What does it mean that these bearings are 0.75mm undersize?

An undersize bearing, like this 0.75mm set, is used when the crankshaft journals have been ground down to a smaller diameter. This is a common practice during engine rebuilding to clean up worn or damaged journals. You must match the bearing size to the crankshaft journal size for proper oil clearance.

What vehicles does this main bearing set fit?

This ACL main bearing set is designed for 1985-1989 Chevrolet Celebrity, 1995-1999 Chevrolet Lumina, and 2000-2005 Chevrolet Monte Carlo models equipped with the 2.8L, 3.1L, or 3.4L V6 engine.

Do I need any special tools to install main bearings?

Installing main bearings typically requires engine disassembly, including removing the crankshaft. You'll need tools to measure crankshaft journals and bearing clearances, such as a micrometer and Plastigage. Always refer to the manufacturer's service manual for the correct procedures and specifications.

Specifications

Brand: ACL
Part #: 4M2037A-.75

ACL Chevrolet V6 173-191-207 1985-04 Engine Crankshaft Main Bearing Set

Name: ACL Chevrolet V6 173-191-207 1985-04 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v6-173-191-207-1985-04-engine-crankshaft-main-bearing-set-t14-631247
Price: 28.28 USD
Availability: BackOrder

$28.28

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Fits 1985-2005 Chevy V6 engines. ACL main bearing set for improved engine reliability.

Key Features

Fits 1985-2005 Chevrolet Celebrity, Lumina, and Monte Carlo V6 engines.
Designed for 2.8L, 3.1L, and 3.4L V6 engines with VIN 7, W, X, Z, D, J, M, or T.
This is a 0.75mm undersize main bearing set, intended for use with a machined crankshaft.
ACL is a well-known manufacturer of engine bearings.
Direct replacement for original equipment main bearings.

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About this part

Product Details

When you're rebuilding or refreshing a Chevrolet V6 engine, especially those 2.8L, 3.1L, or 3.4L models found in vehicles like the Celebrity, Lumina, and Monte Carlo, the crankshaft main bearings are critical. These ACL main bearing sets are built to handle the demands of your engine, ensuring smooth rotation of the crankshaft. They are designed to be a direct replacement for your original bearings, fitting right into place during your engine build.

ACL has been making engine bearings for a long time, and this set is a solid option for anyone looking to get their engine back in reliable running condition. They're made with materials that stand up to the constant friction and heat inside your engine. This particular set is undersized by 0.75mm, which is important to note if you're working with a crankshaft that has been machined or ground down to match this size. Using the correct bearing size is key for proper oil clearance and long engine life.

When installing these bearings, remember to check your crankshaft for any imperfections and ensure the oil passages are clear. Proper oil clearance is essential for the longevity of your engine, so make sure to follow the manufacturer's recommended clearances for your specific application.