What does '.025 Oversized' mean for these bearings?

This means the bearings are manufactured to be 0.025 inches larger in diameter than the standard size. This is necessary when the crankshaft journals have been machined undersize during an engine rebuild to remove wear or imperfections.

Are these bearings suitable for a stock engine rebuild?

These bearings are specifically .025 oversize. If your crankshaft journals are still at standard size, you would need a standard size bearing set. These are intended for engines where the crankshaft has been machined undersize.

What is the importance of proper oil clearance with main bearings?

Proper oil clearance is critical for engine health. It allows a thin film of oil to lubricate the crankshaft and bearing surfaces, reducing friction and wear. Too little clearance can lead to seizure, while too much can cause excessive noise and premature wear.

ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .025 Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1538H-.025
UPC: 9315726432877

ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .025 Oversized Main Bearing Set

Name: ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .025 Oversized Main Bearing Set
Brand: ACL
SKU: acl-acl-bmw-m40b16-18-1-6l-1-8l-1-9l-025-oversized-main-bearing-set-t14-361896
Price: 231.46 USD
Availability: BackOrder

$231.46

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 .025 oversize main bearing set for M40B16/18 engines. Essential for engine rebuilds.

Key Features

Fits 1996-1999 BMW 318i, 318is, 318ti, and Z3.
Main bearing set is .025 inch oversize.
Designed for BMW M40B16, M40B18, and M40B19 engines (1.6L, 1.8L, 1.9L).
Essential for engine rebuilds where crankshaft journals have been machined undersize.
Ensures proper oil clearance for engine longevity.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this .025 oversize main bearing set for your BMW M40B16/18 engine is one of their staples. If you're rebuilding your 1.6L, 1.8L, or 1.9L engine, these bearings are a critical component to ensure proper crankshaft support and oil clearance. They are designed to fit your 1996-1998 BMW 318i, 1996-1997 318is, 1996-1999 318ti, or 1996-1998 BMW Z3.

This set is .025 inches (or 0.635mm) larger than standard size. This is important if your crankshaft journals have been machined undersize during a rebuild to clean up wear or damage. Using the correct oversize bearing ensures you achieve the proper oil clearance, which is vital for engine longevity and performance. ACL uses well-built materials and manufacturing processes to create bearings that can handle the demands of an engine rebuild.

When installing these bearings, it's crucial to follow the manufacturer's specifications for oil clearance and torque settings. Always ensure the crankshaft journals are clean and properly prepped before installation. This set is designed as a direct fit replacement for the specified BMW models.