What does '+1.0mm' mean for these main bearings?

The '+1.0mm' designation means these bearings are 1.0 millimeter larger than the standard size. This is used when the engine's crankshaft has been machined down (ground) by 1.0mm to repair wear or imperfections. Using the correct undersize bearing ensures proper fit and oil clearance.

What is the construction of these main bearings?

These main bearings feature a bimetal construction with an aluminum base. This type of bearing material is commonly used in engine applications for its durability and performance characteristics.

Are these bearings a direct replacement for all Nissan L13, L14, and Z18 engines?

These bearings are a direct replacement for the specified engines, but they are a +1.0mm undersize. You must confirm that your engine's crankshaft has been machined to this specific undersize before installation. If your crankshaft is standard size, you will need a standard size bearing set.

Specifications

Brand: King Engine Bearings
Part #: MB5231AM1.0
UPC: 611500240140

King Engine Bearings Nissan L13/L14/Z18 (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings Nissan L13/L14/Z18 (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-nissan-l13-l14-z18-size-1-0mm-main-bea-t14-770568
Price: 74.11 USD
Availability: BackOrder

$74.11

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Fits 1968-1973 Nissan 510. King Engine Bearings main bearing set for L13, L14, and Z18 engines. This is a +1.0mm undersize set.

Key Features

Fits 1968-1973 Nissan 510, 1969-1972 Nissan 521 Pickup, 1973 Nissan 610, 1972-1974 Nissan 620 Pickup, and 1974 Nissan 710.
Designed for Nissan L13, L14, and Z18 engines.
This is a +1.0mm undersize main bearing set, intended for use with crankshafts that have been machined to this size.
Constructed with a bimetal design featuring an aluminum base for reliable performance.
Main bearings support the crankshaft and maintain proper oil clearance within the engine block.

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About this part

Product Details

If you're rebuilding the bottom end of your 1968-1973 Nissan 510, or any Nissan equipped with the L13, L14, or Z18 engine, this main bearing set from King Engine Bearings is what you'll need. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block. They are made with a bimetal construction, meaning they have an aluminum base, which is a common and reliable material for engine bearings.

This particular set is sized at +1.0mm, meaning they are 1.0 millimeter larger than standard. This is important for engines that have had their crankshaft journals ground down during a rebuild to remove imperfections or wear. Using the correct undersize bearing ensures a proper fit and optimal oil clearance, which is vital for engine longevity. King Engine Bearings is a well-known name in engine components, and these bearings are a solid option for your engine build.