OH160 final install, SSI conversion to battery coil, STF style. - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 88 Old 11-02-2012, 10:46 AM Thread Starter
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Thumbs up OH160 final install, SSI conversion to battery coil, STF style.

Ok, for those you didn't follow other thread, read this link below on how Jon
(searstractor fan- "STF") developed a replacement ignition on the Tecumseh motors for the failed SSI module using a pickup and coil that is used on pulling tractors. Jon adapted this system to the Tec motor, he needed a real world test mule, I had a 1977 16/6, OH160 with bad SSI unit, we only live 45-50 mins apart, perfect match. I used tractor for several hours under varying degrees of load, mainly grass cutting and performed very well so I bought my parts, this documents final install and parts list/costs.
This tractor actually runs smoother, maybe little cooler, and seems to be quieter and no longer has as much what I would call valve noise. I am very happy with the setup.

I take no credit for this system other than documentation and pics of final installation on my tractor.

https://www.mytractorforum.com/showthread.php?t=251065


After testing this system, I have only found too drawbacks.
1. Since it converts to battery ignition, you must have good working charging system to keep it running. There are many other tractors that are the same, so guess not really bad point. Any other conversion out there also runs off battery so really no choice.
2. You must remove pins from flywheel and glue in a magent. It will most likely require you to drill out hole so that will ruin flywheel if you ever want to go back. Since this is an upgrade and I will never go back, not really a bad point either.

This is a thread on Jon's conversion, but I want to mention there are also other conversions out there. Best thing I like about using Jons', it eliminates the control module that the other conversion out there must use. Just a trigger and coil. With that said, I will be trying to convert my old SSI module to use as trigger and use Ed's setup on the ST16 I am restoring just to see if I can.
Ed Stoller at earthandmagnets.com, Dale Colvert at overnightsolutions.com, and Brain Miller at gardentractorpullingtips.com.

The following is a list of parts and "my" costs to get them to me. Jon was able to do this cheaper as they see the parts dealers at the pulls they go to so he doesn't pay shipping. It was just as cheap for me to go ahead and order as to have Jon get them and then pay gas and the time to run up to his house.


1. Single cyl flywheel pickup trigger
This comes from Midwest Super Cub and primarily used on Kohlers. I emailed them, asked for trigger only with out magnetic ring or bracket. Total was
$69.xx, make sure you ask for USPS flat rate mine was $6.25, UPS is $15 for shipping.
http://www.mcssl.com/store/midwestsu...gger-ignition-

2. Bosch Blue coil
Jon recommended going through Nichols performance. You have to make sure you get a 3ohm coil, they had best price even with shipping and Ohio tax.
I paid $47.xx to the door.
http://www.nicholsperformance.net/engines.htm

I did find a no name brand coil that is supposed to be same as the Bosch, I can't recommend, use at your own risk.
http://www.international-auto.com/in...325535&noapp=1

3. Spark plug wire
Jon was using performance MSD auto wire and adapter on his coil, I happen to have an old set from a points car so I used that so no $$$ in this one.
Nichols lists wires on above link. I think Super Cub and also Brian Miller sell them. Maybe able to get just coil wires at local auto parts store also.

4. Off/on toggle switch
Pretty self explanatory. I got a 20 amp switch from Tractor supply for $3.99.

5. Trigger bracket
Jon spent some time making this little bracket to get timing set to about 30* while running. I will be sending his back to him and I made a copy so if needed, either of us would probably send you one. No $$$$

6. Various connectors, wire, nuts/bolts
Depends on what you have. We both had most of spade/butt connectors/wire.
I did have to buy 2, 4-40 machine bolts and lock nuts from Menards, These cost about $1.29 or so total. These are super small bolts needed to hold trigger on brackets. Anything much bigger and they won't fit, super small.
I also used heat shrink on connections and installed fuse in line before switch, both I already had.

7. Magnet for Flywheel
Jon said he used the magnet from on old magnet screwdriver tip? I found some on the web and as of this writing will be ordering a couple. I am using Jon's flywheel so I need to convert one of mine. The original pin holes are about 3/16" so I am ordering these and maybe one 1/4" just in case. Jon drilled out hole, mounted magnet using JB Weld. It is important to make sure magent is oriented properly to trigger switch...Jon can answer that one
https://www.amazingmagnets.com/show-decimal-d125a2.aspx


Pics in next post.

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Last edited by TAHOE99; 11-02-2012 at 10:56 AM.
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post #2 of 88 Old 11-02-2012, 10:55 AM Thread Starter
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Here is the trigger with it mounted in original SSI spot, pretty self explanatory. You can see the magnet glued into the advanced pin hole on flywheel.





My switch set up w/inline fuse that I mounted in the hole where the switch goes for the rear actuator. Mine not being used, I just utilized that hole for now. You can drill hole in dash where ever you want it mounted.




Our test setup with Jon's parts, bunch of wires hanging everwhere using wire nuts.




Here is mounted coil with trigger wiring. The black goes to negative on coil. The red goes to positive alone with the power from switch. You can conncet however, I just put both the trigger wire and power wire both in spade connector to coil




My final setup. Still not as clean as I would like as rest of tractor wiring is a mess which will all be redone someday. My plug wire was a little long so I wrapped in loom, then put a couple coils in it to keep it off motor.




Here is a pic of Jon's parts I took off in a pile, not much to this. Basically trigger, coil and switch. See how small those little screws are


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post #3 of 88 Old 11-03-2012, 09:23 AM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Question: is the toggle switch really necessary? Could not one use a key-switch set up for a battery ignition (i.e. early Tec, Briggs, Onan) that will supply 12v to the coil when in the ON position but cut the power when switched off? Just seems like it would simplify things and make for a cleaner, more factory like install.

Thanks,
Joe
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post #4 of 88 Old 11-03-2012, 09:43 AM Thread Starter
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Don't see why it wouldn't. For me, the $4 toggle switch was cheaper than replacing ignition switch. It is necessary on mine since the SSI ignition switches are set up different internally than the battery coil switches. A switch out of an older points type or a SS twin tractor would probably work fine. I actually have one, may have to try down the road.

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post #5 of 88 Old 11-03-2012, 11:39 AM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Looks (almost) factory!! Nice work guys

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post #6 of 88 Old 11-03-2012, 01:42 PM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Glad to see it still works tahoe!!! Im gonna make another flywheel and use 2 magnets and fire it like the stock setup..I think theirs something to that second pin....You can use an ignition like an SS16 uses to power this setup just fine, only problem ive seen is when its cold, this system has the timing advanced out to the full 30 degrees, and the stock setup is backed up prolly 5 or 10 degress with the other pin, so that retards it and helps with starting...Otherwise it fires up great, just has some kick back sometimes...thats why if you use a toggle switch you can get it spinning and then throw fire to the coil system...which works fine, since some of our engines on the pullers have timing from 24-36 degrees advance...ive even played with low 40's for timing on a kohler....Brackets arent hard to make...I drilled the 2 big holes and mounted it to the motor, layed the module on flywheel, and scratched the holes for it on the plate, drilled them big, mounted module and adjusted everything up till it cleared..took me like 10 minutes....My setup was ugly do to me not caring what the first test subject looked like...SHoulda cleaned it up when I installed on Tahoes tractor but I was to excited to care lol...

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post #7 of 88 Old 11-03-2012, 01:42 PM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Tahoe, if you need help drilling that flywheel or anything give me a call, I might be able to run down!

1967 Sears Suburban 10, 1967 Custom 7, 1969 8Xl, (3) 1973 ST/16, (2)1973 SS/16, 1973 ST/10, 1974 SS/16, 1974 ST/16, 1976 ST12, 1977 SS/18, 1977 10/6, 1977 12/6, 1977 14/6, 1978 GT19.9. 1973-75(unknown year) Roper RT16T, 1978 or 79 Roper 18T. Craftsman Mowers: 196? Craftsman 6hp mower, 2 196? craftsman mowers. Various 82 series pullers 1973 IH Cub Low Boy, Cub Cadet 782, IH Cub Cadet 582 Special, IH Cub Cadet 582. 1972 Economy Jim Dandy, 1972 Economy. And an unknown Panzer, theirs more im sure.
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post #8 of 88 Old 11-03-2012, 07:40 PM Thread Starter
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Ok. You want me to get you a few of those magnets I'm gonna order?
I've started both ways, toggle on and toggle off then flip it, not had any kick back either was so far.
You still had to be somewhat accurate on bracket to get timing close, would've been easy to get it out of time by drilling holes in wrong place

I need to ask you a question about something else sometime too. Maybe put a little $$ in your pocket if you still have and wanna sell.

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post #9 of 88 Old 11-03-2012, 07:42 PM Thread Starter
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Thanks Hugh. I plan on cleaning it up more down the road as my son wants to do restore project on this tractor for 4H.

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post #10 of 88 Old 11-03-2012, 10:48 PM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

4H is the best! What was the total cost of the setup?

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post #11 of 88 Old 11-04-2012, 09:05 AM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

How would you put this on HH100 using a starter generator??

John Deere 110,112,210, and 214 with 48" decks, # 31 tiller, 48" blade, 37A snowblower with full parts 110 also Sears Suburban 12 with 48" deck, 36" snowblower and sickle bar mower which I sold
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post #12 of 88 Old 11-04-2012, 02:28 PM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Mounts the same way...the 2 bolts that the module is mounted to are common on all engines, but you dont have the dowel pins, so you'd have to either degree the flywheel, or buy a used ring gear flywheel, and take off the ring gear....ill have to find an old generator flywheel, and see if theirs a common point I can use...ive got a degree wheel so I can find where to mark it...Tahoe, I have texting on my phone now, so you can text me if you want, or call me sometime...

1967 Sears Suburban 10, 1967 Custom 7, 1969 8Xl, (3) 1973 ST/16, (2)1973 SS/16, 1973 ST/10, 1974 SS/16, 1974 ST/16, 1976 ST12, 1977 SS/18, 1977 10/6, 1977 12/6, 1977 14/6, 1978 GT19.9. 1973-75(unknown year) Roper RT16T, 1978 or 79 Roper 18T. Craftsman Mowers: 196? Craftsman 6hp mower, 2 196? craftsman mowers. Various 82 series pullers 1973 IH Cub Low Boy, Cub Cadet 782, IH Cub Cadet 582 Special, IH Cub Cadet 582. 1972 Economy Jim Dandy, 1972 Economy. And an unknown Panzer, theirs more im sure.
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post #13 of 88 Old 11-04-2012, 05:52 PM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Ok thanks

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post #14 of 88 Old 11-05-2012, 10:31 AM Thread Starter
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Quote:
Originally Posted by Hugh-SS/16 View Post
4H is the best! What was the total cost of the setup?
Yeah, my kids have been in 4H since they were little, started as cloverbuds. My son got a 10 yr award last year, he still has 3-4 yrs to go until he is 18.
We mainly do livestock/small animals, but they also do extra projects from cake decorating, special interest, ecology, and son wants to engine/tractor restoration in his final years. Too bad we do not have a pulling project.


Approximate costs

Trigger $70 shipped
Bosch coil from Nichols $45-50 shipped
plug wire $15
toggle switch $4-5
Magnets $1
various connectors/wiring if do not have $10-15
various bolts $2-3

So total if you had to buy everything outright
$150-160

This is in line as the other kits out there that use the flywheel pins, coil, and a Chrysler control box are all $140-160

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post #15 of 88 Old 11-05-2012, 10:37 AM
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Re: OH160 final install, SSI conversion to battery coil, STF style.

Quote:
Originally Posted by TAHOE99 View Post
Yeah, my kids have been in 4H since they were little, started as cloverbuds. My son got a 10 yr award last year, he still has 3-4 yrs to go until he is 18.
We mainly do livestock/small animals, but they also do extra projects from cake decorating, special interest, ecology, and son wants to engine/tractor restoration in his final years. Too bad we do not have a pulling project.


Approximate costs

Trigger $70 shipped
Bosch coil from Nichols $45-50 shipped
plug wire $15
toggle switch $4-5
Magnets $1
various connectors/wiring if do not have $10-15
various bolts $2-3

So total if you had to buy everything outright
$150-160

This is in line as the other kits out there that use the flywheel pins, coil, and a Chrysler control box are all $140-160
Price is about in line with a used SSi that has no warranty-

The real fix is to install pedals like Jon's project tractor- way cheaper, and never breaks

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