What does the +0.5mm size mean for these bearings?

The +0.5mm designation indicates that these bearings are slightly larger than standard size. This is used when the crankshaft journals have been machined down by 0.5mm to remove imperfections or to prepare for new bearings. It's essential to match the bearing size to the crankshaft journal size for correct oil clearance.

What is the tri-metal construction?

Tri-metal bearings have three layers: a steel backing for strength, a middle layer of copper-lead alloy for load carrying, and a soft babbit overlay for conformability and embeddability. This construction offers a good balance of strength and wear resistance for many engine applications.

Are these bearings sold individually or as a set?

This product is sold as a complete set of 5 crankshaft main bearings, which is the quantity needed for a full engine installation on the BMW M3.

Specifications

Brand: King Engine Bearings
Part #: MB5803CA0.5
UPC: 611500598388

King Engine Bearings BMW S65B40A (Size +0.5mm) Crankshaft Main Bearing ( Set of 5 )

Name: King Engine Bearings BMW S65B40A (Size +0.5mm) Crankshaft Main Bearing ( Set of 5 )
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-s65b40a-size-0-5mm-crankshaft-main-t14-208035
Price: 228.70 USD
Availability: BackOrder

$228.70

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Fits 2008-2013 BMW M3. King Engine Bearings crankshaft main bearing set (+0.5mm size) for the S65B40A engine. Essential for engine rebuilds.

Key Features

Fits 2008-2013 BMW M3.
Set includes 5 crankshaft main bearings.
Bearing size is +0.5mm, intended for machined crankshafts.
Constructed with a tri-metal copper-based material.
Features King's Tri-M+ enhanced babbit overlay.
Suitable for medium-load engines like the BMW S65B40A.

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About this part

Product Details

If you're rebuilding the engine in your 2008-2013 BMW M3, you'll want to pay close attention to the crankshaft main bearings. This set from King Engine Bearings is specifically made for the S65B40A engine and comes in a +0.5mm size, which is crucial if your crankshaft journals have been machined to this specification during a rebuild. King has been specializing in bearings since 1960, focusing on supplying well-built engine bearings.

These main bearings are constructed with a tri-metal copper-based material and feature King's Tri-M+ enhanced babbit overlay. This combination is well-suited for medium-load engines like the high-revving V8 found in the M3. Using the correct bearing size is critical for proper oil clearance, which ensures the crankshaft spins smoothly and receives adequate lubrication, preventing premature wear.