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Piston and Connecting Rod Measurement Procedure Buick Encore I

Mechanical ~342 words

Piston Ring Clearance

  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. 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»(ref-614550-S30742088082014050700000) NOTE: The old bolts can be reused for the measuring procedure. Tighten the connecting rod bearing cap bolts to 10 N.m (89 lb in). Tighten the bolts to an additional 60 degrees using EN-470-B wrench. Tighten the bolts to an additional 15 degrees using EN-470-B wrench.
  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. 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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