What does 'standard size' mean for these bearings?

Standard size bearings are designed to fit a crankshaft that is within the manufacturer's original factory specifications. If your crankshaft journals have been machined undersize due to wear or previous repairs, you will need to order the appropriate undersize bearings.

What is the construction of these ACL bearings?

These bearings feature a multi-layer construction. They have a strong steel backing for structural integrity, a bronze-aluminum overlay for excellent wear resistance, and a thin overlay plating to aid in the initial break-in process.

Do these bearings come with installation instructions?

While these bearings are designed as a direct replacement, it is always recommended to refer to the manufacturer's official service manual for detailed installation procedures, torque specifications, and proper break-in guidelines.

Specifications

Brand: ACL
Part #: 4B1568HX-STD

ACL BMW M3 E30 S14B20/23/25 2.0/2.3/2.5L INLINE4 Engine Connecting Rod Bearing Set

Name: ACL BMW M3 E30 S14B20/23/25 2.0/2.3/2.5L INLINE4 Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-m3-e30-s14b20-23-25-2-0-2-3-2-5l-inline4-engine-connecting-rod-beari-t14-631841
Price: 120.90 USD
Availability: BackOrder

$120.90

On Backorder

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

Fits 1988-1991 BMW M3. ACL standard connecting rod bearings for your S14 engine. Essential for engine health and performance.

Key Features

Fits 1988-1991 BMW M3.
Standard size connecting rod bearings.
Designed for the BMW S14B20, S14B23, and S14B25 inline-4 engines.
Multi-layer construction with steel backing and bronze-aluminum overlay.
Helps maintain proper oil clearance and reduce friction.

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About this part

Product Details

You get a full set of connecting rod bearings in this kit, which means one box handles the whole engine rebuild or repair. These are standard size bearings from ACL, designed specifically for the S14 engine found in the 1988-1991 BMW M3. Proper bearing clearance is crucial for oil flow and to prevent metal-on-metal contact, which is key to keeping your engine running smoothly and preventing catastrophic failure.

ACL has been making engine bearings for a long time, and these are well-built for the job. They use a multi-layer construction with a steel backing for strength, a bronze-aluminum overlay for wear resistance, and a thin overlay plating for initial break-in. This design helps maintain consistent oil pressure and reduces friction between the crankshaft and connecting rod, which is especially important when you're pushing your M3 hard.

When you're rebuilding or repairing your S14 engine, using the correct size bearings is critical. These are standard size, meaning they're meant to be used with a crankshaft that's within factory specifications. If your crankshaft has been ground undersize due to wear or previous repairs, you'll need to order the corresponding undersize bearings. Always check your crankshaft journals for size and straightness before ordering bearings.