5.3.7 Piston
The piston moves in each cylinder. The piston rings seal the combustion chamber. The piston
transmits the force from the gas that expands in the cylinder to the crankshaft through the
connecting rod.
Elastic bolts (008, Figure 5-24) and round nuts (009) attach the piston crown (001) to the piston
rod (004). The piston skirt (003) is attached to the piston rod with screws. The piston rod (004)
is attached to the crosshead pin in a specified position. The compression shims are installed
between the piston rod and the crosshead pin. The thickness of the compression shims is
related to the specified compression ratio.
System oil is used to keep cool the piston crown (001). This oil flows from the crosshead pin
into the space (005) between the oil pipe (007) and the piston rod (004). The oil then flows to
the spray plate (010). The oil comes out as a spray from the nozzles (011) into the cooling bores
of the piston crown (001). The oil then flows through the oil pipe (007) into the crosshead pin
and out through the oil bores to the crankcase.
Fig 5-24 Piston (example)
003
002
001
004
011
008
007
006
009
010
005
Legend
001 Piston crown 007 Oil pipe (from piston crown)
002 Piston ring groove 008 Elastic bolt
003 Piston skirt 009 Round nut
004 Piston rod 010 Spray plate
005 Space 011 Nozzle
006 Oil flow
X92DF
AA00-3403-00AAA-043A-A
Operation Manual Piston
Winterthur Gas & Diesel Ltd.
- 190 - Issue 002 2020-08
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