What does 0.50mm oversize mean for these bearings?

This means the bearings are designed to fit a crankshaft that has been machined down by 0.50mm. This is a common practice when rebuilding an engine to correct wear or damage on the crankshaft journals.

What vehicles does this specific main bearing set fit?

This set is designed for Audi A4 models from 1997-1999 and 2002-2005, Audi A6 models from 1998-1999 and 2002-2004, and Volkswagen Passat models from 1998-2000. It is specifically for the ACZ, AAH, ACK, AEJ, and ASN engine codes.

What is the construction material of these bearings?

These main bearings are made with a bimetal construction, utilizing an aluminum silicon base. This material composition is chosen for its performance characteristics in engine bearing applications.

Specifications

Brand: King Engine Bearings
Part #: MB4073SI0.5
UPC: 611500471865

King Engine Bearings Audi Acz/Aah/Ack. Aej/Asn (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Audi Acz/Aah/Ack. Aej/Asn (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-audi-acz-aah-ack-aej-asn-size-0-50mm-m-t14-770345
Price: 116.15 USD
Availability: BackOrder

$116.15

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Fits 1997-2005 Audi A4. King Engine Bearings main bearing set, 0.50mm oversize, for ACZ/AAH/ACK/AEJ/ASN engines.

Key Features

Fits 1997-2005 Audi A4, 1998-1999 & 2002-2004 Audi A6, and 1998-2000 Volkswagen Passat.
Main bearing set for Audi ACZ, AAH, ACK, AEJ, and ASN engines.
Bearings are 0.50mm oversize, intended for use with a machined crankshaft.
Constructed with a bimetal design featuring an aluminum silicon base.
Designed to provide proper oil clearance for crankshaft rotation.

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About this part

Product Details

King Engine Bearings is known for making well-built engine components, and this main bearing set is no exception. If you're rebuilding the bottom end of your Audi ACZ, AAH, ACK, AEJ, or ASN engine, these bearings are designed to fit right into your 1997-1999 or 2002-2005 Audi A4, or compatible A6 and Volkswagen Passat models. They are a 0.50mm oversize set, meaning they are intended for crankshafts that have been machined down by that amount to correct wear or damage.

These main bearings feature a bimetal construction with an aluminum silicon base. This type of material is chosen for its ability to handle the loads and temperatures found in the main bearing journals, helping to ensure smooth rotation of your crankshaft. Using the correct size bearings, especially when dealing with a machined crankshaft, is crucial for proper oil clearance and long engine life.