112 Motor Grader - steering, engine info, pony motor

Good day all, I have a "new to me " 112 Motor Greder 68E400 I'm in need of engine valve adjustment specs (probably on this site but I dont know what engine it is other than 4cyl na diesel). The pony motor has had parts try to escape through a window next to a connecting rod, so looking for parts or a replacement pony. Also has power steering box upgrade and the output shaft is sheared at the pitman arm splines. It does run and drive (can steer with camber lean). Thank you for your help.

68E400 is a 1960 model with D330a (4-1/2" bore) engine and whats referred to as a "buzz bomb" pony motor.
Same engine as is found in the D4C and D tractors.

So were these Buzz Bomb pony motors called this because of their sound or were the known for blowing up???

Throwing rods.