What does it mean that these bearings are undersize 0.020 inch?

This means the bearings are slightly smaller than standard size by 0.020 inches. This is necessary when the crankshaft journals have been machined down to remove imperfections or wear. Using the correct undersize bearing ensures the proper oil clearance and a snug fit.

What is the primary function of connecting rod bearings?

Connecting rod bearings are a critical engine component that sit between the connecting rod and the crankshaft. Their main job is to reduce friction and wear by allowing the crankshaft to rotate smoothly within the connecting rod, while maintaining a precise oil film.

Are these bearings sold individually or as a set?

This product is a set of connecting rod bearings. Typically, a set includes all the bearings needed for all the connecting rods in your engine, which is usually eight bearings for a four-cylinder engine.

Specifications

Brand: ACL
Part #: 4B1490H-.50

ACL BMW 1.6/1.8/1.9L Z3 Engine Connecting Rod Bearing Set

Name: ACL BMW 1.6/1.8/1.9L Z3 Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-1-6-1-8-1-9l-z3-engine-connecting-rod-bearing-set-t14-631838
Price: 90.21 USD
Availability: BackOrder

$90.21

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Fits 1996-1999 BMW 318ti. ACL connecting rod bearings for 1.6/1.8/1.9L engines. Undersize 0.020 inch.

Key Features

Fits 1996-1999 BMW 318ti, 1996-1998 BMW 318i, 1996-1997 BMW 318is, and 1996-1998 BMW Z3.
Connecting rod bearing set for 1.6, 1.8, and 1.9-liter BMW engines.
Undersize 0.020 inch, suitable for use with a machined crankshaft.
Features ACL's specialized overlay material for reduced friction and wear.
Well-built to withstand engine operating pressures and heat.

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About this part

Product Details

ACL has been making engine bearings for decades, and this connecting rod bearing set for your BMW 318ti is one of their staples. These bearings are crucial for the health of your engine, as they sit between the connecting rod and the crankshaft, reducing friction and wear. This specific set is designed for 1.6, 1.8, and 1.9-liter engines found in various BMW models from the mid-90s.

This set is undersized by 0.020 inches, which is important if you've had your crankshaft machined. Using undersized bearings on a machined crankshaft ensures a proper, snug fit and maintains the correct oil clearance. ACL uses a specialized overlay material that's well-built to handle the pressures and heat generated during engine operation, helping to extend the life of your engine components.

When you're rebuilding or repairing your engine, getting the right bearing size is key. This set is a solid option for ensuring your connecting rods move smoothly against the crankshaft, contributing to overall engine performance and longevity.