Name: ACL Mazda 4 2977-3455cc 1977-90 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-mazda-4-2977-3455cc-1977-90-engine-crankshaft-main-bearing-set-t14-632885
Price: 17.57 USD
Availability: BackOrder

Question 1

What does this bearing set do?

Accepted Answer

The main bearings support the crankshaft, allowing it to spin freely. They sit between the crankshaft journals and the engine block, providing a smooth surface for rotation and preventing metal-on-metal contact.

Question 2

How do I know if my main bearings need replacing?

Accepted Answer

Worn main bearings can cause a knocking sound from the engine, especially when it's under load. You might also notice a drop in oil pressure. If you're rebuilding the engine, it's always a good idea to replace the bearings.

Question 3

Are these standard size or undersized bearings?

Accepted Answer

This particular set is 0.50mm undersize. This means the bearing is slightly thinner than the standard size, to compensate for a crankshaft that has been machined smaller. Always measure your crankshaft journals before ordering bearings.

Specifications

ACL Mazda 4 2977-3455cc 1977-90 Engine Crankshaft Main Bearing Set

Key Features

Specifications

Frequently Asked Questions

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