1. Clean and check the condition of the crankshaft.
2. Check the wear of the connecting rod and main journals. If the engine has high mileage, or if there is any doubt about the condition of the crankshaft, it is better to consult an Audi dealer or specialist about the need for regrinding. If the bearing shells (and thrust washers, if any) almost new, do not use a new set when installing the crankshaft.
3. If available, Plastigage can be used to check the running clearance of existing bearing shells. A strip of Plastigage is placed across the crankshaft journal and the bearing is then assembled and compressed to the specified tightening torque. After removing the bearing, the strip width is measured according to the table and the operating clearance is determined.
4. On models with a manual transmission, check the condition of the needle bearing at the rear of the crankshaft (photo). To replace it, a special tool is required. Clean out the notch, then insert the new bearing using the metal tube. The printed side of the bearing should face out and the bearing should sit 1.5mm deep.
5. Note that short engines have needle bearing crankshafts. If the engine is to be used with an automatic transmission, the bearing must first be removed to accommodate the torque converter.
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