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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Engine Mechanical - 1.4L (LUV)) >> Repair Instructions - Off Vehicle >> Piston, Connecting Rod, and Bearing Cleaning and Inspection >> Piston And Connecting Rod Measurement Procedure

Piston And Connecting Rod Measurement Procedure

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Piston Ring Clearance

    Fig 1: Measuring Piston Ring End Clearance
    GM2189596Courtesy of GENERAL MOTORS COMPANY
  1. 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 0.4-0.6 mm (0.0157-0.0236 in).
    • The lower compression ring end gap should be 0.4-0.6 mm (0.0157-0.0236 in).
    • The oil ring end gap should be 0.2-0.9 mm (0.0079-0.0354 in).
  2. If the clearance is greater than the provided specifications, the piston rings must be replaced.
    3. Fig 2: Measuring Piston Ring Side Clearance
    GM2189597Courtesy of GENERAL MOTORS COMPANY
  3. Measure the piston ring side clearance as shown (1). Compare the measurements with those provided below:
    • The upper compression ring side clearance should be 0.025-0.07 mm (0.001-0.0028 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 0.04-0.12 mm (0.0016-0.0047 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. Tighten the connecting rod bearing cap bolts in the following sequence:
      CAUTION:

      Refer to Fastener Caution

      NOTE:

      The old bolts can be reused for the measuring procedure.

    1. Tighten the connecting rod bearing cap bolts to 10 N.m (89 lb in).
    2. Tighten the bolts to an additional 60 degrees using EN-470-B  wrench.
    3. Tighten the bolts to an additional 15 degrees using EN-470-B  wrench.
    3. Fig 3: Measuring Connecting Rod Bearing Diameters
    GM2189741Courtesy of GENERAL MOTORS COMPANY
  3. 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. Fig 4: Connecting Rod Journal Diameter Points
    GM2189634Courtesy of GENERAL MOTORS COMPANY
  5. 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 0.013-0.061 mm (0.0005-0.0024 in).

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