Bad Injector on New Holland tractor??

[CAgnoli]

Hi all,

My 2000 New Holland TC25D4 is knocking something fierce with only 346 hours on it. I asked a local diesel mechanic, and he said that a clogged injector will do that?? He told me to put a heavy load on the tractor for about fifteen minutes to see if it clears up.



He also told me that it's okay to run the tractor that way???? It doesn't add up to me, can a bad injector really make the engine sound like it's about to lose a valve?



I would hate to follow his advise, and grenade the motor... .....

 

[DBogo]

i would take it easy and run some injector cleaner through it thats what i would do first

 

[David Oxland]

knokcing under what conditions? light load all loads? Common rail inj?

 

[DBogo]

its not common rail, if my memory serves me correctly its a mechanical injected iveco diesel

 

[gtobey]

You are correct DBogo, Iveco engines are in New Holland tractors. We do fuel injection here at our shop.



I would not run it very long, or very hard that way. If an injector is sticking or leaking, you can overheat that cylinder, wash down the cylinder walls with fuel causing ring problems later, etc. See if you can crack the lines at the injectors one at a time (carefully, so you do not inject fuel under high pressure under your skin, and be sure to protect your face and eyes when loosening the line nuts!) and determine which cylinder is making the noise. If it is a "fuel knock", when you loosen that line to that cylinder and the noise stops, that is the one that is problematic! You can save time and effort by not having to pull all the injectors if you can tell which one or ones are causing the problem.



Sometimes you can clear an injector that has "coked" up from deposits in the tip area or sticking slightly from lack of lubrication in the fuel by heating it up under normal load. But most times you can't get it cleared up that way. We have been able to double dose some engines with STANADYNE Performance Formula and run it for a short while under normal load and have it clear up. The other alternative is to pull them out and have the injectors tested at your local fuel injection repair facility. But prior to that, I'd give the STANADYNE Performance formula a try. We have noticed a severe lack of lubrication in the fuel in our area of VA recently, and we are not supposed to have the ULSD fuel yet. I would hate to see it come if it is worse than what we're getting now.



Any questions, I'll be glad to try to help. You can also get in touch with your local ADS and Bosch fuel injection repair facility and I'm sure they'll be happy to assist you!

 

[Hohn]

Well, it's a FORD, so injector problems aren't entirely unheard of

 

[TFucili]

I'm not familiar with that particular model, but many of the FNH compact utility and medium utility tractors were made by and powered by Shibaura, a Japanese company, much like the Deere/Yanmar affiliation.



I would agree with gtobey saying that if a mega-dose of injector cleaner doesn't clear it up in short order yank the injector(s).

 

[CAgnoli]

It knocks as soon as you start it up. It seems that if I bring the throttle up, the knock increases in tempo with throttle to a point, but obviously, once I pass a certain point, I can't hear it any longer over the exhaust.



I'll try the injector cleaner Saturday, and see what happens. It just started happening, and it takes me four hours to mow my lawn. I'm not sure if I should run it that long in its current condition though... .



Thanks for the help

 

[gtobey]

It knocks as soon as you start it up. It seems that if I bring the throttle up, the knock increases in tempo with throttle to a point, but obviously, once I pass a certain point, I can't hear it any longer over the exhaust.



I'll try the injector cleaner Saturday, and see what happens. It just started happening, and it takes me four hours to mow my lawn. I'm not sure if I should run it that long in its current condition though... .



Thanks for the help

If it gets louder and obviously not going away as you run it, then yes, stop it and yank the injectors. After the additive is in it and you start to mow if it doesn't get louder under load or louder at idle than it was before, you can run it for about an hour. If it doesn't get better then, well, time to pull them and have them tested or try to diagnose which one it is...



Good luck!!!