so ive looked around,(well some,,) and i cannt find a diagram of injectors. i found a 'supposed' pic at tdi club, but it looks like its inaccurate. i had cleaned out my nozzles, to no luck, so i have 2 choices, just get new nozzles; and take a chance and put them in,,and assume. maybe find someone to pop test. another is ship injectors off to either (a) bosch or an independent shop to have them re-done.
so when i cleaned out nozzles, and couldnt find any service info in shop manual, 2 of the injectors i took out the 'upper' part of innards. and cannt find an accurate diagram to make sure i have back together correctly, so if-i-recall,,had the injector body, insert smaller spring, with retainer, then i put in pin, then small spacer (with a hole in it,for pin), then big spacer, that sits on smaller spacer, and injector inner lip/body, then bigger spring with retainer, then pinned 'cap', with what im described as a bushing, sits on/around pin, then nozzle and 'lower' part of body goes together, cleaned of course, oh yea the pin, or plunger goes in. torqured to 33. so i wasnt sure as in one of the injectors, when i reassembled upper end, the pin sat differently, it was just about even with the pined cap/ along with bushing insert. the other injector the 'bushing' was sitting a little high, and didnt go all the way in pinned cap, but seemed to be blocked/sit on the big spring retainer, that pin was sitting higher, and looked better. like there was some tension (on next level, nozzle, pin/plunger assy). as i said i took apart 2 of the upper assys, and there i found no reason to need to clean that end. hey i keep a good filter in there, and run lube, and run a can of flush(LM or SF) from time to time.