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electric tach

K

kenny kabat

Member
About 2 years ago I put an engine out of a Gleaner M combine in my 190xt. With the newer engine, I no longer had the cam driven tach. I've been brainstorming how to remedy this. Alas, I have solved it. On the Delco altenator you can add a wire from the diode trio for an electric tach. I had the tach from the donor combine, just had to add the wire out of the alt and hook it to the tach. To calibrate it, I used a handheld mechanical tach on the PTO of another tractor with a working tach. At 1000 engine rpm I checked the PTO, then went to the Allis and revved the engine until the PTO speed matched. After the I calibrated the tach to read 1000. Probably not perfect, but it will be close enough for me.
 
On the back of the tach there is only 3 studs, 1 for pos, 1 for ground, and 1 for signal. There is a screw inside a rubber plug to set the needle. The combine had a switch before the tach for engine, clyinder, fan, and one other. Its from a 1975 so electronics were limited to say the least.
 
This one had the tach drive midway on the block. I bought the tractor with the engine in pieces. In fact, I had to track down some of engine parts. The alternator was off the combine. Next project will be the air conditioning system
 
That sounds like what would have been the spot where a distributor would have been on a gas engine? This fascinates me, because I've never seen it. A gas 190 would have had a distributor in that hole, and the same mechanical tach drive as the diesel. I'm wondering if your first engine was out of a power unit, or some such application?

How about the oil cooler manifold? Some of those were very different on the combines, compared to the tractors? I never found out why.

Somewhere along the way, they changed the oil pump, from a center mounted/combination distributor drive, with the oil pan deep in the middle, to an oil pump driven off the front gears, with a different oil pan/oil pick up.
 
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