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It's been a few years, but these are things that stick out:
1) Leave fuel lines connected to injectors (till later)
2) Use an "L" shaped prybar under the hose connection nut to lever the injector up and clear of the holder. Expect some resistance as the fat o-ring comes out of the groove in the holder. The o-ring usually comes out with the injector.
3) Remove the holder bolts and carefully twist and pull upward. Heavy-duty expanding snap ring pliers stuck down inside the holder make a good removal tool
3a) Look at the thin o-ring as you pull the holder out. You may see one sort of "smeared" out of its groove. Any part above the groove has been that way since it was installed. (Something to avoid.)
4) To avoid #3a, clean out the bores before replacing the holders. Plumbing supply places sell round wire brushes (like for cleaning the inside of copper pipe) that work well for scrubbing out the hole where the holders fit. I think that wire brush is too big for the inside of holders themselves, but do some cleaning there too.
5) After cleaning the holder bores and holders, smear a little grease or anti-sieze in the bores, fit the thin o-ring on the holder, ease it into place (avoiding 3a above), then reinstall the holder bolts.
6) I separate the injectors from the lines (opposing wrenches), cut the old fat ring off, clean off the carbon build-up on a wire wheel, then install the new fat ring on the injector (lube and effort required to get it started).
7) insert the injectors unto the lubed holders and press "home" with gentle persuasion—like a socket and extension tapped lightly with a small hammer. That fat ring is a snug fit going in too.
That's all I can think of. Others will probably chime in with their tricks and tips.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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