 The cylinder head is a single unit for all cylinders, and the cylinder head cover and air intake are shared by a single cast aluminum alloy.Exhaust ports 2&3 and 4&5 are siamesed together, presenting an exhaust manifold with only four outlets.The crankshaft is a precision forged unit running in seven three-layer bearings, with counterweights bolted onto the crank webs, much like any other diesel motor of its vintage.