I fitted a recon engine and had to swap all the ancillaries etc. Took me a few days, I put this to one side for safe keeping as it might be important, then after engine was reassembled I found it and totally forgot what it holds in to place!!
Thanks
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The retaining clip shown is known as an "R" clip... generally never used inside an engine , used on small nuts that are on the end of shafts, or just through a hole on the end of a shaft - example old style turbo actuator.
btw .. my search only found such a clip on the brake booster / pedal attachment