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SSI unit questions


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#1 rustyoldjunk OFFLINE  

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Posted December 31, 2014 - 06:33 PM

I know they can be replaced with original or other setups. What I wondering is who has ever pulled the flywheel off clean and checked the unit out and had any luck getting spark ? I have cleaned the coil and flywheel on a lot of Briggs and gotten spark I just don't know if it is a possibility with the SSI unit on my '68 HH120. I have intermittent spark,sometimes strong blue,sometimes weak,and sometimes no spark.



#2 classic ONLINE  

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Posted December 31, 2014 - 07:44 PM

When mine acted like that it was toast. The insulation on one of the wires wore through on the block while I was using it and I didn't know it until it started acting up. I repaired the wire, but it still only produced weak intermittent spark. I replaced the SSI with a spare I had and all is well now. Try cleaning everything good and replace the plug wire end where it attatches to the spark plug. Also, try another plug if you haven't already. The plug wire end turned out to be the problem on one of my SSI units and man I was relieved after replacing it and getting strong spark.
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#3 DougT ONLINE  

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Posted December 31, 2014 - 09:21 PM

Make sure you are making good contact where it mounts to the block.


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#4 superaben OFFLINE  

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Posted December 31, 2014 - 09:32 PM

Make sure you are making good contact where it mounts to the block.

 

That's a big one right there.  Sometimes that's all it takes. 

 

Ben W.


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#5 MH81 ONLINE  

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Posted December 31, 2014 - 10:04 PM

Also, regap to the taller pin.
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#6 robert_p43 OFFLINE  

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Posted January 01, 2015 - 09:34 AM

Good to hear that it isn't always shot if not working quite right.


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#7 MH81 ONLINE  

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Posted January 01, 2015 - 10:26 AM

Oh, I forgot. You might take the flywheel off and clean the magnets/pickups in there. The charging for the CDI is done under there.
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#8 TAHOE ONLINE  

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Posted January 01, 2015 - 11:26 AM

I had two on my 16, tractor ran great until it got hot, then shut down, both has same symptoms. Leave it sit for 10 mins, would fire right back up. Once though  the module finally died, it was dead. 

I agree, make sure you have good ground between module and block, all wires are in good shape. Also, the plug wire is just pushed down into top of module over a pin that sticks out. I've heard some guys pull it out, clean up the end, then push it back down in and slap  some RTV around top to hold it in. I've never had that luck, mine all just have died with no return. 

Pull, clean contacts, re-gap tall pin to .006-.010, check all wiring, maybe pull flywheel, check wiring and magnets and then hope for the best. 


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#9 rustyoldjunk OFFLINE  

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Posted January 01, 2015 - 11:49 PM

I pulled the flywheel off and it looks to me like I am not the first one to mess with this SSI. It looks like something is rubbing the black module (?). It is definitely greasy and the plug on wire to the module is not a tight fit at and looks to have been seriously bent over. What pins am I looking for ? I don't see any "pins. Here is a few pictures.

Attached Thumbnails

  • 68 sears super 12 HH120 SSI.jpg
  • 68 sears super 12 HH120 SSI.jpg 4.jpg
  • 68 sears super 12 HH120 SSI.jpg 5.jpg
  • 68 sears super 12 HH120 SSI.jpg 6.jpg
  • 68 sears super 12 HH120 SSI.jpg 8.jpg
  • 68 sears super 12 HH120 SSI.jpg 11.jpg
  • 68 sears super 12 HH120 SSI.jpg 12.jpg
  • 68 sears super 12 HH120 SSI.jpg 13.jpg


#10 KennyP ONLINE  

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Posted January 02, 2015 - 06:21 AM

I would say the magnet in the flywheel is rubbing it.


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#11 TAHOE ONLINE  

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Posted January 02, 2015 - 09:21 AM

Ahhh, you got the first gen SSI, most likely won't be flywheel pins to set gap, that system is slightly different the the later models. Not sure the gap between flywheel. 


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#12 rustyoldjunk OFFLINE  

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Posted January 02, 2015 - 01:30 PM

Ahhh, you got the first gen SSI, most likely won't be flywheel pins to set gap, that system is slightly different the the later models. Not sure the gap between flywheel. 

How in the world do you figure out how much gap you have on this behind the flywheel setup ?


Edited by rustyoldjunk, January 02, 2015 - 01:41 PM.


#13 MH81 ONLINE  

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Posted January 02, 2015 - 05:51 PM

I think I have that info at home. I will post it later if I do.
First things first, however... What slop on the crank? I would almost bet there is some up/down movement on that.
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#14 drbish ONLINE  

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Posted January 02, 2015 - 06:03 PM

I believe this is what you are looking for,page 47

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


Edited by drbish, January 02, 2015 - 06:03 PM.

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#15 MH81 ONLINE  

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Posted January 02, 2015 - 09:46 PM

They don't mention they have any way to adjust gap. Only timing.
Any slop you can muster, move it away from the magnets and turn the assembly ccw to the stop.image.jpg image.jpg
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