GC 1705 glow plugs

[atsah]

Does anyone know the part number for my glow plugs, all three of them test bad.
I was wondering if the plugs for the GC2300 series are the same.

Thanks in advance.

 

[WranglerX]

Use "Guest User" login..

AGCO Parts Books

Next enter ... GC1705- Massey Furgeson

Next go to ..Engine, Fuel & Electrical in left hand column..

Next scroll down to Electrical Parts and click on it...

Look at item #3 on graphic.... Check part number reference in right hand column...

6259745M2 GLOW PLUG

Think it will get you there IF I didn't goober up a step...

Might try same search path from parts book for 2300 to see if you get part number match...

Many tractors use the Iseki engine, might find cross reference some place...

Hard to believe all three are bad...

Just for giggles....

Glow Plugs : Diesel Tractor Parts!, Parts Super Store

Dale

 

[atsah]

Thanks..

They have been getting more useless as of late so I decided to check power to them, power is good so I pulled them all out and ohmed them out, no connection to the elements at all, ohms were very high.
The glow plug system is stupid on these tractors, holding the plugs on in winter for 20-30 seconds in winter is going wreck them in short order. It痴 80f here and it takes a while to start it, all three are junk.

Just installed a new Interstate battery MT-51, 500cca, fit perfectly and cranks it fast.

 

[Dave M7040]

It is rare for a glow plug to fail. It is far more common for someone to have mis wired them. Some are series wired and others parallel and most don't understand the difference.

If the new ones clearly work better then great.

Dont't confuse the heating time of older GP's with that or modern ones. You cannot overheat the old ones as the resitance increases with temp and the current drops so it is a self limiting situation.
If you have not bought them yet, then I would suggest you post photo of the plug and of the meter and its scale you used to check them.

Readings are usually 0.95 ohms. It the GP's have a pencil tip then you cannot touch the heating element

If you have a wiring diagram, post it.

Post a photo of the side of your engine with the GP's

Dave M7040

 

[atsah]

It is rare for a glow plug to fail. It is far more common for someone to have mis wired them. Some are series wired and others parallel and most don't understand the difference.

If the new ones clearly work better then great.

Dont't confuse the heating time of older GP's with that or modern ones. You cannot overheat the old ones as the resitance increases with temp and the current drops so it is a self limiting situation.
If you have not bought them yet, then I would suggest you post photo of the plug and of the meter and its scale you used to check them.

Readings are usually 0.95 ohms. It the GP's have a pencil tip then you cannot touch the heating element

If you have a wiring diagram, post it.

Post a photo of the side of your engine with the GP's

Dave M7040

My tractor is a 2014.

It痴 pretty cut and dry setup, you apply power to all three plugs through the grid with no relays involved.

I have read many posts concerning hard starting with the GC tractors and I believe it痴 due to holding the plugs in the on position for way to long.

My ohm meter reads 200 -220 ohms on each one, there is clearly no connection and is open internally. If there is no continuity the wire connection internally is broken.

I知 sure I wrecked them myself this past winter by holding them for 20 seconds and then doing it again instead of using my block heater for an hour in conjunction with the glow plugs. The plugs worked fine for the first two years and have become completely worthless.

Holding the glow plugs on and counting is kind of a ridiculous setup if you ask me.

The plugs are directly on top of my engine.

My local dealer tells me it痴 not uncommon for him to replace 100 plugs in three months time in the fall when people need them and when he does he installs a seven second timer as well.

 

[Dave M7040]

Remember I am not trying to argue with you.

if you are measuring 200 to 220 ohms then there is a connection.

If you feel you have matters under control, I will stay away.

Dave M7040

 

[thepumpguysc]

The "norm" is 8-10 sec.. BUT I ran into a "universal diesel" in a sail boat that the customer could not start..
I got the call, went out there & went thru the fuel system w/ a fine tooth comb.. no problem..
did a compression test, no problem..
The fella hands me the owners manual & on the 1ST PAGE was the starting procedure.. "HOLD GLOW PLUG BUTTON FOR 90 sec."!!!!!
I did & the thing roared to life.. damdest thing I ever seen.. 90 SECONDS?? unheard of.. it was in black & white from the owners manual..

 

[Dave M7040]

You young guys with your 8-10 seconds being the norm......

From NGK

NGK Info » Glow Plugs
The pre-heating time for sheathed glow plug is approximately 30 seconds for ordinary type.
When the engine fails to start, turn off the switch once, and pre-heat the plug again


From Kubota for models around L210

This type of glow plug is "self limiting." As it heats less current can flow.

Dave M7040

 

[atsah]

Remember I am not trying to argue with you.

if you are measuring 200 to 220 ohms then there is a connection.

If you feel you have matters under control, I will stay away.

Dave M7040

I have a very good Fluke meter, youæ±*e right there is a connection but not a good one.

After reading your post I decided to further my testing, I applied 12 volts to each plug, none of them would emit heat.

I didn稚 think you were arguing at all and I value your input.

I値l swap them out this week and post my results from a seven second plug cycle.

 

[thepumpguysc]

I don't wanna argue either,, lol
I "think" different manuf. have diff. cycle times..
& most have timers/relays that kick on & off.. & IF you count the time, its "normally" around 8-10 seconds..
Now, some have been cut out of the system by home owners & replaced w/ a push button..
& then there are those that came from the factory w/ push buttons..
Have you ever worked on a GM/Ford diesel car or truck that had been replaced w/ a push button?? The ends of the gp's are swelled, burnt & split..
OH what fun it is trying to get THOSE out..
Please> let us know what your new ones do..

 

[WranglerX]

Have not had issue with 8-10 second preheats on my GC 1715 but then again mild weather here all winter only got down to high 30's a few mornings...

Dale

 

[atsah]

Yes I have, I had to make a tool to get them out of my 6.0 powerstroke. Nightmare.. I video a cold start after I change them.

 

[atsah]

Have not had issue with 8-10 second preheats on my GC 1715 but then again mild weather here all winter only got down to high 30's a few mornings...

Dale

Youæ±*e plugs are working like they should.

 

[Dave M7040]

Your fluke test only has meaning if you know how many electrical terminals are on the end of your Glow Plug.

Most have a single terminal and rely on the connection to the block for a ground to complete the circuit.

Some glow plugs do not use the block for a ground and a very careful examination will show two independent electrical terminals on the end of the Glow plug.

These photos will show you how these terminals are arranged.

Applying 12 volts to a GP removed from the engine is a good way to have it blow up in your face. Please treat them as the dangerous part they are.

This happens for two reasons. Normally they are supplied with around 10.5 volts because of the designed in series resistance of the glow plug indicator. Second, they very much rely on the heat transfer into the cylinder head to slow the rate of expansion of the internal resistance powders. Without contact with the head, the rate of temp rise can cause the insulating powers and the metal jacket around them to fail in an explosive type way.

Dave M7040

 

[WranglerX]

The glow plugs in the ISEKI 3 cylinder in GC 1705 to 1720 series are are grounded in block and use a single busbar (connecting the three) to apply power to center terminal... And power (12 Volts) is applied directly from ignition switch....

Dale

 

[atsah]

The glow plugs in the ISEKI 3 cylinder in GC 1705 to 1720 series are are grounded in block and use a single busbar (connecting the three) to apply power to center terminal... And power (12 Volts) is applied directly from ignition switch....

Dale

Yes, not much to it.

 

[wrangler6831]

I bought a set of these for my GC2600 and they work just fine. Really good price. 3284128M1 Set of Three 3 Glow Plugs for Massey Ferguson MF 1 1 1 135 | eBay

 

[atsah]

I bought a set of these for my GC2600 and they work just fine. Really good price. 3284128M1 Set of Three 3 Glow Plugs for Massey Ferguson MF 11 12 13 135 | eBay

Wow that's a good price for NGK. wonder if they would fit in my GC1705. It's looks to be a different part number.

 

[atsah]

I bought a set of these for my GC2600 and they work just fine. Really good price. 3284128M1 Set of Three 3 Glow Plugs for Massey Ferguson MF 1�1� 1�2� 1�3� 1�35 | eBay

I知 going to give them a go, I知 almost positive they will work.

 

[thepumpguysc]

Just BE SURE to check the length.. the thread size & voltage..