What does the +0.50mm sizing mean for these bearings?

The +0.50mm sizing indicates that these bearings are designed for a crankshaft that has been machined down by 0.50mm. This is a common practice during engine rebuilding to clean up worn or slightly damaged crankshaft journals.

What is the construction of these main bearings?

These bearings are made with a bimetal construction, which means they have an aluminum base. This design is well-suited for gasoline engines and offers good wear resistance.

Are these bearings a direct replacement for all Nissan L-series engines?

These main bearings are specifically for the L13, L14, and Z18 engines. They are an optional replacement for part number MB 534AM, which typically includes a standard flange.

Specifications

Brand: King Engine Bearings
Part #: MB5231AM0.5
UPC: 611500240126

King Engine Bearings Nissan L13/L14/Z18 (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Nissan L13/L14/Z18 (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-nissan-l13-l14-z18-size-0-50mm-main-be-t14-770566
Price: 74.11 USD
Availability: BackOrder

$74.11

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Fits 1968-1973 Nissan 510. King Engine Bearings L13/L14/Z18 Main Bearing Set (+0.50mm). Bimetal bearings for engine rebuilds.

Key Features

Fits 1968-1973 Nissan 510, 1969-1972 Nissan 521 Pickup, 1973 Nissan 610, 1972-1974 Nissan 620 Pickup, and 1974 Nissan 710.
Main bearing set for Nissan L13, L14, and Z18 engines.
Size is +0.50mm, intended for use with a crankshaft machined to that undersize.
Constructed with a bimetal design featuring an aluminum base.
Designed for gasoline engine applications.

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About this part

Product Details

If you're rebuilding the engine in your 1968-1973 Nissan 510, or a compatible truck like the 521, 620, or 710, these main bearings from King Engine Bearings are a solid choice. These are the main bearings, which support the crankshaft within the engine block, and they're sized at +0.50mm, meaning they're intended for use when the crankshaft journals have been machined down by 0.50mm to clean them up or account for wear.

King uses a bimetal construction, which means they have an aluminum base. This type of bearing is well-suited for gasoline engines like the L13, L14, and Z18 found in these Nissans. They offer good wear resistance and conformability to the crankshaft. This set is an optional replacement for MB 534AM, which typically comes with a standard flange.