4300 glow plugs?

[Harry in Ky]

By cold start I'm referring to the first start of the day. The day I was there the temp was near 50. It shouldn't have needed heat, since it's apparently direct injection, not a glow plug engine, I didn't know that at the time. Next time I will pay more attention to the fuel side of things. Once it's running there is no evidence of internal problems or compression issues. The oil doesn't have a burnt smell or evidence of exhaust contamination. It runs smooth, and the exhaust seemed clean enough as I recall. Although with the hydraulic issues it has, I didn't run it all that long. I have a bit more insight as to what to look for now.

 

[Harry in Ky]

Another question. When the key is turned on can you hear the injection pump solenoid clack? If not check or replace the thermistor that controls solenoid amperage. It should be in a wiring bundle behind the fuse block. They are under ten dollars.

Sorry, I'm not really up to speed on John Deere's thermistor concept. I understand the principal (for the most part) but haven't had much experience with dealing with problems in that area. I would think if that were an issue here it probably wouldn't start or run at all. Is that not what usually happens when one fails?

 

[pmsmechanic]

My 4410 (similar engine) starts very easily down to about -10C (14F) without any glow plug use. Just so you have an idea of how your engine should start.

 

[Egon]

Sorry, I'm not really up to speed on John Deere's thermistor concept. I understand the principal (for the most part) but haven't had much experience with dealing with problems in that area. I would think if that were an issue here it probably wouldn't start or run at all. Is that not what usually happens when one fails?

The thermistors have been a problem in the past and their performance may vary. I’ve had a lot of thermistor problems with my JD 4200. Could not find it as it was well hidden inside of a cable bundle.

They control the amperage to the injection pump for start up and long time running.

 

[Harry in Ky]

Okay, but what are the symptoms of a failure of the part?

 

[Egon]

Okay, but what are the symptoms of a failure of the part?

you will not hear a clack and the engine turns over but gets no fuel.

 

[Harry in Ky]

Sounds like a failure there would result in the engine not running at all. This one seems to run just fine once it gets going. It seemed to to start just fine the second time.

I'll listen for the solenoid next time out there.

 

[rScotty]

I don't know about the 4300 specifically, but not many if any of those Yanmar engines used glow plugs.

Instead, they used a pre-heater in the intake manifold. Called Yanmar Thermostart, It is basically a little container of diesel fuel that drips a few drops onto a heated coil. Often triggered from the ignition key circuit. They tend to make a little
"pop" sound when actuated.

Look under the hood and see if there is a plastic container suspended above the intake manifold. If so, see if it has fuel in it.
Here is an article on the Yanmar Thermostart system

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rScotty

 

[Harry in Ky]

This tractor has nothing like that. I expect it's more like this.

https://partscatalog.deere.com/jdrc/sidebyside/equipment/75863/referrer/navigation/pgId/2784560

I see them on a number of different engines on many tractor makes. Deere uses something very similar on the 5000 series. I've seen them in many places commonly referred to as a grid heater.

 

[rScotty]

O

This tractor has nothing like that. I expect it's more like this.

https://partscatalog.deere.com/jdrc/sidebyside/equipment/75863/referrer/navigation/pgId/2784560

I see them on a number of different engines on many tractor makes. Deere uses something very similar on the 5000 series. I've seen them in many places commonly referred to as a grid heater.

Sure, that would work. I'd suspect that grid systemwould use a bit more amperage - which might be an issue but more likely just a good reason to keep the battery and cables strong.

What bothers me is that it needs any help in Ky..... And I see a couple of others say the same. Their comments parallel my thinking. From what you describe about the tractor, the compression on yours sounds good. That doesn't surprise me. It should be - those engines are known to be good ones and long lasting. So I'm stumped and hope you post when you find it.

All taken together, it seems like you may need to look for something other than a malfunctioning intake heater.