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Due to high temperature in the combustion chamber, the rings expand, reducing the light between the ends of the rings.
To prevent the ends from touching each other and produce mechanical damage, it is necessary to stipulate a minimum value for the light between the ends prior to assembly. Place the rings loose into the cylinder prior to the piston mount them and check the extent of light between the ends.
The chart below shows the reference values for each diameter range of cylinders and the types of rings, which are a good tip when the manufacturer does not indicate other values.
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Nominal diameter of the cylinder(mm)
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Minimum
light between ends(mm)
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Compression
rings
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Oil
control rings
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45
a 59
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0,20
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0,15
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60
a 74
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0,25
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0,20
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75
a 89
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0,30
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0,25
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90
a 124
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0,40
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0,30
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125
a 149
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0,50
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0,40
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Source:
DIN standards.
The
CENTRINEL rings are made with normalized light,
containing the tolerances and specifications of the manufacturers original parts, in nominal diameters of the
cylinders, so there is no need to be modified to be
assembled.
You should never
rasp the tips of the rings with chrome treatment. This operation without appropriate technology leads to shedding of particles that cause engine damage.
Every measure on the ring (STD, +0.50, +1.00, etc..) Is made with a special trading measure by measure, to insure contact with the drum throughout the extension of the ring. This means that a ring STD is created differently than a ring +0.50. It should not rasp the tips of the rings in order to use them in smaller steps (for example, never use a ring in a cylinder +0.50 STD, filing the ends), it will not be achieved through a perfect contact the circumference of the ring, favoring the passage of gases.
We recall that the light between the higher ends than the minimum recommended (within reason, for example doubling the light between ends) has no impact on oil consumption, because the free surface between the piston and cylinder is small frentre to the total perimeter.
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