37
Pistons
The pistons are of aluminum and have two compression
rings and one oil scraper ring. The upper compression
ring, a Keystone ring, is coated with molybdenum which
contributes to reduced cylinder wear. There is a ring
carrier of a special tempered cast iron alloy for the up-
per compression ring which considerably increases the
service life of the pistons, rings and liners. The pistons
are cooled by a regulated quantity of oil directed against
the bottom of the pistons from a jet in the cylinder block.
The oil cools the piston and is returned to the sump.
The combustion area at the crown of the piston is de-
signed to provide uniform distribution of the fuel and ef-
fective combustion.
The illustration shows the gears for:
1.
Drive gear, crankshaft
2.
Intermediate gear, oil pump
3.
Drive gear, oil pump
4.
Drive gear, engine coolant pump
5.
Intermediate gear, right
6.
Intermediate gear, upper
7.
Drive gear, camshaft
8.
Drive gear, injection pump
9.
Intermediate gear, left
10.
Drive gear, hydraulic pump
11.
Drive gear, seawater pump
Timing gears
The camshaft, engine oil pump, injection pump, seawa-
ter pump and hydraulic pump, if fitted, are all driven off
the crankshaft via helical spur gears.
Helical spur gear wheels are used in order to keep en-
gine noise to a minimum.
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