GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2008 🢒 Astra 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Crankshaft and Bearing Cleaning and Inspection

Special Tools

MKM-571-B Dial Gage

Crankshaft End Play, Check

    Object Number: 1948727 Size: SH

    Important: Crankshaft attached with crankshaft bearing covers.

  1. Install the dial gage MKM-571-B .
    2. • Install in the holder on the front of the cylinder block.
    • Place the dial gage plunger against the crankshaft and adjust.
  2. Measure the longitudinal play of the crankshaft.
    3. • Move the crankshaft in the longitudinal direction.
    • Permissible crankshaft end play: 0.100-0.202 mm.
  3. Remove the dial gage MKM-571-B .

Crankshaft Out-of-Round, Check

    Object Number: 1948740 Size: SH

    Important: Crankshaft removed.

  1. Insert the crankshaft in the cylinder block.
  2. Install the dial gage MKM-571-B .
    3. • Attach to the bracket on the cylinder block.
    • Place the dial gage plunger against the crankshaft bearing journal and adjust.
  3. Check the rotational play of the crankshaft.
    4. • Turn the crankshaft evenly.
    • Maximum permissible rotational play: 0.03 mm.
  4. Remove the dial gage MKM-571-B .

Check Crankshaft Bearing Clearance (With Plastigage)

    Object Number: 1936797 Size: SH

    Important: Crankshaft removed.

    Important: Do not rotate the crankshaft.

    Important: Plastigage is available via the "Opel/Vauxhall Workshop Equipment" catalogue.

  1. Lay on Plastigage.

    2. Lay out Plastigage (flexible plastic thread) around the entire width of the con-rod bearing journal (arrow).

    Notice: Refer to Fastener Notice in the Preface section.

    Important: Note the correct tightening sequence.

    Important: The bolts can be reused for checking the crankshaft bearing play.

  2. Install the crankshaft bearing cap.

    3. Tighten
    Tighten the 2 bolts to 50 N·m+45°+15°.

  3. Remove the crankshaft bearing cap.

    4. Unscrew the 2 bolts.

    Important: When reading the value, do not confuse millimeters and inches on the measuring scale.

  4. Measure the crankshaft bearing play.
    5. • Compare the width of the flattened plastic thread (arrow) to the measuring scale.
    • Permissible crankshaft bearing play: 0.005-0.059 mm.

Check Crankshaft Bearing Clearance (With Micrometer Gage Internal Measuring Device)

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1948753 Size: LH

    Important: Note the correct tightening sequence.

    Important: The bolts can be reused for checking the crankshaft bearing play.

  1. Install the crankshaft bearing cap with the crankshaft bearing clips to the cylinder block.

    2. Tighten
    Tighten the 2 bolts to 50 N·m+45°+15°.

  2. Install the inner plunger and calibrate with the micrometer gage  (1).
  3. Measure the crankshaft bearing diameter at 3 points.

    4. Measure at points I, II and III with the internal measuring device.


    Object Number: 1935590 Size: SH
  4. Work the out average crankshaft bearing diameter.

    5. Formula: I + II + III/3.

  5. Measure the crankshaft bearing journal diameter at 2 points.

    6. Measure at points I and II with the micrometer gauge.

  6. Work out the average crankshaft bearing journal diameter.

    7. Formula: I + II/2.

  7. Determine the crankshaft bearing play.

    8. Calculation formula: average crankshaft bearing diameter - average crankshaft bearing journal diameter.

  8. Nominal-Actual comparison.

    9. Permissible crankshaft bearing play: 0.005-0.059 mm.