A3 Quattro L4-2.0L Turbo (CBFA) (2009)
Crankshaft: Testing and Inspection
Crankshaft, Measuring Radial Play
Crankshaft, Measuring Radial Play
Special tools, testers and auxiliary items required
‹› Plastigage
Procedure
‹› Do not interchange used bearings
‹› Bearing shells that are worn down to the nickel layer must be replaced.
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Remove the main bearing cap, clean the bearing cap and journal.
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Place Plastigage over entire width of bearing journal or into bearing shells.
‹› Plastigage must rest in center of bearing shell.
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Position the main bearing cap and tighten it to 60 Nm. Do not rotate the crankshaft when doing so.
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Remove main bearing cap again.
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Compare width of Plastigage with calibrated scale.
Radial clearance:
‹› New: 0.017 to 0.037 mm.
‹› Wear limit: 0.15 mm.