Products in the engine

Pistons

Developed and produced drawing on the state of the art

Motorservice always supplies pistons complete with piston rings, piston pins and the associated piston pin circlips. These expertly coordinated components make ordering easier for you.

Aluminium pistons

Aluminium pistons are light and have ideal thermal conductivity properties. They feature integral reinforcement parts, such as cast iron ring carriers, steel parts for defined thermal expansion or ceramic fibre reinforcements of aluminium oxide, depending on the intended application.

Articulated pistons

Articulated pistons are used in the construction of utility vehicle diesel engines when conditions are too harsh for aluminium pistons. They consist of a steel upper section and an aluminium piston skirt. Both these parts are connected with friction-locking by the piston pin. Compared with aluminium pistons, articulated pistons boast higher strength in the steel upper section. This makes them more resistant to high pressures and temperatures.

Steel pistons (monobloc)

Steel pistons are forged from highly heat-resistant steel with high stress endurance. They withstand high ignition pressures, even at maximum temperatures. They are therefore used in heavy-duty diesel engines in utility vehicles and passenger cars, where they ensure maximum service life and superior reliability. Working in co-operation with various American and European engine manufacturers, Kolbenschmidt has successfully developed steel pistons for utility vehicles and passenger cars in recent years.

Compressor pistons

These aluminium pistons are used in piston compressors to generate compressed air in utility vehicles. They are subject to a lower thermal load than engine pistons, as they are not exposed to combustion.

Whether it's special coatings such as LofriKS®, NanofriKS® or graphite coatings or special piston pin bores (Hi-SpeKS®) to increase wear resistance and durability – Kolbenschmidt is a leader in cutting-edge technology for piston development.

Further information

Technical names and names on the piston

1 Ø bowl
2 Piston crown
3 Combustion chamber (bowl)
4 Piston crown edge
5 Piston top land
6 Compression ring groove
7 Ring land
8 Groove base
9 Recessed ring land
10 Groove sides
11 Oil scraper ring groove
12 Oil return bore
13 Piston pin boss
14 Retention for groove distance
15 Groove for retainer ring
16 Piston boss distance
17 Piston boss distance
18 Stepped edge
19 Piston diameter 90 °C against the piston pin bore
20 Piston pin bore
21 Bowl depth
22 Skirt
23 Ring zone
24 Piston compression height
25 Piston length
26 Oil cooler duct
27 Ring carrier
28 Bolt bush
29 Ø measuring window
30 Crown camber

Gap Dimension and Top Dead Centre

Gap dimension

The gap dimension (B) is the protrusion or recess of the piston in the top dead centre in relation to the sealing face of the cylinder block. The thickness of the cylinder head gasket and a possible recess in the cylinder head are taken into account for measuring. This dimension is also known as “lead dimension”.

Piston protrusion or piston recess dimension in top dead centre for different engine versions

Below the dimension C, the protrusion (marked by + ) or the recess (marked by - ) of the piston in the top dead centre is to be understood in relation to the cylinder block sealing face. The seal thickness or geometrical shapes of the cylinder head are not taken into account.

For engines with wet cylinder liner, the protrusion or recess of the piston is also measured in relation to the cylinder block face. A protrusion of the cylinder liner or an existing land edge is not taken into account.

For air-cooled cylinders, dimension C refers to the distance between piston crown and the seat of the cylinder head on the air cooled cylinder. 

For setting the piston protrusion, pistons with reduced compression height are also available in addition to the standard pistons.

For pistons the crown for setting the piston protrusion must not be turned off.

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