Greetings

I have just had the please of acquiring a 1965 190 d. the body is in perfect condition (minus some tiny rust spots) and am looking to learn more about it. Some problems im having with it are--> water leaking from the block somewhere behind the injection pump (were freeze plugs used in these cars). The car will run thru the 4 forward gears fine but i cannot find reverse ( does the car have to be running to find it). and last but not least the car was running low on diesel (prolly 1 gallon in the tank) and it started to smoke white. is this a lean mixture or water?

possible causes of any of these situations or corrections are greatly appreciated

jeff dalton