Needing to replace/repair our auxiliary bmc marine Diesel engine. Bit old but a gem thoughts / ideas / contacts. Many thanks

Thanks Ramona
It is the 1.8 litre version but still called a Captain which is normally associated with the 1.5 litre variant

Ramona said..
I would rebuild it.

+1 to, at least, try the rebuild. Diesel engines are remarkably hardy. The economics of repair v replace hinges on the cost and availability of spare parts.

One good reason to repair is that a new engine might need surgery to your engine beds, which could add to the time and expense. My old beds were in a very poor state, and I am still in the process of rebuilding them. Yours might be in a much better condition, and much easier to adjust, depending on the configuration. For more info on my adventures in my engine bay, see here theboattinkerer.blogspot.com