METRIC CONVERSIONS

1993 Nissan Sentra

GENERAL INFORMATION

METRIC CONVERSIONS

METRIC CONVERSIONS

Metric conversions are making life more difficult for the mechanic. In addition to doubling the number of tools required, metric-dimensioned nuts and bolts are used alongside English components in many new vehicles. The mechanic has to decide which tool to use, slowing down the job. The tool problem can be solved by trial and error, but some metric conversions aren’t so simple. Converting temperature, lengths or volumes requires a calculator and conversion charts, or else a very nimble mind. Conversion charts are only part of the answer though, because they don’t help you "think" metric, or "visualize" what you are converting. The following examples are intended to help you "see" metric sizes:

LENGTH

Meters are the standard unit of length in the metric system. The smaller units are 10ths (decimeter), 100ths (centimeter), and 1000ths (millimeter) of a meter. These common examples might help you to visualize the metric units:

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A meter is slightly longer than a yard (about 40 inches).
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An aspirin tablet is about one centimeter across (.4 inches).
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A millimeter is about the thickness of a dime.

VOLUME

Cubic meters and centimeters are used to measure volume, just as we normally think of cubic feet and inches. Liquid volume measurements include the liter and milliliter, like the English quarts or ounces.

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One teaspoon is about 4 cubic centimeters.
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A liter is about one quart.
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A liter is about 61 cubic inches.

WEIGHT

The metric weight system is based on the gram, with the most common unit being the kilogram (1000 grams). Our comparable units are ounces and pounds:

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A kilogram is about 2.2 pounds.
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An ounce is about 28 grams.

TORQUE

Torque is somewhat complicated. The term describes the amount of effort exerted to turn something. A chosen unit of weight or force is applied to a lever of standard length. The resulting leverage is called torque. In our standard system, we use the weight of one pound applied to a lever a foot long, resulting in the unit called a foot- pound. A smaller unit is the inch-pound (the lever is one inch long).

Metric units include the meter kilogram (lever one meter long with a kilogram of weight applied) and the Newton-meter (lever one

meter long with force of one Newton applied). Some conversions are:

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A meter kilogram is about 7.2 foot pounds.
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A foot pound is about 1.4 Newton-meters.
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A centimeter kilogram (cmkg) is equal to .9 inch pounds.

PRESSURE

Pressure is another complicated measurement. Pressure is described as a force or weight applied to a given area. Our common unit is pounds per square inch. Metric units can be expressed in

several ways. One is the kilogram per square centimeter (kg/cm ). Another unit of pressure is the Pascal (force of one Newton on an area of one square meter), which equals about 4 ounces on a square yard. Since this is a very small amount of pressure, we usually see the kiloPascal, or kPa (1000 Pascals). Another common automotive term for pressure is the bar (used by German manufacturers), which equals 10 Pascals. Thoroughly confused? Try the examples below:

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Atmospheric pressure at sea level is about 14.7 psi.
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Atmospheric pressure at sea level is about 1 bar.

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Atmospheric pressure at sea level is about 1 kg/cm .
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One pound per square inch is about 7 kPa.

CONVERSION FACTORS

CONVERSION FACTORS

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TO CONVERT TO MULTIPLY BY

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Millimeters (mm) Inches .03937 Inches Millimeters 25.4 Meters (M) Feet 3.28084 Feet Meters .3048

Kilometers(Km) Miles .62137

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AREA ��

Square Centimeters (cm ) Square Inches .155

Square Inches Square Centimeters 6.45159

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Cubic Centimeters Cubic Inches .06103 Cubic Inches Cubic Centimeters 16.38703 Liters Cubic Inches 61.025 Cubic Inches Liters .01639 Liters Quarts 1.05672 Quarts Liters .94633 Liters Pints 2.11344 Pints Liters .47317 Liters Ounces 33.81497

Ounces Liters .02957

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Grams Ounces .03527 Ounces Grams 28.34953 Kilograms Pounds 2.20462

Pounds Kilograms .45359

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WORK ��

Centimeter Kilograms Inch Pounds .8676 Pounds/Sq. Inch Kilograms/Sq.Centimeter .07031 Bar Pounds/Sq. Inch 14.504

��Pounds/Sq. Inch Bar .06895 Atmosphere Pounds/Sq. Inch 14.696

Pounds/Sq. Inch Atmosphere .06805

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Centigrade Degrees Fahrenheit Degrees (Cx(9)/5)+32

Fahrenheit Degrees Centigrade Degrees (F-32)x(5)/9������������������������������������������������������������������������������������������������������������������������������������

CONVERSION FACTORS (Cont.)

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INCHES DECIMALS mm

��������������������������������������������������������������������������������������������������������������������������������������1/64 ...................... .016 ........................ .397 1/32 ...................... .031 ........................ .794 3/64 ...................... .047 ....................... 1.191 1/16 ...................... .063 ....................... 1.588 5/64 ...................... .078 ....................... 1.984 3/32 ...................... .094 ....................... 2.381 7/64 ...................... .109 ....................... 2.778 1/8 ....................... .125 ....................... 3.175 9/64 ...................... .141 ....................... 3.572 5/32 ...................... .156 ....................... 3.969 11/64 ..................... .172 ....................... 4.366 3/16 ...................... .188 ....................... 4.763 13/64 ..................... .203 ....................... 5.159 7/32 ...................... .219 ....................... 5.556 15/64 ..................... .234 ....................... 5.953 1/4 ....................... .250 ....................... 6.350 17/64 ..................... .266 ....................... 6.747 9/32 ...................... .281 ....................... 7.144 19/64 ..................... .297 ....................... 7.541 5/16 ...................... .313 ....................... 7.938 21/64 ..................... .328 ....................... 8.334 11/32 ..................... .344 ....................... 8.731 23/64 ..................... .359 ....................... 9.128 3/8 ....................... .375 ....................... 9.525 25/64 ..................... .391 ....................... 9.992 13/32 ..................... .406 ...................... 10.319 27/64 ..................... .422 ...................... 10.716 7/16 ...................... .438 ...................... 11.113 29/64 ..................... .453 ...................... 11.509 15/32 ..................... .469 ...................... 11.906 31/64 ..................... .484 ...................... 12.303 1/2 ....................... .500 ...................... 12.700 33/64 ..................... .516 ...................... 13.097 17/32 ..................... .531 ...................... 13.494 35/64 ..................... .547 ...................... 13.891 9/16 ...................... .563 ...................... 14.288 37/64 ..................... .578 ...................... 14.684 19/32 ..................... .594 ...................... 15.081 39/64 ..................... .609 ...................... 15.478 5/8 ....................... .625 ...................... 15.875 41/64 ..................... .641 ...................... 16.272 21/32 ..................... .656 ...................... 16.669 43/64 ..................... .672 ...................... 17.066 11/16 ..................... .687 ...................... 17.463 45/64 ..................... .703 ...................... 17.859 23/32 ..................... .719 ...................... 18.256 47/64 ..................... .734 ...................... 18.653 3/4 ....................... .750 ...................... 19.050 49/64 ..................... .766 ...................... 19.447

25/32 ..................... .781 ...................... 19.844 51/64 ..................... .797 ...................... 20.241 13/16 ..................... .813 ...................... 20.638 53/64 ..................... .828 ...................... 21.034 27/32 ..................... .844 ...................... 21.431 55/64 ..................... .859 ...................... 21.828 7/8 ....................... .875 ...................... 22.225 57/64 ..................... .891 ...................... 22.622 29/32 ..................... .906 ...................... 23.019 59/64 ..................... .922 ...................... 23.416 15/16 ..................... .938 ...................... 23.813 61/64 ..................... .953 ...................... 24.209 31/32 ..................... .969 ...................... 24.606 63/64 ..................... .984 ...................... 25.003

1 ......................... 1.000 ..................... 25.400��������������������������������������������������������������������������������������������������������������������������������������