What does the +1.0mm sizing mean for my engine?

The +1.0mm sizing indicates that these bearings are intended for a crankshaft that has been machined down by 1.0mm. This is common during engine rebuilds when the original crankshaft journals have wear and are ground to a consistent undersize for new bearings.

What is the bimetal construction with an aluminum base?

This construction uses a combination of materials. The aluminum base provides good conformability, meaning it can adapt to slight imperfections on the crankshaft surface, while other layers offer strength and wear resistance, helping to maintain proper oil clearance.

Is this set a direct replacement for all L28 main bearings?

This set is specifically sized at +1.0mm for L28 engines. It is an optional replacement for MB 768AM, but only when the flange is standard size. Always confirm your crankshaft journal size before ordering.

Specifications

Brand: King Engine Bearings
Part #: MB7732AM1.0
UPC: 611500240447

King Engine Bearings Datsun L28 (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings Datsun L28 (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-datsun-l28-size-1-0mm-main-bearing-set-t14-771099
Price: 85.80 USD
Availability: BackOrder

$85.80

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Fits 1977-1981 Nissan 810. King Engine Bearings main bearing set, 1.0mm undersize, made with an aluminum base bimetal construction.

Key Features

Fits 1977-1981 Nissan 810, 1970-1973 Nissan 240Z, 1974-1975 Nissan 260Z, 1981-1983 Nissan 280ZX, and 1981-1984 Nissan Maxima.
Main bearing set for Datsun L28 engines.
Sized at +1.0mm undersize, suitable for crankshafts that have been machined.
Constructed with a bimetal design featuring an aluminum base for good conformability.
This set is an optional replacement for MB 768AM when the flange is standard size.

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About this part

Product Details

Built with a bimetal construction featuring an aluminum base, this main bearing set from King Engine Bearings is specifically sized at +1.0mm for Datsun L28 engines. This sizing is crucial when rebuilding or refreshing an engine that has already had its crankshaft ground down, ensuring a proper fit and oil clearance. These bearings are designed to handle the demands of the L28, a well-known engine that powered many classic Datsun and early Nissan vehicles.

The aluminum base bimetal construction offers good conformability and embeddability, which helps these bearings work well in applications where the crankshaft may not be perfectly smooth. This updated design helps maintain consistent oil film thickness, critical for protecting the crankshaft and bearing surfaces from wear. This set is an optional replacement for MB 768AM, specifically when the flange is standard size.