What does '0.030 inch undersize' mean for these bearings?

This means the bearings are designed for a crankshaft that has been machined down by 0.030 inches. This is a common practice during engine rebuilds to ensure proper fit and oil clearance when the crankshaft journals are worn or resurfaced.

What is the main function of crankshaft main bearings?

Crankshaft main bearings support the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while maintaining the correct oil clearance, which is crucial for lubrication and preventing metal-on-metal contact.

Are these bearings sold individually or as a set?

This is a complete set of crankshaft main bearings, designed to replace all the main bearings in your engine.

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Trusted Since 1957

Est. 1957

ACL Ford Prod. 4 122-140 1974-90 Engine Crankshaft Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1117A-30

ACL Ford Prod. 4 122-140 1974-90 Engine Crankshaft Main Bearing Set

Name: ACL Ford Prod. 4 122-140 1974-90 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-4-122-140-1974-90-engine-crankshaft-main-bearing-set-t14-631259
Price: 32.56 USD
Availability: BackOrder

$32.56

On Backorder

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 bearings help keep your engine running smoothly.

Key Features

Fits 1979 Ford Mustang.
ACL main bearing set for Ford 4-cylinder engines.
0.030 inch undersize for use with a machined crankshaft.
Multi-layer bearing material with steel backing and bronze-aluminum overlay.

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Fits this vehicle

Ford Mustang 1979

Product Details

When you're rebuilding or refreshing the engine in your 1979 Ford Mustang, the crankshaft main bearings are a critical component. These ACL main bearings are built to handle the demands of your engine, ensuring the crankshaft spins true and oil flows correctly. They are designed as a direct replacement for your original bearings, making installation straightforward during your engine build.

ACL uses a multi-layer bearing material with a steel backing for strength and a bronze-aluminum overlay for smooth operation against the crankshaft. This combination helps manage heat and reduce friction, which is essential for the longevity of your engine. The 0.030 inch undersize specification means these bearings are intended for crankshafts that have been machined down by 0.030 inches during an engine rebuild, ensuring a precise fit and proper oil clearance.