in pieces. I could NOT get spark to that, but since at the time I was new to engines and GTs in general, I had 0 idea about the points. I put an insulated flat head in there and spark happened ;) Ran within an hours after that. What a great moment!

 

Then the gov spring gave out and the engine went.


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#12 sacsr OFFLINE  

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Posted March 31, 2013 - 10:48 AM

These Wisconsin Engines are simple to work on. I worked on a few in my early Bolens.
Some advice with setting the timing on these engines, dont gap the points at .020
Get a multi or volt meter and static time the points with the flywheel and timing marks.
Once done properly and good carburation these engines will sing a song.

The carburetors on these motors can be trouble some too. From the factory they installed very thick gaskets between the carb and engine and over time the carbs would warp due to over tightening. Make sure all gasket surfaces are flat.

How do I use the multimeter to do this? Thanks

#13 bread320i OFFLINE  

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Posted March 31, 2013 - 12:14 PM

The procedure is called Static timing it is explained in the manual

http://gardentractor...-engine-manual/

Sorry it is not the exact model enging you are working on, but process is the same. What you are doing is setting the points in relation to piston position.  You want the spark to occure at just the right time (just before TDC I believe) And the timing marks on the flywheel will tell you exactually where that "correct" spot is. 

Static Timing is much more accurate expecially now because after many years of opperation an engine will wear and tolerance's change. 

 

BTW this procedure will also work on Kohler engines too. I have yet to do this to a briggs because there are no timing marks on the flywheel.


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#14 sacsr OFFLINE  

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Posted March 31, 2013 - 12:27 PM

What do you set the multimeter to in order to know when you hit the "sweet spot"?



#15 olcowhand ONLINE  

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Posted March 31, 2013 - 01:05 PM

What do you set the multimeter to in order to know when you hit the "sweet spot"?

 

 

When the points break continuity on the meter as you slowly turn the flywheel, stop right there to see exactly where the timing marks align or don't.  If the flywheel mark is ahead of the static timing mark in the shrouding, then you close the points gap.  If after the timing mark, then close the gap.  Adjust till the timing marks align perfectly when the points break.


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