What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.25mm (approximately 0.010 inches). This allows for proper oil clearance and fit when rebuilding an engine with a resurfaced crankshaft.

What is the bimetal construction with an aluminum silicon base?

This construction uses a strong steel backing for structural integrity, with a bearing surface made from an aluminum alloy that includes silicon. This combination offers good wear resistance and conformability to the crankshaft surface, helping to maintain an oil film.

Do these bearings come with installation instructions?

While these bearings are designed as a direct replacement, it is always recommended to consult your vehicle's specific service manual for detailed installation procedures, torque specifications, and any necessary assembly lubricants.

Specifications

Brand: King Engine Bearings
Part #: MB5590SI0.25
UPC: 611500424489

King Engine Bearings General Motors L40/Ld2/Lf0 2.3L (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings General Motors L40/Ld2/Lf0 2.3L (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-l40-ld2-lf0-2-3l-size-0-t14-770872
Price: 62.36 USD
Availability: BackOrder

$62.36

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King Engine Bearings main bearing set for GM 2.3L engines. Size +0.25mm. A well-built replacement for engine rebuilds.

Key Features

Fits a wide range of GM 2.3L L40, LD2, and LF0 engines.
Main bearing set is sized +0.25mm for use with machined crankshafts.
Constructed with a bimetal design using an aluminum silicon base.
Designed for proper oil clearance and crankshaft support during engine operation.

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About this part

Product Details

If you're rebuilding the engine in your GM vehicle, getting the main bearings right is crucial for smooth operation and longevity. This main bearing set from King Engine Bearings is designed for GM L40, LD2, and LF0 2.3L engines, covering a range of popular models like the Buick Skylark, Chevrolet Cavalier, and Pontiac Grand Am.

These bearings are constructed with a bimetal design, featuring an aluminum silicon base. This construction helps them handle the stresses of engine operation while maintaining good contact with the crankshaft. This set is sized at +0.25mm, which is important if you're machining your crankshaft to that specific size during an engine overhaul. Using the correct bearing size ensures proper oil clearance, which is key to preventing premature wear.

When you're putting an engine back together, using well-made components like these King bearings can make a noticeable difference in how the rebuild performs and lasts. Always refer to your vehicle's service manual for specific installation procedures and torque specifications.