What does the +0.25mm size mean for these main bearings?

The +0.25mm designation indicates that these bearings are undersized by 0.25mm. They are intended for use when the engine's crankshaft has been machined down by 0.25mm to remove wear or imperfections from the main journals.

What is the construction of these King Engine Bearings?

These main bearings are made with a bimetal construction, featuring an aluminum base. This type of material is chosen for its ability to form a good oil film and provide durability in the demanding environment of the engine's bottom end.

Do these bearings come with assembly lube?

This set includes the main bearings themselves. It is recommended to use a high-quality engine assembly lubricant during installation to protect the bearing surfaces and ensure proper oil flow on initial startup.

Specifications

Brand: King Engine Bearings
Part #: MB5177AM0.25
UPC: 611500224416

King Engine Bearings Mitsubishi 4G63/64/DOHC (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Mitsubishi 4G63/64/DOHC (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mitsubishi-4g63-64-dohc-size-0-25mm-ma-t14-770511
Price: 88.36 USD
Availability: BackOrder

$88.36

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King Engine Bearings Main Bearing Set MB5177AM0.25 for Mitsubishi 4G63/64 DOHC engines. This is a +0.25mm undersize set.

Key Features

Fits 11+ vehicle make/model combinations.
Main bearing set for Mitsubishi 4G63/64 DOHC engines.
Size is +0.25mm undersize, for use with machined crankshafts.
Constructed with a bimetal aluminum base for reliable performance.
Part number MB5177AM0.25.

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About this part

Product Details

If you're rebuilding the bottom end of your Mitsubishi 4G63 or 4G64 DOHC engine, getting the main bearings right is crucial for proper oil pressure and crankshaft support. This set from King Engine Bearings is specifically designed for those engines and comes at a +0.25mm undersize, meaning it's intended for crankshafts that have been machined down by 0.25mm to clean up wear.

These bearings feature a bimetal construction with an aluminum base, which is a common and effective material for main bearings. This design helps ensure good oil film formation and durability. King is a well-known name in engine bearings, and this set is a solid option for anyone looking to restore their engine's internal components. They fit a range of vehicles, including models like the Dodge Ram 50, Eagle Talon, and Mitsubishi Eclipse from the early to mid-90s, as well as some later Lancers.

When installing these bearings, remember to always follow the manufacturer's torque specifications and ensure the crankshaft journals are clean and properly prepped. Using the correct assembly lube is also important for protecting the bearing surfaces during initial startup.