As you have used the word "engineer" in your question it would be impossible for anyone to answer that query. Engineers think differently to most of the rest of us. This is mostly because their hearts have been replaced with rocks which pump a viscous, oily-like substance around their veins. Your engineer will guarentee that that your "new" equipment will never really be ready and will break down frequently. And don't even get me started on NPD. I hope this helps in coming to grasp with this issue.
However if you insist on trying to do your job properly, ensure all lubricants used are food grade, do up a risk analysis that shows you have considered all possible physical, chemical, microbiological and intrinsic hazards related to the machine (is it mobile / hard to clean / does it have hidden corners where product might lodge, are refrigeration gas pipes running through it etc etc). If it's your job, do the same for health and safety. Remove your engineer's cigarette butts and empty coke cans from inside the machine, clean down, swab internally (if available) and externally. Run a trial. Send trial product for microbiological testing. Add machinery to glass and hard plastics register. Do up a cleaning schedule. Validate cleaning schedule. Write up a factory procedure. Train staff how to use machinery. Add machine to regular maintenance schedule. Not a whole heap you can really do after that I reckon.
And before all you engineers on the site start jumping up and down shouting and dragging those knuckles of yours along the ground - my sister is an engineer, so I know what I'm talking about.
