If anyone reads this **** poor attempt, things I've learnt are

Clean the seats (gently) of any carbon. I used a wide screwdriver and GENTLY scraped the heavy off, then a length of wooden dowel with 800grit wet and dry taped to it, GENTLY lol then a cotton bud taped to other end of said dowel!
Then I used a piece of clean garden hose taped into my vacuum cleaner hose. Compressed air would be better.

Use a little bit of grease to hold the washers on the injectors.

Make sure the washers are not just seated flat on the injectors but central as well.
Careful when you're sliding them down the injector tips.

I used new bolts on the injector clamps the final time as well. Would imagine it helped the seal. For £12 might as well.

When they're back in, run the fuel pump before you put the rocker cover back on and check for leaks topside of injectors. This was my undoing the first time. I had it licked, piece of ****. But one of the replacement o rings didn't do it's job. Once I'd found that and replaced it with an original one I'd had the injectors out a couple of times....washers were scrap then.

Take your time! The simple jobs can bite you on the arse :oops:
 
I have three TD5 Injectors green top that i changed unnecessarily, (see my project thread) still available if you need one, dont what silly money so thats one potential problem sorted.
yes they need to be coded, but you will find someone on here local who will do it for a beer im sure, 5 min job.
The copper washers crush when fitting so cant really be reused (aware you have had em in and out a few times)
They should slide on to injector stems no bother, did you have any were a bit stiff to slide on? might have got a bit distorted when sliding them on etc, only takes a knats cock out of true to cause a problem, very gentle cleaning of injector steams ( non abrasive ) before sliding them on etc
copper is a bit odd it will bend and crush 'once' then needs to be annealed (heated) to reverse bend etc. with washers its not worth it just cos you need then perfectly flat so unless you got a engineering flat press forget it, and fit new uns,
Again they a bit hit n miss, so go original.
engine should be fine they very tough etc, it ran ok for a bit yes? so that means its a fixable thing you wont have done any damage.
you will ave the cleanest sump and oil galleries ever after all this, so the positive is its hade a deep internal clean is all,

stay positive buddy !
Mine ran perfect uncoded, couldnt tell any difference after having them done
 
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Smithy, are you sure you didn’t fit the O ring in the wrong groove the first time?
The injector has two grooves but only the top one is for the O ring.

Could your runaway engine be due to fuel going into the turbo from the sump up the drain tube and finding its way into the compressor? Good job it stopped quickly.

Here’s a photo of my recent failed injector seals (above). I was beginning to doubt they were at fault until I pulled the last one with the black mark.
 
Put one of mine in wrong grove c##ked all oil and filters up’took them all back out spotted my error on one injector. Cost me another genuine set and oil “DoH’ ##
 

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