Bolts - M14 1.25 pitch

trying to make a glow plug adapter, bolts can be 3 inches long or so

cannot find this 1.25 pitch in M14 size bolt or threaded rod

McM only has 1.5+2.0 pitch in M14, found nothing at Graingers either

Talk to a local machine shop. They should be able to single point the threads on a lathe. Some spark plugs had that size too...maybe cut the threaded end off and adapt to that?

Fastnel and other such places if you have one in your area should have them. Shoot a lot of stuff like that O'Reilly's has or can get easy other then maybe not as long as you may need

Try an implement dealer, auto parts stores here have good selections our Ace hardware can't be beat.

I did some looking several years back for the same thing and came up empty everywhere looking for a bolt. Here's a link to a test adapter made for the job for only $15. This is just the firt one I saw tonight, and with a little more looking you might find one even cheaper. Between the time you'll waste looking for a bolt that doesn't exist and the time it would take to home make one IF you were to find a bolt, the $15 +/- a little bit is a really cheap price in comparison.
Adapter

that one looks good, Australia kinda far from here

did search and in the USA I only found M10 adapters, will keep looking

thank you

Fastenal had many pages of M14-2.0/1.5 bolts, could find zero 1.25 pitch

BUT, they did list M14-1.25 dies, maybe I can machine a tube and thread the outside

stinking cold outside, job like this perfect for this kind of weather

thanks

If you have a motorcycle shop close you might check with them. Say a Honda shop or other such types.

It's a common spark-plug thread size and is also a common wheel bolt size.

Go down to your auto-parts store and get some wheel bolts for a 2010 Mini (the car BMW makes that likes like the old Austin Mini).

Or cut down an old 14 mm spark plug.

DORMAN Part # 610532 14 mm x 1.25 lug bolt. It's going to be grade 8 thought (or metric 12.9) and be a little work to cut, drill, and tap.

You can also buy a die for $10 and cut the threads on a SAE grade 5, 9/16" bolt shank.

I'm also wondering -depending on the brand of glow plug. Can you drill out the old 14 mm glow plugs and tap the centers for the 10 mm you want?

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those dimension specs will come in handy, thanks

still waiting on those 10mm glow plugs from amazon

in case I have to use the 8v or 1.7v plugs, I ordered 60% nichrome resistor wire and that came today, got various gauges of wire and will work my way down to proper resistance

if I burn out some plugs in the process I can try using the burned out ones as shells for the 10mm, takes care of the the sealing and removal issue

If you use the low voltage plugs in series, the IH dashboard resistor/indicator will work well enough. It's available at many tractor parts sellers. Maybe even here but I haven't looked. It would be for an IH B-275 or B-414.

They do sell the IH resistor here.

Glow Plug Resistor Indicator - For Models: B250, 275, 354, 414, 424, 434, 444, 2300, 2444. Replaces 703557R92, 706685R92. (Part No: 3042230R91)

Around $40

I have a 3414 diesel

one of the other posts indicated that the plugs on that motor were less than 1v so I didn't think that resistor would allow enuf current to lite up my 1.7v plugs

they also list glow plugs, would those fit my 23C motor??

then I would know the setup won't go up in smoke, works great on my backhoe

No, the glow plugs used in the British IH engines BD144 and BD154 (tractors 354, 374, 384, 444, B-275, B-414, BD276, BD3434, BD434, 3414,) have 18 mm X 1.5 threads. Won't fit in a 14 mm hole.

If you have a British IH that has glow plug problems, there's a changeover kit made for Mercedes 190D cars that works great. Comes with four 12 volt plugs that get wired in parallel along with a controller.

I'm not trying to tell you what to do . . . just offer some ideas. If it was my 23C, I'd make adapters and stick high voltage plugs in it - wired in parallel. The original slow-heat 14 mm plugs in the 23C are very expensive. With the IH, the slow-heat plugs are cheap so it's no big deal if one burns out now and then.

The 10 mm glow plug #s I gave you before are the correct length and as stated earlier - will work with no resistor wired in parallel as long as you are careful. Without a controller - any single-coil plug will blow if you leave it on too long. 10 seconds is usually the safe limit.

If you really want to do a nice job - make adapters to fit dual-coil plugs in because they are basically burn-out proof. I don't know of any dual-coil plugs that are as short as what your engine needs. But, if you measured properly, you could use long dual-coil plugs that the adapters would put in the correct position.

Your original plugs extend 18.5 mm beyond the threads into the engine (about 3/4"). The AC60G glow plugs now used in Chevy 6.2 diesels are 12 volts and dual-coil. 10 mm X 1 and the length is 26.5 mm. So, if you used them they'd have to be spaced away from the engine about 5/16". Nice thing is they are almost indestructible and . . . you can get at any local auto parts store.

I'm not trying to confuse you . . . just give more ideas and options. Back when I did my 23C engine - the AC60Gs weren't invented yet.

It should work. The dashboard resistor/indicator when used in the IH with matching glow-plugs is supposed to heat up at exactly the same rate as the plugs in the engine. So, when it starts glowing orange - you can assume your glow plugs are orange-hot also.

When you use that IH resistor/indicator with your OEM 23C plugs, I suspect the indicator will glow orange before your plugs are actually that hot. A slightly false reading. Just a guess; I haven't tried it. It ought to work, though. You could also just buy a fifth OEM glow-plug and stick that in the dashboard. Then you'd have a perfect match although it might look a little silly. When you've got four plugs wired in series, most of the resistance is caused by the four plugs. The indicator is just 1/5th of the circuit.

wow, lots of info to digest, thank you

tractor is sitting under cover out in the woods, temps today supposed to hit 44 degress so I plan to hike out there and pull entire glow plug setup and bring it home

using a 12 v battery, I can then watch the plug tips with various resistors and lenths of heat time, might try some Y-402-2 also

will dig in my old stuff boxes for long reach 14mm spark plugs, looks like the glow plugs seal at the front edge so the plugs will have to thread in far enuf to seal that way

using long 9/16 bolts cut down and threaded M14-1.25 also looks good, with a 12v dual tip glow plug in hand I could machine an adapter long enuf to keep the plug tip in proper position

wife says to haul all that rusty junk to scrap yard and take up golf