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Farmall & IHC Tractors Discussion Forum
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D236 Glow plugs

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larry M

11-06-2004 22:24:18




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What would cause my 606 glow plug button to burn up? I fried a couple and finally put a real heavy one in, but the wire that feeds the glowplugs still gets warm and I don't think it should. As far as I can tell, its wired the same as my 656, and I've never had this problem with that tractor.




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karl f

11-07-2004 17:59:52




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 Re: D236 Glow plugs in reply to larry M, 11-06-2004 22:24:18  
another thought. in the 656 schematic it looks like the glow plug circuit is doubled up/ paralleled. there appears to be 2 wires carrying the load...maybe one of your wires is bad or someone replaced the wiring with a single lead. for a load like that, i wouldnt hesitate to go with 2 10 gauge wires to carry it. lord knows the tractors' wiring was marginal at best when new. -karl



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Allan in NE

11-07-2004 05:34:06




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 Re: D236 Glow plugs in reply to larry M, 11-06-2004 22:24:18  
Mornin' Larry,

Don't know anything about your tractor and this is a knee-jerk reaction, but you didn't happen to just replace the glow plugs lately too did you?

With a set of newer 6 volt plugs, maybe? The 6 volt plugs need a 'pulser' or 'controller' to turn them on and off and are identified by the wider connector spade.

Otherwise, the feed wire will normally run a little warm; shouldn't be so hot you can't touch it tho.

Dunno, like I say, I don't know your tractor, but just tryin' to help,

Allan

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Chris Brown

11-07-2004 05:27:50




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 Re: D236 Glow plugs in reply to larry M, 11-06-2004 22:24:18  
Could possibly one glow plug be shorted out internally? Unplug all the plugs and plug them in one at a time and see if one draws alot of current.Same process for testing them.



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Allan in NE

11-07-2004 05:53:30




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 Re: D236 Glow plugs in reply to Chris Brown, 11-07-2004 05:27:50  
Hi Chris,

Not to start an arguement, but glow plugs have to be shorted to work properly and this is the key to their operation.

They are nothing more than a dead short, controlled by being routed thru that carbon filled tip.

I know what you are trying to say tho, but I wonder if you wouldn't have to "pull 'em" to see one that is defective in this 'burnt away' condition.

Have a good one,

Allan

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Chris Brown

11-07-2004 08:35:20




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 Re: D236 Glow plugs in reply to Allan in NE, 11-07-2004 05:53:30  
On my 560 the glow plugs draw alot of current but nothing like a dead short,I'm no electronics expert but theres a resistance factor there somewhere. If it were a dead short into the glow plug it would simply burn the wire right off it the first time power was applied. Normally when a glow plug goes bad it burns out to an open circuit. I suggested that maybe/possibly one had burned out and caused a short circuit,although very unlikely. It is a whole lot easier to explain something in person than typing it out.

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Allan in NE

11-07-2004 09:28:00




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 Re: D236 Glow plugs in reply to Chris Brown, 11-07-2004 08:35:20  
Hi Chris,

Yes, I knew what you meant and you're right; they have a small amount of resistance (kinda like a carbon filled plug wire) and they usually fail "open".

That's the trouble with these darned computers anyway....can't see the "emotion" of the sentence. :>)

Allan



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old don

11-07-2004 16:10:37




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 Re: D236 Glow plugs in reply to Allan in NE, 11-07-2004 09:28:00  
I don't know that much about glow plugs but electricity is after all electricity using Ohm's law if you have a multimeter with DC amp capability you can hook it it up inline better known as series connection and make sure you have it in the right range and operate it as normal and see what your amp reading is and then determine if your wire is heavy enough to handle the load and as someone said in an earlier post those glow plugs should have a resistance value in a spec book somewhere. Basically if you know what the resistance is of one then multiply that by six or whatever total amount in a series and with a known voltage ie; 6 or 12 by using Ohms law can determine the amp reading. My opinion is if you have a glow plug that has a high resistance it could cause problems. A multimeter set on Ohms could find the problem if you unhook each one and take a reading on each one writing them down and if one is higher than anyother by more than 10% it could have a problem.

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