Operation
3403−1/A1
Winterthur Gas & Diesel Ltd.
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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).
Nine elastic bolts (8) and round nuts (9) attach the piston crown (1) and the piston rod
(4) together. The piston skirt (3) is attached to the piston rod 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 and crosshead pin. The
thickness of the compression shim 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 keep the piston crown (1) cool. 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 oil bores to the crankcase.
2014
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