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684 International intake manifold heater?

R

R. Foster

New User
684 International intake manifold heater?
I came across a intake manifold heater that should fit my 684 diesel. I found reference to it on the case site under a 685 and they called it a “thermostat attachment” “glow plug”. I am trying to figure out how to hook it up. I appears that I put a tee in the return fuel line, But how should I wire it? We have a 930 case with a heater, no fuel goes to it, but it has a heavy (6 gauge wire?) going to it activated by a starter looking solenoid. Would I need a similar setup for my tractor? Also does anyone know if the fuel going to it is just heated before it goes to the pump or does it shoot fuel into the manifold?
Thanks in advance for any feedback.
 

Check the case/IH Site under UK or British built 684 tractors as the tractors for the UK usually had that feature. They used a slightly different key switch I believe where you turned it left for about 45 seconds to power the thermostart. Could just as easily power it off of a separate switch but just the parts diagram. Massey used a similar system on the UK 135, etc. I like it.
 
Hi, my brother has 454, 3230 & 684 with ether start and 495 with the heater in the intake manifold.
On the old caseih.com parts site you could find a picture of the fuel line to the heater. It appears to burn fuel in the intake manifold to heat the intake air. Turn key to ON position and then push in and hold for 30 secs or so then switch to start position. It worked pretty good. The best starter is the D-206 in the 3230, he says it starts without ether, even below 0F.
JimB
 
Make sure you use the correct type of thermostart unit!!. The IH tractors use a dry type unit, whilst Massey & others use a wet type, with reservoir!!

The ign switch has 4 positions Off - ign on - heat position ( spring loaded and needs to be held there) - heat & start.

The unit draws about 25 amps so needs connecting with a cable that will carry twice that, ideally
 

I didn't realize that the ih version was dry, just assumed that it burned fuel like the Masseys. Always something new to learn.
 
I think u misunderstand!!

It is called a dry type on the IH tractors because the heating
element glows red long before fuel is sprayed on it, which only
occurs after commencement of cranking by using fuel from the
return line

Wet thermostarts have a reservoirso that as element heats
and the ball valveopens the coil is drenched in fuel and ignites.

Fitting a "wet" unit in place of a "dry" means a short life as it
will burn out!!
 
According to the International pasts lists, the European 684, the case/IH 685, 785 along with several others had the thermostart option and they were a wet hookup. It appears that they just put a T in the overflow / excess fuel line up to the heater element.


The part book is just not clear on how to power it. I was just concerned about a key switch that it would be too many amps and burn up the switch. I was planning on using the old ether button to power it, but did not know if I should put on a starter type solenoid to power it, and just use the push ether button to power the solenoid.
Thanks for all the feed back.
 
I think I understand now. The one I got gave a I.H. number that it replaces. It came off ebay and is a tisco part. So If I hook it up the way I am thinking, I would push on the button for a little while to let it heat up then let off an start cranking. Or do I hold the button down for a little while cranking to let fuel go to the emement?
 
Thanks

Would you hook it up with a solenoid like one would an old starter? I don’t know that the puch button would handle the draw.
 
The std ignition switch handles it o/k. But your push button may be light??.

The solenoid is probably a bit heavy duty, but cetainly switching the supply through a relay has to be good!!
 
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