4100 glow plugs: John Deere Review  -- John Deere Tractors Discussion Forum and Review 4100 glow plugs: John Deere Review -- John Deere Tractors Discussion Forum

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 11-11-2003, 17:28 Post: 68500
jcslocum



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 4100 glow plugs

Hello all,

JD4100 HST
512 Hours
5 years old

I have a JD4100 HST tractor that is now with the colder weather very hard to start. Today I began poking around under the hood to see what I could find. It appears that all 3 glow plugs have burned out. I have used a volt meter and there is 12.5 volts to each of the glow plugs when the key is turned to the *ON* position. I'm not much of a
beliver in coincidence so while all 3 plugs seem to be burned out, I think that there is a deeper problem.

I pulled all 3 glow plugs out of the engine and 1 seems to have a small crater in it while the other 2 look to be good, visually that is.

I grounded the glow plugs one at a time to the block and aplplied power to them but none of them got hot. The applied voltage was 12.5 volts.

The ohmmeter does not regeister any resistance when attached to the post and the outer body (ground).

I think that there should also be a timer/controller to *time-out* the glow plugs afer the engine starts. This does not seem to be happening. I left the key in the *on* position for 90 seconds and the voltage didn't shut down.

Is it possible that with no load the timer won't work?

I assume that if the timer/controller has gone bad it will burn out all 3 glow plugs.

So, a long first post. I have ordered 3 glow plugs from the local dealer here in NY and will install them by the end of the week.

Thanks in advance for any help or insight.

Jon Slocum






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 11-11-2003, 18:28 Post: 68506
Chief



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 4100 glow plugs

I am not up that much on the 4100's such as yours but I will take a swing here. My instincts are telling me that there is a glow plug relay in the sytem somewhere and might be possibly sticking. I would think that you must either push the key in or to a designated position to activate the glow plugs. They should not be activating when you turn the ignition switch on.

That may account for why all 3 plugs are burned out. The relay/timer may have been sticking and the plugs remained on all the time until they burned out. A long shot could be a bad ignition switch (unlikely)

DO NOT under ANY circumstances us ether to start the tractor. You may be replacing more than glow plugs after that. If you don't already have one installed you may want to consider a block heater to help cold starts as well. Mark or some of the others here I am sure will jump in with more experienced info.






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 11-12-2003, 06:05 Post: 68527
TomG

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 4100 glow plugs

Glow plugs are pretty reliable things and Chief's explanation is my best guess as well. There's probably an indicator that glows when the circuit's been on awhile and I'm curious if an indicator stayed on after the tractor started when the plugs were working. I think most indicators don't measure combustion chamber temperature but are just resistive wires that heat up and glow after they've carried current for awhile. Such an indicator wouldn't come on if the plugs were open.

The only other explanations seem pretty far-fetched--things like a stuck relay combined with over voltage from the charge system or simply wrong glow plugs. My system is a simple turn the key one way and wait for the indicator to light up and then a little longer depending on temperature and then turn the key to start. If there's a relay, I'm not sure it's an improvement over simple, although high current does flow through my start switch.






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 11-12-2003, 07:05 Post: 68534
jcslocum



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 4100 glow plugs

There is no dash indicator showing thatthe glow plugs are on. There is also no special place for the key for activation. You just start it up. No kidding!






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 11-12-2003, 08:31 Post: 68540
Murf

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 4100 glow plugs

Jon, it sounds like your machine has an automated glow plug system. This type of operation is normal in automotive diesels.

Basically the glow plugs are energized by a relay as Chief noted, however the relay is in turn controlled by heat, the engine temperature. If the engine is cold, the plugs have power, if the engine is above a certain temperature, either from running, or just the anmbient temperature, the relay does not power up the glow plugs.

If your system is as mentioned above, you will have 12v. to the glow plugs till the engine gets warm. Try running it to operating temp, then check for voltage again, if you still have 12v. wghen the motor is hot then you need to look farther.

Is the engine temerature gauge working properly? It is porbably the source for the temperature signal.

Either way glow plugs usually last a VERY long time. They will not however stand a cold blast while heating, if someone were to give the engine a shot of cold WD-40 while the glow plugs were hot it would probably burn them out right away.

Best of luck.






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 11-12-2003, 08:36 Post: 68541
DRankin



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 4100 glow plugs

When you first turn the key on your 4100, you see the dash lights come on and then you hear a click and they dim a little.

If you wait about 6 seconds you hear another click and the lights brighten.

I think that this interval, where there is a power draw, is when the glow plugs are active on the "indirect injection" Deere engines.

This design is found on the 2210, 4010, 4100 and 4110 but not on the 4115 and larger CUT's.






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 11-13-2003, 07:47 Post: 68623
TomG

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 4100 glow plugs

Cost cutting again! That's the only reason I can figure why there wouldn't be an indicator so you can tell if the automatic system failed. There was a similar discussion maybe about Kubotas where an indicator light was staying on so all automatic systems aren't equal.

I don't recall if the discussion had a conclusion though. The problem there was figuring if the system or the indicator failed, but at least you knew something was wrong. Sure must have been a challenge for the alternator while the plugs were burning out if that's what happened and there's a good change that the relay was continuously energized after they burnt out. It'd be good if the relay is rated for continuous operation. Good thing the cost cutting folks haven't discovered nuclear power reactors.






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 11-13-2003, 08:05 Post: 68625
jcslocum



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 4100 glow plugs

Installed new Glow Plugs yesterday. $111 for 3 from the local JD dealer. Installed them and the tractor starts instantly like it always did. I let the voltage run for 30 seconds after the engine had started and then pulled the plug on the relay to shut them off. I'm afriad of burning them out again becasue I have no idea how long they can run before buring out. I'll order a new relay; $80 and see if that shuts off the juice after running.

Thanks for the help.






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 11-13-2003, 10:39 Post: 68639
kwschumm



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 4100 glow plugs

Mark, do the 4010/4110/4115 tractors utilize a flashing trouble code indicator light? Or are those only on the computerized models? I'm curious if the 4100 has such a thing.






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 11-13-2003, 10:55 Post: 68644
DRankin



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 4100 glow plugs

Nope. I think that stuff only comes on the computerized models.






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