Renault (!) diesel question

[Guzzi]

A friend (yes, really!) recently bought a Helms 27 with a low hour (525) Renault R16D engine. Since he has no computer (not even a cell phone!) I'm posing this to the "experts" here.
He being a retired metro transit diesel engine mechanic wanted to go over his engine and make sure all was well.
The manual really doesn't show much abiyt it so he has two questions.

First, is there an oil drain plug on this engine and if so where exactly is it located. He hasn't been able to find one so he assumes there isn't one and will buy a Mighty Vac.

Two, the manual doesn't show a thermostat for the cooling system. This is an open system.
Why wouldn't there be one? It seems in cold water the engine wouldn't reach proper operating temperature.

Thanks in advance.

[never monday]

The best thing he can do with the Renault is start looking for it's replacement. There haven't been new Renault parts available in the US for almost 10 years.
He should suck the oil out. There is a thermostat. It should be in the head at the water outlet.

[Guzzi]

He's already buying a 9.9 4 stroke kicker in order to save the Renault as much as possible.
If the Renault breaks he will probably remove it and renovate the gained space for storage.
Thanks much!

[Chief Engineer]

If it is a Renault -Couach(sp) ya gotta go to England for parts. $$$$$$$$

[GordMay]

I’m confused.
The Renault 16 was a French car (not an engine) produced between 1965 and 1980.
See: Renault.com - The vehicles

[Stranded Mariner]

Originally Posted by GordMay

I’m confused.
The Renault 16 was a French car (not an engine) produced between 1965 and 1980.
See: Renault.com - The vehicles

Oh, yes. I remember those. My father bought one in 1970. They were considered quite an innovation back then. However, I don't recall if there was a diesel version.

[Guzzi]

Don't to be confused, the RC16D is a marine engine...he has da book!

And he has the # for Renault Couach Marine in the UK.

Thanks!