Operation
3403−1/A1
Winterthur Gas & Diesel Ltd.
1/ 2
Piston
1. General
The piston has the parts that follow:
D Piston crown (1, Fig. 1)
D Piston rings (2)
D Piston skirt (3)
D Piston rod (4)
D Oil pipe (5)
D Compression shim (6).
Ten elastic bolts (9) and round nuts (8) attach the piston crown (1) and the piston
rod (4) together. The piston skirt (3) is directly attached to the piston rod (4 )with
screws.
The piston rod (4) is attached to the crosshead pin (7) in a specified position. The
compression shim (6) is installed between the piston rod (4) and crosshead pin (7).
The thickness of the compression shim (6) is related to the compression ratio.
Note: The mark TOP on all piston rings must point up. For more data about the
piston rings, see the Maintenance Manual 3425−1.
2. Piston cooling
Lubricating oil is used to cool the piston crown (1, Fig. 1). This cooling oil flows from
the crosshead pin (7) into the two oil inlets (OI). The cooling oil then flows through the
oil pipe (5) (inside the piston rod (4)) to the spray plate (10). The cooling oil comes out
as a spray (OS) from the nozzles in the spray plate (10) into the cooling bores of the
piston crown (1). The oil then flows through the oil return (OR) into the crosshead
pin (7) and out through the ol bores to the crankcase.
2014
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