Crankshaft — checks (Opel Omega B2)

Checking the axial displacement of the crankshaft

1. Attach the holder with the MKM-571-V pointer indicator to the cylinder block, the contact pin of which should rest against the end of the shaft secured in the block with bearings (see illustration).



2. Move the crankshaft in the longitudinal direction. The maximum permissible axial displacement of the crankshaft should be within 0.01-0.02 mm.

Checking the crankshaft runout

3. Unscrew the main bearing cap mounting bolts and remove the caps.

4. Attach the holder with the MKM-571-V pointer indicator to the cylinder block, the contact pin of which should rest against the end of the shaft (see illustration 11.1).

5. Turn the crankshaft and read the dial indicator. Check the runout of the crankshaft journal surfaces in the same way (see illustration).



Permissible ovality value 0.03 mm. Clearance between the liners and the journals of the main bearings of the crankshaft. Measurement using a calibrated plastic wire "Plastigage"



The clearance between the liners and the journals of the crankshaft main bearings is checked by calculation, measuring the parts. Before this, the crankshaft and its journals are cleaned, and the liners are lubricated with a thin layer of motor oil.

Typically, a calibrated plastic wire is used to check the gap.

6. Clean the working surface of the liners and the corresponding neck and place a piece of plastic wire on its surface (see illustration).



7. Install the main bearing cap onto the journal being checked and tighten the mounting bolts to the specified torque.

8. Unscrew the bolts and remove the bearing cover, then use the scale on the plastic wire package to determine the gap size by flattening the wire (see illustration). The permissible gap between the liners and covers is 0.016-0.069 mm.

Measuring the clearance of connecting rod bearings using a bore gauge

In this case, the clearance between the connecting rod bearing liners is determined by measuring the bearing diameter with a bore gauge at three points. The results obtained are summed up and divided by 3. The result is the average diameter value (see illustration 11.8a).

Example:

I - the result obtained when measuring at point I - 54.972 mm
II - the result obtained when measuring at point II - 54.981 mm
III - the result obtained when measuring at point III - 54.984 mm
164.937 mm: 3 = 54.979 mm

9. Measure the diameter of the corresponding crankpin at two points using a micrometer, add up the obtained values and divide them by 2.

Example:

I - the result obtained when measuring at point I - 54.962 mm
II - the result obtained when measuring at point II - 54.964 mm
109.926 mm: 2 = 54.963 mm