You should be able to find new and/or used parts. The 912 series ran for a while. they were in 3-6 cylinders. F3L912, the F stands for a "mobile" engine (Deutz pronounced Doy-tz BTW, also builds very large stationary engines), the 3 number of cylinders, the L for Luft (air cooled) and the 912 series.
A W at the end means it has a pre-cup chamber in the head. Screw in injector, these were low emmission engines usually used in mines. Heads are different, head bolts are the same.
I rebuilt several hunder of these and other Deutz engines. I still some specs on these around the house somewhere.
Good Luck,
Rob