Name: ACL Nissan 4 1952-2389cc Z20/Z24 1974-89 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-nissan-4-1952-2389cc-z20-z24-1974-89-engine-crankshaft-main-bearing-set-t14-633115
Price: 46.18 USD
Availability: BackOrder

Question 1

What does '0.50 undersize' mean?

Accepted Answer

When an engine is rebuilt, the crankshaft journals are sometimes machined to remove damage. This makes the journals smaller. Undersized bearings like these compensate for that material removal, maintaining the correct oil clearance between the crankshaft and the bearing.

Question 2

What other parts should I replace when installing these bearings?

Accepted Answer

At a minimum, you should plastigage the bearings to confirm proper oil clearance. It's also best practice to replace the rod bearings at the same time as the main bearings, along with the rear main seal.

Question 3

How do I know if I need standard size or undersized bearings?

Accepted Answer

If your crankshaft has been machined, you'll need undersized bearings. A machine shop can measure your crankshaft journals and tell you what size bearing you need. If the crank is still at the factory size, use standard bearings.

Specifications

ACL Nissan 4 1952-2389cc Z20/Z24 1974-89 Engine Crankshaft Main Bearing Set

Key Features

Specifications

Frequently Asked Questions

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