What does '0.025 inch undersize' mean for these bearings?

This means the inner diameter of the bearing is 0.025 inches larger than a standard size bearing. This is necessary when the crankshaft journals have been machined down by 0.025 inches to correct for wear or to achieve a specific build tolerance.

Are these bearings suitable for a stock engine rebuild?

These are considered high-performance bearings and are specifically sized at 0.025 inch undersize. They are best suited for engines where the crankshaft has been machined to match this undersize, often as part of a performance build or a repair involving crankshaft grinding.

What other parts are typically replaced when installing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings (also known as rod bearings) and the crankshaft itself if it's severely damaged or worn beyond repair. Always consult your vehicle's service manual for specific recommendations.

1982-1989 Nissan Stanza Main Bearings | ACL 5M1633H-.025

Name: ACL Nissan CA18/C20 0.025 Oversized High Performance Main Bearing Set
Brand: ACL
Price: 103.17 USD
Availability: InStock

ACL Nissan CA18/C20 0.025 Oversized High Performance Main Bearing Set

$103.17

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

Fits 1982-1989 Nissan Stanza. ACL 0.025 inch undersize main bearing set for high performance applications.

Key Features

Fits 1982-1989 Nissan Stanza, 1984-1988 Nissan 200SX, 1988-1989 Nissan Pulsar NX, and 1983-1986 Nissan Sentra.
Main bearing set designed for Nissan CA18 and C20 engines.
Bearings are 0.025 inches undersize, intended for use with a machined crankshaft.
High-performance construction suitable for demanding engine builds.
Ensures proper crankshaft support and oil clearance.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this high-performance main bearing set for your Nissan Stanza is one of their staples. These bearings are designed for the CA18 and C20 engines, and they come 0.025 inches undersize, which is crucial if you've had your crankshaft machined to a larger size. Proper main bearings are essential for keeping your crankshaft supported and aligned within the engine block, ensuring smooth operation and preventing premature wear.

This set is built with performance in mind, using materials and construction techniques that can handle the demands of a well-tuned engine. When you're rebuilding or upgrading your Nissan's engine, using bearings that are precisely sized and well-made is key to a long-lasting and reliable build. The 0.025 inch undersize means these are intended for use with a crankshaft that has been ground down by that amount to correct for wear or to achieve a specific build tolerance.

If you've already had your crankshaft measured and machined to be 0.025 inches smaller in diameter, this ACL bearing set is the correct choice to ensure a proper fit and optimal oil clearance. Always refer to your engine's specific service manual for detailed installation instructions and recommended oil clearances.