Chevrolet Trax: Crankshaft and bearing cleaning and inspection

Special Tools

• EN-470-B Angular Torque Wrench
• GE-571-B Dial Gauge

For equivalent regional tools, refer to Special Tools.

Crankshaft End Play, Check

Fig. 358: Gauge Tool

NOTE: Crankshaft attached with crankshaft bearing caps.

1. Install the GE-571-B gauge (1).

• Install the holder on the front of the engine block.
• Place the dial gauge plunger against the crankshaft and adjust.

2. Measure the longitudinal play of the crankshaft.

• Move the crankshaft in the longitudinal direction.
• Permissible crankshaft end play 0.100-0.202 mm (0.0039-0.0080 in).

3. Remove the GE-571-B gauge.

Crankshaft Out-of-Round, Check

Fig. 359: Gauge Tool

NOTE: Crankshaft removed.

1. Insert the crankshaft in the engine block.
2. Install the GE-571-B gauge (1).

• Attach holder to the engine block.
• Place the dial gauge plunger against the crankshaft bearing journal and adjust.

3. Check the rotational play of the crankshaft.

• Turn the crankshaft evenly.
• Maximum permissible rotational play 0.03 mm (0.001 in).

4. Remove the GE-571-B gauge.

Check Crankshaft Bearing Clearance (With Plastigage)

Fig. 360: Plastigage On Bearing Journal

NOTE:

•  Crankshaft removed.
• Do not rotate the crankshaft.

1. Lay out plastigage.

Lay out plastigage (flexible plastic thread) around the entire width of the crankshaft bearing journal (1).

Fig. 361: Crankshaft Bearing Cap Tie Plate

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

2. Install the 4 lower crankshaft bearings (3) and the lower crankshaft thrust bearing (4).
3.  Install the crankshaft bearing cap tie plate (2).
4. Install the 10 inner crankshaft bearing cap tie plate bolts (1).

Fig. 362: Inner Crankshaft Bearing Cap Tie Plate Bolts Tightening Sequence

CAUTION: Refer to Fastener Caution .

5. Tighten the 10 inner crankshaft bearing cap tie plate bolts in a sequence as shown and in the following order:

1. Tighten the inner crankshaft bearing cap tie plate bolts to 25 N.m (18 lb ft).
2. Tighten the inner crankshaft bearing cap tie plate bolts an additional 60º. Use EN-470-B wrench.
3. Tighten the inner crankshaft bearing cap tie plate bolts an additional 15º. Use EN-470-B wrench.

6. Remove the crankshaft bearing cap tie plate bolts and the crankshaft bearing cap tie plate.

Fig. 363: Measuring Crankshaft Bearing Play Using Measuring Scale

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

7. Measure the crankshaft bearing play.

• Compare the width of the flattened plastic thread (arrow) to the measuring scale (1).
• The crankshaft bearing play should be 0.007-0.031 mm (0.00028-0.00122 in).

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

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

1. Install and tighten the crankshaft bearing cap tie plate and the crankshaft bearings as shown above.

Fig. 364: Crankshaft Bearing Diameter Measuring Points

2. Measure the crankshaft bearing diameter at 3 points.

Measure in areas as shown (1) with an internal measuring device.

Calculate the average crankshaft bearing diameter.

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

Fig. 365: Connecting Rod Journal Diameter Points

3. Measure the crankshaft bearing journal diameter at 2 points between (1) and (3) and between (2) and (4) with the micrometer gauge.
4. Calculate the average crankshaft bearing journal diameter.

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

5. Determine the crankshaft bearing play.

Calculation formula: average crankshaft bearing diameter minus average crankshaft bearing journal diameter.

6. The crankshaft bearing play should be 0.007-0.031 mm (0.00028-0.00122 in).

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