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 a precise oil clearance, which is essential for proper lubrication and oil pressure.

What signs indicate my main bearings need replacing?

Symptoms of worn main bearings often include a drop in oil pressure, especially at idle or when the engine is warm. You might also hear a deep knocking or rumbling sound coming from the bottom of the engine, which gets louder with RPMs.

Does this bearing set come with installation instructions?

While this set is designed for a direct fit, it's always recommended to refer to the manufacturer's installation instructions for specific details and torque specifications. Proper installation is key to ensuring the longevity and performance of the bearings.

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Trusted Since 1957

Est. 1957

Specifications

Brand: ACL
Part #: 5M1117A-20

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-t14-630758
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 bearing set for reliable engine performance.

Key Features

Fits 1979 Ford Mustang.
Main bearing set for Ford 4.1L (122-140) engines.
Helps restore proper oil pressure and reduce engine noise.
Well-built for durability under engine operating conditions.
Designed for a direct fit installation.

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About this part

Product Details

These bearings are made with a durable material that's designed to handle the pressures and heat inside your engine. They fit right into the crankshaft housing, ensuring that the crankshaft can spin freely with the correct oil clearance. Proper main bearings are crucial for the longevity of your engine, preventing excessive wear on the crankshaft and the engine block.

When you're rebuilding or repairing your engine, using a well-made bearing set like this ACL unit is important for getting the job done right. Make sure to follow the manufacturer's installation instructions and torque specifications to ensure the best performance and durability.