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Explanation: Disclaimer - my knowledge of motor boats to a couple of trips out on the Solent!
Just thinking aloud really! I did a Google search on 'auge moteur' and came up with one hit, in the specifications for a motor boat! This lead me to believe that the term is either a typo or a pretty unusual coinage ...
On the basis that you're fairly likely to recognise a typo, I started thinking. Plugged in 'engine trough' and 'motor trough' into Google, and got about 15 hits for either. Unfortunately, nothing looked quite so promising once I'd discounted the misspellings of 'through'!
So the above is really just speculation, based on the fact that it's getting drained.
Mary Worby United Kingdom Local time: 08:31 Native speaker of: English PRO pts in pair: 484