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Alternator conversion, tach problem

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Bob Zinck

08-27-1998 20:49:58

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I have a TO-35 gas which I cleaned up a little and use as a working tractor.
It has been converted to 12 V alternator, so the original tach which was driven of a gear box on the back of the generator, is no longer operational
Yje obvious solution is an electric tach, but most
go up to 8K RPm so mostly useless. I designed and built
a low RPM (0-3000) and it works ok, but I would like to know
if there is any ideas, apart from going back to original generator, which I don't Have
I'm sure this has been done before. any help greatly appreciated.

Rgds....Bob Z

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Sam

08-28-1998 14:06:38

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Re: Alternator conversion, tach problem in reply to Bob Zinck, 08-27-1998 20:49:58

: I have a TO-35 gas which I cleaned up a little and use as a working tractor.
: It has been converted to 12 V alternator, so the original tach which was driven of a gear : box on the back of the generator, is no longer operational
: Yje obvious solution is an electric tach, but most
: go up to 8K RPm so mostly useless. I designed and built
: a low RPM (0-3000) and it works ok, but I would like to know
: if there is any ideas, apart from going back to original generator, which I don't Have
: I'm sure this has been done before. any help greatly appreciated.

: Rgds....Bob Z

I had the same problem when I went to put a new tach on my mf65 that had been converted to an alternator. I bought a 0-4000 electronic tach from J C Whitney. Easy to hookup. If I remember 1 wire to a 12 volt source and 1 wire to the coil but it comes with complete instructions. Took 5 minutes to wire. Works on all gas engines. It is currently in the catalogue for $49.95 and I believe it is the only low rpm electronic tach that you can find. Also fits perfect in the standard 3 3/8 inch hole. Works great. Good luck.

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Gerald

08-28-1998 15:30:25

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Re: Re: Alternator conversion, tach problem in reply to Sam, 08-28-1998 14:06:38

: : I have a TO-35 gas which I cleaned up a little and use as a working tractor.
: : It has been converted to 12 V alternator, so the original tach which was driven of a gear : : box on the back of the generator, is no longer operational
: : Yje obvious solution is an electric tach, but most
: : go up to 8K RPm so mostly useless. I designed and built
: : a low RPM (0-3000) and it works ok, but I would like to know
: : if there is any ideas, apart from going back to original generator, which I don't Have
: : I'm sure this has been done before. any help greatly appreciated.

: : Rgds....Bob Z

: I had the same problem when I went to put a new tach on my mf65 that had been converted to an alternator. I bought a 0-4000 electronic tach from J C Whitney. Easy to hookup. If I remember 1 wire to a 12 volt source and 1 wire to the coil but it comes with complete instructions. Took 5 minutes to wire. Works on all gas engines. It is currently in the catalogue for $49.95 and I believe it is the only low rpm electronic tach that you can find. Also fits perfect in the standard 3 3/8 inch hole. Works great. Good luck.

That's probably the one I was thinking of.

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Gerald

08-28-1998 09:11:16

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Re: Alternator conversion, tach problem in reply to Bob Zinck, 08-27-1998 20:49:58

: Rgds....Bob Z

The closest I've found is to go to a digital electronic tach then with 10 rpm resolution it has enough to be useful at tractor engine speeds. Otherwise going to a meter type electronic tach that worked off the points, set it for 2 cylinders instead of 4 and then remark the scale to read 0-4000 rpm. Electrically I prefer the charging of the alternator, but my MF-135 is more useful with a working tach so I won't change soon.

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