Page 58 - Introduction to Marine Engineering
P. 58
Diesel engines 45
Exhaust
vatve
Turboblower
Air cooler
Bedplate
Figure 2.28 Sulzer RTA72U engine
to ensure accurate mesh of the camshaft drive gears which are enclosed
in this section.
Individual cast-iron cylinder blocks are bolted together to form a rigid
unit which is mounted onto the A-frames. Tie bolts extend from the top
of the cylinder block to the underside of the main bearing saddles.
The crankshaft is semi-built, with the combined crankpin and
crankweb elements forged from a single element. The journal pins are
then shrunk into the crankwebs. For all but the larger numbers of
engine cylinders, the crankshaft is a single unit. The main journal and
