Posted by JimB2 on April 24, 2014 at 04:50:08 from (99.240.243.222):
In Reply to: B275 G P Resister posted by Bob Wyo on April 23, 2014 at 20:34:11:
Hi Bob, I would suspect that one of the glow plugs is shorted to engine block. Probably the first one closest to battery box. Make sure the glow plugs are wired in series.
Below are some posts from the archives with good info on glow plugs for B275, B414 Bradford build tractors:
The control switch sends power through the glow indicator on the dashboard-left, and then through each glow plug. Note I said "through." They are all wired in series, one on the dash and four on the engine. If any plug goes bad, nothing will work. Keep in mind that when all is hooked in series, each plug only runs on about 1 volt. So, don't try to hook 12 volts directly to any of them. Heat up time is long, usually around a minute. That's with the original style plugs, e.g. Champion CH28, Bosch 0250001001, Lucas DS104, etc.
Some people have converted to fast-heat conversion plugs that are now offered for old Mercededs 190D cars - that originally had the same slow system as your British IH.
I just pulled a new Champion CH28 out the box and checked resistance (it's the plug for a B275 or B414). 1.8 ohms. I also pulled a used Bosch off the shelf for the same tractors. 2.2 ohms. Both listed as 9/10th of a volt and 40 amps. 18 mm thread with a 13/16" hex.
They are rated .9 of a volt, not of an ohm. They sell them right here on this Website for $40, but I have no idea how correct their aftermarket part is.
Glow plugs are Champion AG28 or CH28 (155). Bosch # 0250001001 or 0250001010 Lucas: DS104 Beru: 214GK
All are rated at .9 of a volt and 40 amps, i.e. 36 watts. Ohm's Law says ohms = volts divided by amps. That should be .025 ohm (1/4) but can't say I ever checked. I never use an ohm-meter for checking glow plugs. Too many false readings.
Also such specs can be misleading, at least to me. I suspect those plugs are rated at .9 volts because of the total system resistance, not one plug. So, all five units run in series might equal that 1/4 ohm, but I'm no math wiz.
Also used in Mercedes 190D cars besides the IH tractors.
Posted by LJD on Jan 14, 2012:
The IH B414 uses the exact same glow plugs as a Mercedes 190D car. There are complete "fast heat" glow plug upgrade kits sold now for the Mercedes that direct fit the IH B-275 and B-414. No need for any adapters. Kit comes with four 12 volt plugs that get wired in parallel instead of series - and a controller. Complete kit with four fast heat plugs, new wires, relay, controller, etc. is $144. Here's the parts list:
The complete conversion kit includes the following
* Heavy Duty Manual Relay * Quality push button hole mount switch * Mercedes factory 80 amp fuse holder * 2 - 80 amp strip fuses * Correct size and length of wire needed * All terminal connectors required * 4 Upgraded Pencil type Fast Glow Plugs * Three New Glow Plug Wires * Complete step-by-step illustrated instructions
http://www.mercedessource.com/node/8320
You can by the kit without the controller for $80 - $120. Here is one on Ebay -but I'm sure you can find cheaper elsewhere . . .
And you could also just buy four plugs for $15 each and figure out the rest yourself.
If you order any Mercedes kits - make sure you verify the have the 18 mm glow plugs and not the newer smaller ones. The correct fast-heat Bosch Duratherm plug to fit your B-414 is Bosch # 0250201044. Threads are 18 mm X 1.5 - just like your originals. Work at full 12 volts and draw 20 amps each when cold and taper to 8 amps each when hot.
You can buy just the plugs at $16 each at Amazon.com and several other places.
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