English term (edited): running in

YourDictionary:
running-in
Noun
(uncountable)
- The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established
http://www.yourdictionary.com/running-in


WIKIPEDIA
Break-in (mechanical run-in)
- Break-in or breaking in, also known as run-in or running in, is the procedure of conditioning a new piece of equipment by giving it an initial period of running, usually under light load, but sometimes under heavy load or normal load. It is generally a process of moving parts wearing against each other to produce the last small bit of size and shape adjustment that will settle them into a stable relationship for the rest of their working life.
https://en.wikipedia.org/wiki/Break-in_(mechanical_run-in)


S. Tankosić - Politehnički rečnik:
running-in – razrađivanje (motora i dr.) (maš.)


Tehnička kniga NOVA – Tehnički rečnik:
running in – razrada automobila, razrada motora, razrada novog motora

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Note added at 1 hr (2018-05-23 21:11:13 GMT)
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Ovo bi (po meni) bio prevod za „running-in (period)“ iz prvog dela rečenice, a da bi se prevelo i „pole faces“ iz drugog dela rečenice trebalo bi imati više konteksta ili objašnjenja za „pole“, pošto može imati više različitih značenja i prevoda na srpski.

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Note added at 15 hrs (2018-05-24 10:52:47 GMT)
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Na osnovu tehničkih rečnika koje imam, možda bi moglo npr: pole faces > prednje/čeone površine stožera/stuba ili nešto slično. Žao mi je što vam ne mogu više pomoći.