What does the '+1.0mm' sizing mean for these bearings?

The '+1.0mm' designation means these bearings are 1.0mm larger in diameter than standard size. This indicates they are intended for use when the engine's crankshaft journals have been machined down by 1.0mm during an overhaul or repair.

What is the construction material of these main bearings?

These main bearings are constructed with a bimetal design, utilizing an aluminum silicon base. This material combination is chosen for its good wear characteristics and ability to maintain an effective oil film between the bearing and the crankshaft.

Are these bearings a direct replacement for all 2.3L GM engines?

These bearings are specifically designed for GM engines with the L40, LD2, and LF0 engine codes, all of which are 2.3L displacements. While they fit a range of vehicles, it's important to confirm your specific engine code to ensure compatibility.

Specifications

Brand: King Engine Bearings
Part #: MB5590SI1.0
UPC: 611500474064

King Engine Bearings General Motors L40/Ld2/Lf0 2.3L (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings General Motors L40/Ld2/Lf0 2.3L (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-l40-ld2-lf0-2-3l-size-1-t14-770875
Price: 62.36 USD
Availability: BackOrder

$62.36

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King Engine Bearings main bearing set for GM L40, LD2, LF0 2.3L engines. Size +1.0mm.

Key Features

Fits Buick Skylark (1988-1995), Chevrolet Beretta (1990-1994), Chevrolet Cavalier (1995), Oldsmobile Achieva (1992-1995), Oldsmobile Calais (1987), Oldsmobile Cutlass Calais (1988-1991), Oldsmobile Cutlass Supreme (1990-1991), Pontiac Grand Am (1988-1995), Pontiac Grand Prix (1990-1991), and Pontiac Sunfire (1995).
Main bearing set for General Motors L40, LD2, and LF0 2.3L engines.
Features a bimetal construction with an aluminum silicon base for improved wear resistance.
Bearings are sized +1.0mm, intended for use with a crankshaft machined undersize by 1.0mm.

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About this part

Product Details

If you're rebuilding the bottom end of your General Motors L40, LD2, or LF0 2.3L engine, a solid set of main bearings is crucial for smooth operation and longevity. This set from King Engine Bearings is built with a bimetal construction, using an aluminum silicon base. This material choice helps ensure good wear characteristics and proper oil film support.

These bearings are sized at +1.0mm, meaning they are intended for use when the crankshaft journals have been machined down by 1.0mm. This is a common practice during engine overhauls to clean up worn or damaged surfaces. King Engine Bearings is a well-known name in the engine component world, and this set is designed to fit a range of vehicles including the Buick Skylark, Chevrolet Cavalier, and Pontiac Grand Am.