why is my injector thread locked? I need more answers please

[ib4hoyt]

dang, did i poke a hornets nest? Im sorry if i did, i didn't mean to and had no idea this was a sore subject... all i wanted was some advice on my injectors.

so to up date this a little bit, i got to thinking what you guys said and im thinking your right about me messing them up. so this morning i went to John Deere and bought 4 new ones. got back to the dozer that has set for 2 days and its in the 30s at night and 40s today here, figured it might not start so well.... i turned on the battery switch, turned the key, hit the starter button and it maybe turned over 3 times and started right up, set there purring like a new one!!!!! I cant tell any things wrong on it, no pops or anything strange, runs strong at any throttle setting! So now i don't know what to do,, do i just run it like it is and take these back? or should i just change them and get it off my mind? I can't see where it would hurt the engine or system if it was out and i run it. what little i ran it today testing it, i cant tell any power loss at all. Help!!

[jdemaris]

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so to up date this a little bit, i got to thinking what you guys said and im thinking your right about me messing them up. so this morning i went to John Deere and bought 4 new ones. got back to the dozer that has set for 2 days and its in the 30s at night and 40s today here, figured it might not start so well.... i turned on the battery switch, turned the key, hit the starter button and it maybe turned over 3 times and started right up, set there purring like a new one!!!!!

I've seen brand new Deere 350Cs and 450Cs that would not start at 50 F without a lot of smoke, sputtering, etc. So, you're doing pretty good.
I don't know if you now have one injector set a little out of wack. If it was mine, I wouldn't worry about it. You don't even know if you can get your old ones out yet - do you? Pencil injectors can get very stuck. I've have to pull the heads off a few Deere engines and drive them out from the inside.

We had many (if not most) customers that only changed injectors when one stopped working completely and the engine skipped (kind of like a fouled spark plug). I never witnessed any harm done by such an event. I've also pulled apart many good running engines and the injectors tested poorly. That tells me that less-then-perfect injectors may effect overall fuel efficiency but often have little effect on easily observed performance.
Most of the time that I've put all new injectors in an engine was during a complete engine rebuild when we had to warranty the job.

I understand your concern and don't know what to tell you. My take is - if it runs good -leave well enough alone. If it was skipping and there was a chance one injector was not opening and the hydraulic pressure was spiking to 10,000 PSI in the injection pump - I'd be concerned. If it was a car or truck and you had to take a 4000 mile trip with it, I might feel differently. One case-in-point is my Dodge-Cummins diesel truck. At 200K miles it was still running perfect but I had a long trip out west planned. I worried about an injector failure out on the road somewhere. So I pulled out all injectors and tested. All tested perfect. I put on new tips anyway - which might seem like a waste of money. Who the heck knows?

In your situation, I'd worry if it started NOT running correctly.

[ib4hoyt]

i ran it for about 4 hours today, i couldn't ask for it to do any better than it is,, i believe tomorrow if i get the time i will see if Deere will take these back. Thanks to all that helped me out. ill update later on if something happens.

[ib4hoyt]

have run it about 60 hours since ,,alls well with it sofar,, its been down in the 20s at night, it fires up after 30 sec or so. im building a pond,,, neighbors call it a lake,, but its a pond.