Piston, As>Built Configuration - Mercedes-Benz OM 471 Introduction Into Service Manual

As>built configurations
GF03.10>W>0801H
ENGINE 471.9
1 Piston
2 Combustion recess
3 Piston crown
4 Top land
5 Piston ring zone
6 1st piston ring
7 2nd piston ring
8 Oil scraper ring
9 Bolt eye
10 Piston skirt
11 Piston bolt circlip
12 Piston pin
13 Cooling duct
Feature
Version
Material
Weight (with spring steel sheet)
Piston diameter
Bolt diameter
Surface
Piston (1)
The piston (1) consists of a forged upper section and a forged
lower section, which are connected to each other by means of a
friction weld.
Piston crown (3)
The piston crown (3) is fitted with a combustion recess (2).
Through the combustion recess (2) the clearance volume is
partially transferred into the piston (1).
Top land (4)
The top land (4) protects the 1st piston ring (6) against excessively
heating during the combustion process.
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22
Piston, as>built configuration
OM 471
Two piece
Steel
3,339 KG
132 mm
58 mm
friction optimized
– This printout will not be recorded by the update service. Status: 09 / 2011 –
Piston ring zone (5)
The 1st piston ring (6), the 2nd piston ring (7) and the oil scraper
ring (8) are located in the piston ring zone (5).
The 1st piston ring (6), the 2nd piston ring (7) take on the task of
fine sealing to the crankcase.
The oil scraper ring (8) wipes off excess oil on the cylinder wall and
leads the oil back into the oil pan.
Piston skirt (10)
The piston skirt (10) serves to guide the piston (1) into the cylinder
liner. It transfers the lateral forces to the cylinder wall.
Located in the piston skirt (10) is the bolt eye (9) which supports
the piston pin (12).
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2.8.11
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