What does 'undersize' mean for these bearings?

Undersize bearings are made slightly smaller than standard size. This is necessary when the crankshaft journals have been machined down (ground) during an engine rebuild to remove wear or damage. These bearings ensure the correct oil clearance is maintained after machining.

What is the purpose of main bearings?

Main bearings support the crankshaft in the engine block. They create a smooth, low-friction surface that allows the crankshaft to rotate freely while maintaining the precise oil clearance needed for lubrication and to prevent metal-on-metal contact.

Do I need to buy anything else with these bearings?

Yes, when installing main bearings, it is highly recommended to also purchase and install new main bearing cap bolts and use a quality assembly lube. Always refer to your vehicle's service manual for specific installation procedures and torque specifications.

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Specifications

Brand: ACL
Part #: 5M1743A-.50

ACL Ford Prod. 4 140 1989-97 Engine Crankshaft Main Bearing Set

Name: ACL Ford Prod. 4 140 1989-97 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-4-140-1989-97-engine-crankshaft-main-bearing-set-t14-630950
Price: 28.16 USD
Availability: BackOrder

$28.16

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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 1979 Ford Mustang. ACL crankshaft main bearing set, undersize 0.020 inch, for improved oil clearance.

Key Features

Fits 1979 Ford Mustang.
ACL main bearing set for Ford 4-cylinder engines.
This is an undersize bearing set, machined 0.020 inches smaller than standard.
Designed to provide proper oil clearance for a machined crankshaft.
Well-built to support the crankshaft and ensure proper lubrication.

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About this part

Product Details

200,000 psi tensile strength puts these ACL main bearing sets well above stock hardware. If you're rebuilding a 1979 Ford Mustang engine, especially if you've already had the crankshaft ground down, this set is what you need. These bearings are designed to provide the correct oil clearance when the crankshaft journals have been machined undersize, which is common during an engine rebuild to clean up wear or damage.

ACL has been making engine bearings for a long time, and they know what it takes to keep an engine running smoothly. This set is built to handle the demands of your Mustang's engine, ensuring proper lubrication and support for the crankshaft. Because these are an undersize bearing, they are specifically meant to be used with a crankshaft that has been machined down by 0.020 inches. Using the correct undersize bearing is critical for achieving the proper oil clearance, which is essential for engine longevity and performance.