What is the purpose of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They create a low-friction surface for the crankshaft to rotate on, ensuring smooth operation and proper oil clearance. A healthy set of main bearings is critical for engine longevity, especially during rebuilds.

Why is the size noted as 0.025 inches undersize?

This indicates the bearings are designed to be used with a crankshaft that has been machined down by 0.025 inches. This is a common practice during engine rebuilding to correct wear or out-of-round conditions on the crankshaft journals.

What other parts are typically needed when replacing main bearings?

When replacing main bearings, it's common practice to also replace rod bearings, piston rings, and engine seals. You'll also need assembly lube to properly coat the bearings before installation, and it's recommended to check crankshaft straightness and journal condition.

Specifications

Brand: ACL
Part #: 5M2220A-.25

ACL Chrysler Prod V8 345 (5.7L Hemi) 2003 on Engine Crankshaft Main Bearing Set

Name: ACL Chrysler Prod V8 345 (5.7L Hemi) 2003 on Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-chrysler-prod-v8-345-5-7l-hemi-2003-on-engine-crankshaft-main-bearing-se-t14-630505
Price: 42.32 USD
Availability: BackOrder

$42.32

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Fits 2015-2023 Dodge Challenger. ACL main bearing set for 5.7L Hemi engines. Essential for engine rebuilds.

Key Features

Fits 2015-2023 Dodge Challenger, 2006-2010 Dodge Charger, 2003-2008 Dodge Ram 1500, and 2021-2024 Ram 1500.
Designed for Chrysler V8 345 (5.7L Hemi) engines.
This is a 0.025 inch undersize main bearing set.
ACL is a well-known manufacturer of engine bearings.
Essential component for engine rebuilds and repairs.

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About this part

Product Details

You get a full set of main bearings in this kit, which means one box handles the critical bottom-end rebuild for your 5.7L Hemi engine. These bearings are what the crankshaft rides on, so having a well-built set is key to a healthy engine, especially if you're rebuilding or replacing worn components. This ACL set is made to fit your specific application, ensuring proper oil clearance and smooth operation.

ACL has been making engine bearings for a long time, and this set is built to meet the demands of the 5.7L Hemi. They're designed to provide the right amount of support for the crankshaft, helping to reduce friction and wear. When you're putting an engine back together, getting the bearing clearances right is crucial, and using a set like this from a reputable brand helps ensure you're on the right track. This particular set is 0.025 inches undersize, which is important to note if you're machining your crankshaft.