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Home >> Suzuki >> 1990 >> Swift GLX >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (1.0L 3-CYL - VIN [5] & 1.0L 3-CYL Turbo - VIN [2]) >> Overhaul >> Main Bearings >> Standard Bearing

Standard Bearing

WARNING: This page is about a different car, the 1987 Chevrolet Sprint. However, it is still accessible from the selected car via links, so may be relevant.
  1. If bearings are damaged or exceed specifications, select a new standard bearing using the following procedure. Locate 4 numbers stamped on crankshaft counterweight of cylinder No. 1.
  2. The first number (left) indicates journal diameter at No. 1 bearing cap. The second number indicates journal diameter at No. 2 bearing cap. The third number indicates journal diameter at No. 3 bearing cap. The fourth number indicates journal diameter at No. 4 bearing cap. See Fig 1.
    Fig 1: Location of Stamped Numbers on Counterweights
    G80629Courtesy of GENERAL MOTORS CORP.
    CRANKSHAFT JOURNAL DIAMETER (1)

    Stamped Number Journal Diameter: In. (mm)
    1 1.7714-1.7716 (44.994-45.000)
    2 1.7712-1.7714 (44.988-44.994)
    3 1.7710-1.7712 (44.982-44.988)
    (1) This table only applies to standard crankshafts.
  3. Measure bearing cap bore diameter without bearing installed. There are 4 letters stamped on oil pan mating surface of cylinder block indicating cap bore diameter.
  4. Reading from left-to-right, first letter applies to cap No. 1, second letter applies to No. 2 cap, third letter applies to No. 3 cap and fourth letter applies to No. 4 cap. See CRANKSHAFT BEARING JOURNAL BORE  table.
    CRANKSHAFT BEARING JOURNAL BORE

    Letter (1) Cap Diameter: In. (mm)
    A 1.9292-1.9294 (49.002-49.007)
    B 1.9294-1.9296 (49.007-49.012)
    C 1.9296-1.9298 (49.012-49.017)
    (1) Letters only INDICATE cap diameter. Diameter must be measured.
    STANDARD BEARING SELECTION

    Letter 1 2 3
    A Green Black No Paint
    B Black No Paint Yellow
    C No Paint Yellow Blue
    Fig 2: Location of Stamped Letters on Cylinder Block
    G80051Courtesy of GENERAL MOTORS CORP.
    NOTE: There are 5 sizes of standard bearings. Paint marks are applied for identification purposes. Each color indicates thickness at center of bearing.
  5. From numbers stamped on crankshaft counterweights of cylinder No. 1 and letters stamped on oil pan mating surface, determine new standard size bearing to be installed on each journal.
  6. Use Plastigage method to measure main bearing clearance. If clearance still exceeds specifications, use next size thicker bearing and remeasure. When replacing crankshaft or cylinder block for any reason, select new standard bearings by referring to numbers and letters.
MAIN BEARING IDENTIFICATION

Color Code Bearing Thickness: In. (mm)
Green .0786-.0787 (1.996-2.000)
Black .0787-.0788 (2.000-2.002)
No Paint .0788-.0789 (2.002-2.004)
Yellow .0789-.0790 (2.004-2.007)
Blue .0790-.0791 (2.007-2.009)
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