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Farmall & IHC Tractors Discussion Forum
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SH Advance springs

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Gauger

10-23-2006 18:11:47




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I have three IH distributors on the bench. All three came out of Super H's. Two '53's and one '54 but I don' know which came out of what tractor. The spark advance weight springs in one of the units are noticeably heavier than those in the other two. The parts book only identifies one spring selection, 358108R91, and there is no way for me to tell if the heavy or light spring is that part number. The heavy spring has 5 coils of thick wire, the light spring has 7 coils of thinner wire. Any ideas?? What about performance??

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D Slater

10-23-2006 19:09:12




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 Re: SH Advance springs in reply to Gauger, 10-23-2006 18:11:47  
I was never able to tell those springs apart 100% acurate after there out of package. Some I have a good idea when looking at them. Coils on 358108 R91 are not to heavy though. IH made power improvment and firecrater kits with different springs in kit to put in distributors also. May be why you have different types. Distributors get switched from different tractors than original also. If you look at round base of dist. were 2 clamps hold it there will be some letters and numbers stamped on it. First letter is dist code. Think yours should have a J on them for SH. Look at the rotor that weights go on. If its a J code dist. this if original will have L 30 stamped in it. Some if not all SH firecrator kits changed this to a L22 though for less total advance.Other # rotors or dist. end up in tractors after years gone by. Some common rotor # are 25 and 40 besides above #. The hole in rotor that cam fits in limits max advance. Sometimes this hole is worn a good bit and giving dist. more total advance. last I checked couldn't get to many different springs from IH. Could get 358108 R91 last I tried.

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D Slater

10-23-2006 19:25:36




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 Re: SH Advance springs in reply to D Slater, 10-23-2006 19:09:12  
Thought I would add this tip. When putting condenser and point contact back in, make sure to use original screws or same length. If to long they will hit weight cage when dist. turns and bend it all up in woarse case. Found more trouble with advance parts for this reason than any other. Let me know what you find on dist.



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Janicholson

10-23-2006 19:04:52




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 Re: SH Advance springs in reply to Gauger, 10-23-2006 18:11:47  
Curving a distributor for a tractor is possible. A combination of springs may be the ticket. Both heavy springs may keep it from full advance. Both light springs may allow full advance too soon. Modern fuels may stand more advance quicker than the old fuels of the fifties. A timing light, and a tach could be used to check the real situation. JimN



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curious

10-23-2006 18:56:11




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 Re: SH Advance springs in reply to Gauger, 10-23-2006 18:11:47  
I took the heavies springs and put it in the Distributor in my B Farmall and it help the lugging alot.



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Hayfarmer

10-23-2006 18:20:46




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 Re: SH Advance springs in reply to Gauger, 10-23-2006 18:11:47  
I asked a question about getting a little more horsepower out of my SMTA on the pulling forum. Chad S recommended getting one of the chevy truck recurve kits and using the lightest spring in the set to let the distributor advance quicker. I did that and it seems to work well. I think I would go with the lighter springs.



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