What does '.25 Oversized' mean for these bearings?

This means the bearings are .25mm smaller in diameter than standard size. They are intended for use when the engine's crankshaft has been machined down by .25mm to correct wear or damage.

What engine sizes does this bearing set fit?

This set is made for BMW's M40B16 (1.6L), M40B18 (1.8L), and M40B19 (1.9L) engines found in specific 3-Series and Z3 models.

Do these bearings come with new main bolts?

This product is for the main bearing set only. It does not include main bearing bolts or other engine hardware. It is recommended to replace main bolts when rebuilding an engine.

ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .25 Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1538H-.25
UPC: 9315726432891

ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .25 Oversized Main Bearing Set

Name: ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .25 Oversized Main Bearing Set
Brand: ACL
Price: 195.96 USD
Availability: InStock

$195.96

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Fits 1996-1999 BMW 318ti. ACL .25mm undersize main bearing set for M40B16/18 engines. Restores proper crankshaft support.

Key Features

Fits 1996-1999 BMW 318ti, 1996-1998 318i, 1996-1997 318is, and 1996-1998 BMW Z3.
Designed for M40B16, M40B18, and M40B19 engines (1.6L, 1.8L, 1.9L).
Main bearing set is .25mm undersize for use with machined crankshafts.
Well-built with multi-layer material construction for reliable crankshaft support.
Helps restore proper oil clearance and crankshaft stability.

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Will this fit your vehicle?

Product Details

When your engine's main bearings are worn, they can't properly support the crankshaft. This ACL main bearing set is .25mm undersize, meaning it's designed to fit crankshafts that have been machined down by .25mm due to wear or damage. This is a common step when rebuilding an engine to bring it back to factory specifications. These bearings are well-built with a multi-layer material construction that offers solid performance and durability for your BMW's M40B16, M40B18, or M40B19 engine.

This set is specifically designed for the 1996-1998 BMW 318i, 1996-1997 318is, 1996-1999 318ti, and 1996-1998 BMW Z3 models equipped with the 1.6L, 1.8L, or 1.9L engine. Ensure your crankshaft has been professionally measured and machined to the correct .25mm undersize before ordering.