What does it mean that these bearings are 0.25mm undersize?

This means the bearing's inner diameter is 0.25mm smaller than a standard size bearing. This is typically used when the engine's crankshaft has been machined down to a smaller size during an engine rebuild to correct wear or damage.

Are these bearings sold individually or as a set?

This is a set of connecting rod bearings. You will receive enough bearings to replace all connecting rod bearings on your engine.

What is the most important factor when installing these bearings?

Proper installation is critical. Always consult your vehicle's specific service manual for correct procedures, including proper cleaning of all components and torque specifications for the connecting rod bolts.

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Est. 1957

Specifications

Brand: ACL
Part #: 4B1490H-.25

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-t14-631442
Price: 90.21 USD
Availability: BackOrder

$90.21

On Backorder

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

Fits 1996-1999 BMW 318ti. ACL 1.6/1.8/1.9L connecting rod bearing set. These are 0.25mm undersize for engine rebuilds.

Key Features

Fits 1996-1999 BMW 318ti, 1996-1998 318i, 1996-1997 318is, and 1996-1998 BMW Z3.
Set of connecting rod bearings for 1.6L, 1.8L, and 1.9L engines.
Bearings are 0.25mm undersize, suitable for use with a machined crankshaft.
ACL is a well-known manufacturer of engine bearings.
Manufactured to precise tolerances for proper oil clearance.

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About this part

Product Details

Already running a rebuilt or performance engine? This set of ACL connecting rod bearings is the next piece of the puzzle for your 1996-1999 BMW 318ti, 1996-1998 318i, 1996-1997 318is, or 1996-1998 BMW Z3. These bearings are crucial for proper engine function, providing a low-friction surface between the crankshaft and connecting rods. They help manage the immense forces generated during combustion, ensuring smooth operation and preventing damage to critical engine components.

ACL has been making engine bearings for a long time, and this set is well-built for the job. They are manufactured to precise tolerances, which is important because even a small variation can affect oil clearance and engine health. This particular set is 0.25mm undersize, which is common when rebuilding an engine with a crankshaft that has been machined down to a smaller size. Proper installation is key; always refer to your vehicle's service manual for the correct procedures and torque specifications.