russian gen set.

This is my geny I have had for a few years and only just got it running properly today..Need to know what the engine is and when roughly built...I bought it from a chap in colchestor who used it along with 3 others he imported into the country in the 1990's..1 of the genys caught fire and was destroyed and 1 was broken to keep this 1 going I havent seen another set like this anywhere....

A diagram I found inside the casing..It should be fitted to the vented case..



I assume this bit is the power output top 1 is 17.4 bottom 1 is 21.8 I assume it is kw

hopefully someone knows what this says..