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Farmall & IHC Tractors Discussion Forum
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B414 glow plug voltage

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Geoff

09-27-2003 05:53:20




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My B414wiring needs work and the glow plug indicator thingee has crapped out. I would like to put a resistor in-line to reduce the voltage as the replacement plugs I was sold seem to have 9v stamped on them. What is the actual voltage at the glow plug. I know from painful experience that 12 v is TOO much.




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Gary-Miss

09-28-2003 16:22:34




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 Re: B414 glow plug voltage in reply to Geoff , 09-27-2003 05:53:20  
I went to the shop to take a look at a spare B-=414 head. It would appear that you couldremove the glow plug and the injector, have a shop vac running and "doodle" the carbon out without it getting into the cylinder. It would only be necessary to do this on any cylinders that were giving a problem.



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Geoff

09-29-2003 06:48:35




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 Re: Re: B414 glow plug voltage in reply to Gary-Miss, 09-28-2003 16:22:34  
Hi Gary

Thanks for all the help. I'll get going on this with my "mechanic" friend this week. The tractor otherwise runs well when you get it started so it's still possible for me to use it...but cold weather is coming.

Geoff



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JB

09-27-2003 16:25:09




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 Re: B414 glow plug voltage in reply to Geoff , 09-27-2003 05:53:20  
Hi, the key switch with the push and hold for glow plugs is probably from 434D. As I recall, B275/414D had a L handle switch on the dash that you held down until glow plug indicator glowed.
On our B414D the glow plug indicator burnt out and since it was in series with the glow plugs the whole circuit didn't work anymore. I just bypassed the glow plug indicator by connecting the 2 wires to the one terminal.
When we went to start the B414D when it was cold, we would just count 1000, 1001, 1002 .... 1010.
In the summer time about 10 secs would be enough to start it and in the winter it would take 30 sec.
BE CAREFUL NOT TO HOLD SWITCH ON TO LONG AS IT WILL BURN OUT THE GLOW PLUGS.
Experiment with your B414D and you will find out how many seconds to hold the switch for different temperature.

Since glow plugs are in series the + side of the glow plug closest to the battery should read 12v, the next 9v, the next 6v, the last 3v.

Good luck
JB

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Gary-Miss

09-27-2003 14:26:24




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 Re: B414 glow plug voltage in reply to Geoff , 09-27-2003 05:53:20  
Your mechanic is correct. It does deliver 12 Volts to the rear glow plug (the first in the series), but, since they are wired in series, only the last one (the front) is hooked directly to ground, therefore, none of them get the full twelve volts. I hope an electrical engineer or such will explain the difference between series and parallel as it applies to resistors which is really what glow plugs are. I left the indicator in the circuit. It is important to do this since it is also in series and would raise the individual voltages and cause premature burnout. I didn't have to clean the precombustion chambers on mine, but I did on a 424 several years ago. We already had the head off so it was no problem. I'vegot an extra head in the shop. If you will Email me Monday to remind me (dorisholtman@aol.com) I will be glad to check the glow plug deal out for you and the pre combustion chambers. Good luck.

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Gary-Miss

09-27-2003 07:21:02




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 Re: B414 glow plug voltage in reply to Geoff , 09-27-2003 05:53:20  
The B-414 glowplugs are in series, only the front one is grounded. You don't need a resistor. I did away with the original glow plug switch on mine and installed a foot starter switch in the same place. Most of the time, when you start having glow plug burnout problems on the B-414 as well as its sister tractors, such as the 424, the precombustion chamber is full of carbon and needs to be cleaned. This stoppage will also cause excessive smoke.

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Geoff

09-27-2003 10:55:18




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 Re: Re: B414 glow plug voltage in reply to Gary-Miss, 09-27-2003 07:21:02  
Hi Gary
thanks for the speedy reply.
Did you get rid of the glow plug indicator unit as well as installing a foot switch for the preheater? I was sold a new keyed ignition switch with acc and preheat settings as well as start (and off). The wiring seems OK but it is now delivering 12V to the rear plug and my mechanic thinks that's too much given the "look" of the replacement plugs loop.
BTW what product do you use for cleaning the precombustion chamber? That sounds like a great idea.

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