Renault engine parts
I am sorry you could not find parts - these 30+ yr old engines are now unique specimens. Renault Couach is out of business for a number of years now. I was able to get parts until about 6 yrs ago from a marine diesel shop in San Leon TX, but they stopped working on Renault and sold all their inventory. If you Google Renault couach parts, you will find an unsponsored site in GBR where parts are available (apparently I cannot include the email in my msg). Tony is the owner and has inventory of parts or will have them manufactured (e.g. impellers for my engine). Very expensive parts, but apparently the only source. While its too late for you, you might pass the info around for those who may still be looking.