29. Crankshaft and Bearing Cleaning and Inspection

Crankshaft and Bearing Cleaning and Inspection

Special Tools

MKM-571-B Dial Gage


Crankshaft End Play, Check






Important: Crankshaft attached with crankshaft bearing covers.


1. Install the dial gage MKM-571-B .

* 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.

* 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






Important: Crankshaft removed.


1. Insert the crankshaft in the cylinder block.
2. Install the dial gage MKM-571-B .

* 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.

* 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)






Important: Crankshaft removed.



Important: Do not rotate the crankshaft.



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


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

Notice: Refer to Fastener Notice (Fastener Notice) .


Important: Note the correct tightening sequence.



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


2. Install the crankshaft bearing cap.

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

3. Remove the crankshaft bearing cap.
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.

* 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 (Fastener Notice) .


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.

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




4. Work the out average crankshaft bearing diameter.
Formula: I + II + III/3.
5. Measure the crankshaft bearing journal diameter at 2 points.
Measure at points I and II with the micrometer gauge.
6. Work out the average crankshaft bearing journal diameter.
Formula: I + II/2.
7. Determine the crankshaft bearing play.
Calculation formula: average crankshaft bearing diameter - average crankshaft bearing journal diameter.
8. Nominal-Actual comparison.
Permissible crankshaft bearing play: 0.005-0.059 mm.