The orings generally get chewed up on removal, even if new. I always replace them. Orings are relatively cheap. The cost of having to redo the job far outweighs the cost of 6 or 7 orings and copper seals.

one at a time is good, but I do the torque sequence together. In other words, put them all in finger tight, then follow the torque instructions for the whole bunch in sequence.
Peter Frederick via Mercedes <mailto:mercedes@okiebenz.com>
January 22, 2017 at 8:39 AM
Absolutely use new copper seals, the o-rings are probably fine.

I do one at a time.

New springs are a good idea, too, as they can also cause uneven idle due to different spring strength from spring to spring allowing slightly different injection timing at idle (same as opening pressure on injectors). An annoyance, but that 5 cylinder is prone to vibration at idle anyway and you don't want more.

Peter

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