A.
The section of the engine which contains the rank shaft, and link rod assemblies, cams,cam drive gears,tappet guides,rollers,carriers,etc.
B.
The engine contains the crankshaft, and link rod assemblies,cams,cam drive gears,tappet guides,rollers,carriers,etc
C.
The important section of the engine which contains the crankshaft, and link rod assemblies,cams,cam drive gears,tappet guides,irollers,carriers,etc.