What does the '1.0mm undersize' mean for these bearings?

The '1.0mm undersize' designation means these bearings are designed to fit a crankshaft that has been machined down by 1.0mm. This is common during engine rebuilds if the crankshaft journals have wear or damage that requires grinding.

What is the construction of these main bearings?

These main bearings feature a bimetal construction, utilizing an aluminum base. This type of construction is chosen for its good performance characteristics in engine bearing applications.

What other parts are typically replaced during a main bearing job?

When replacing main bearings, it's common practice to also replace the connecting rod bearings (also known as rod bearings) to ensure consistent oil clearance throughout the engine's rotating assembly. You'll also need new engine oil and an oil filter.

Specifications

Brand: King Engine Bearings
Part #: MB5177AM1.0
UPC: 611500224447

King Engine Bearings Mitsubishi 4G63/64/DOHC (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings Mitsubishi 4G63/64/DOHC (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mitsubishi-4g63-64-dohc-size-1-0mm-mai-t14-770514
Price: 88.36 USD
Availability: BackOrder

$88.36

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King Engine Bearings Main Bearing Set for Mitsubishi 4G63/64 DOHC engines. This is a 1.0mm undersize set for engine rebuilds.

Key Features

Fits 1990-1994 Dodge Ram 50, 1992-1996 Eagle Summit, 1993-1994 Mitsubishi Eclipse, and more.
Main bearing set for Mitsubishi 4G63 and 4G64 DOHC engines.
Features a bimetal construction with an aluminum base.
This set is 1.0mm undersize, intended for use with a machined crankshaft.
Helps maintain proper oil clearance and oil pressure.

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About this part

Product Details

If you're rebuilding the bottom end of your Mitsubishi 4G63 or 4G64 DOHC engine, a fresh set of main bearings is crucial. These main bearings from King Engine Bearings are built with a bimetal construction, using an aluminum base for good performance. This set is specifically sized at 1.0mm undersize, which is important if your crankshaft journals have been machined down during a rebuild.

King Engine Bearings is a well-known name in engine components, and this set is designed to fit a range of vehicles including the Dodge Ram 50, Eagle Talon, and Mitsubishi Eclipse. Having the correct main bearings ensures proper oil clearance between the crankshaft and the engine block, which is vital for oil pressure and engine longevity. Using the right size bearing, especially after any machining work on the crankshaft, is key to achieving optimal performance and durability.