What is the difference between standard and undersize bearings?

Standard bearings are designed to fit an engine with a crankshaft that is within factory specifications. Undersize bearings (like -010 or -020) are used when the crankshaft has been machined undersize to remove damage or wear.

What else might I need to replace when installing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings, oil pump, and oil pan gasket. You'll also need to ensure the crankshaft is clean and within specification before installation.

How do I know if my engine needs main bearings?

Symptoms of worn main bearings include knocking or rumbling noises from the engine, especially under load, and a drop in oil pressure, particularly at idle or when the engine is hot.

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Specifications

Brand: ACL
Part #: 4M2021P-STD

ACL Buick V6 231 1994 Engine Crankshaft Main Bearing Set

Name: ACL Buick V6 231 1994 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-buick-v6-231-1994-engine-crankshaft-main-bearing-set-t14-633187
Price: 42.16 USD
Availability: BackOrder

$42.16

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1994 Buick LeSabre. ACL Crankshaft Main Bearing Set for Buick V6 231. Restores proper oil clearance and engine performance.

Key Features

Fits 1994 Buick LeSabre and 1994 Pontiac Bonneville.
Restores proper crankshaft to block oil clearance.
Helps eliminate engine knocking noises.
Restores and maintains proper engine oil pressure.
Standard size bearings for a precise fit.
Well-built material for durability.

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About this part

Product Details

When your engine's main bearings wear out, they create extra space between the crankshaft and the engine block. This extra space is what causes those tell-tale knocking sounds and allows oil pressure to drop. This set from ACL is built to the original equipment specifications, meaning they'll fit right in and restore the correct oil clearance. They're made from a well-built material designed to handle the pressures and temperatures inside your engine, helping to ensure a long service life.

This set includes the main bearings for your 1994 Buick LeSabre or Pontiac Bonneville. Make sure you have the correct tools and service manual on hand before you begin the installation, as this job involves removing the crankshaft.