7020 leaking injector sleeve

My I pulled my 7020 in the shop for what I thought was a leaking manifold gasket to find compression coming out of injector hole #1. Guessing it’s a cracked head maybe? I overhauled the engine 2 years ago and had the head planed, magnifluxed, valves redone, and the agco dealer install new copper sleeves in it while it was off. It gets used as an auger tractor and may have been overheated and nobody caught it or told me. What’s my best options? Older style head, any good shops left to weld and press new sleeves in?

I've run into this issue before, someone replaces injector bolts with something generic, which ends up being slightly longer, and bottoms in threaded hole before fully clamping the injector down in the hole. Easy enough to check it, back out one bolt, remove lock washer, and screw it back in, it should go all the way down easily. 

301 engines in 7010/7020 kind of have an issue with exhaust manifold bolts loosening at times. Muffler is too heavy. The  OEM exhaust bolts are SPECIAL thread and a hardened flat washer needs to be used, not a lock washer, which can break. Check torque every oil change and eventually they will get rusted in place and not loosen.    Before yanking the cylinder head, I'd sure at least try a lock washer under the head of each injector hold down bolt and oil the threads. Might have ran too long with compression squeaking by. There should be no copper washer/gasket on the injector tip end. 

Edited by DrAllis - 28 Feb 2021 at 7:51pm

I can confirm a leak around a copper sleeve from a crack in the head will cause the tractor to run warm and put compression in the radiator.  That was my experience on my 7000.  If you think you have a bad sleeve, pull an oil analysis and see what it tells you.  It doesn't take burning much antifreeze to show up in an analysis.  

yes, it could have pushed the bottom of the copper tube out. 

Did you try to move the injector to a different hole to see if the problem followed the injector or stayed with that copper sleeve?  Long shot, but better to try it now while the engine is assembled.  If the coolant is low (even with a known potential leak), I'd definitely run an analysis of the oil.  Very cheap source of knowledge.  

And the suggestion to add ONE WASHER was just to be certain the bolts were not bottoming out in the holes, thus not achieving proper squeeze on the injector tip into the copper sleeve. Three washers wasn't suggested.

If I remember correctly when I changed my 7000 to the old style head without the copper cups, the injector nut was different.  Ed did them for me.  I cannot remember if the nozzle also had to be changed to a different model (I believe he changed them due to age when he had them).  The 8000 series with 426's used bosch injectors as well, so that may be an option to find a bosch injector nut that fits an old style head.  Also, the 185s had bosch injectors towards the end.  I don't know if that came with the new style head, though?  If not, that would be another model that has the bosch injector with the old style head.