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Piston And Connecting Rod Measurement Procedure

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Piston Ring Clearance

  1. GM2189596

    Install the piston rings to the cylinder as shown (1) and measure the piston ring end gap. Compare the measurements with those provided below:

    • The upper compression ring end gap should be 0.25 - 0.4 mm (0.0098 - 0.0158 in).
    • The lower compression ring end gap should be 0.25 - 0.5 mm (0.0098 - 0.0197 in).
    • The oil ring end gap should be 0.25 - 0.75 mm (0.0098 - 0.0295 in).
  2. If the clearance is greater than the provided specifications, the piston rings must be replaced.
  3. GM2189597

    Measure the piston ring side clearance as shown (1). Compare the measurements with those provided below:

    • The upper compression ring side clearance should be 0.04 - 0.08 mm (0.0016 - 0.0032 in).
    • The lower compression ring side clearance should be 0.025 - 0.07 mm (0.001 - 0.0028 in).
    • The oil ring side clearance should be 0.02 - 0.180 mm (0.0008 - 0.0071 in).
  4. If the clearance is greater than the provided specifications, replace the piston rings.
  5. If the clearance is still to great, replace the pistons.

Connecting Rod Bearing Clearance (With Micrometer Gauge Internal Measuring Device)

  1. Install the connecting bearings and the connecting rod bearing caps.
    2. CAUTION:

    Refer to Fastener Caution

    NOTE:

    The old bolts can be reused for the measuring procedure.

  2. Tighten the 2 bolts in two passes using the EN-45059  meter :
    1. First pass tighten to 45 N.m (33 lb ft).
      2. CAUTION:

      Refer to Torque-to-Yield Fastener Caution .

    2. Final pass tighten to an additional 60 degrees.
  3. GM2189741

    Measure the connecting rod bearing diameters at 3 points as shown (1). Use a internal measuring device.

  4. Calculate the average connecting rod inner diameter.

    Formula: 1. result + 2. result + 3. result / 3

  5. GM2189634

    Measure the connecting rod journal diameter at 2 points between (1) and (3) and between (2) and (4). Use a micrometer gauge.

  6. Calculate the average connecting rod journal diameter.

    Formula: 1. result + 2. result / 2.

  7. Substract the average connecting rod journal diameter from the average connecting rod bearing diameter in order to determine the connecting rod bearing clearance.

    The clearance should be 0.018 mm - 0.062 mm (0.0007 - 0.0024 in).

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