I’ve taken the return fuel pipe off and it’s still not obvious how the injector comes out, although I did have a quick look at an online manual and it mentions the use of a slide hammer.
Is that the only way to remove them?

I have a leak from 2 of the 3 injector pipes at the top, ( the long nut ), it appears to be running down the nut and not from inside down the pipe.
I've taken the top flat cover off one of the offending cylinders to see if I could work out where it might be from, this is what I'm looking at, how does this come apart, or, where might the leak be coming from.

I've recently purchased a 1985 Belford dumper with a lister petter 3 cylinder engine, I'm currently sorting out a few problems with it, one of the problems is that the stop mech no longer works, the cable has been removed and when you operate the bit that's left nothing happens.
What should this be operating inside, if I remove it what should be there and am I likely to open a can of worms by removing it.
Any links to a diagram would be really useful