What does '0.25mm oversized' mean for these main bearings?

This means the bearings are slightly larger than standard size. They are intended for use when the crankshaft journals have been machined down by 0.25mm to remove wear or imperfections. This allows for the correct bearing clearance once installed.

What is the typical application for these main bearings?

These bearings are commonly used during engine rebuilds for the G63B and 4G63 engines found in certain Mitsubishi and Hyundai vehicles. They are essential for restoring proper crankshaft support and oil clearance.

Do these bearings come with installation instructions?

While specific installation instructions are not included with the bearings themselves, it is critical to refer to the vehicle manufacturer's service manual for proper installation procedures, torque specifications, and critical measurements.

ACL 83-92 Mitsubishi 1997CC G63B/4G63 0.25mm Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1144A-.25
UPC: 084777700774

ACL 83-92 Mitsubishi 1997CC G63B/4G63 0.25mm Oversized Main Bearing Set

Name: ACL 83-92 Mitsubishi 1997CC G63B/4G63 0.25mm Oversized Main Bearing Set
Brand: ACL
Price: 22.84 USD
Availability: InStock

$22.84

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Fits 1989-1991 Hyundai Sonata. ACL 0.25mm oversized main bearing set for G63B/4G63 engines.

Key Features

Fits 1989-1991 Hyundai Sonata.
ACL main bearing set for G63B/4G63 engines.
Bearings are 0.25mm oversized for use on machined crankshafts.
Multi-layer bearing material with steel backing for strength.
Bronze-aluminum alloy intermediate layer and bearing overlay.

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Fits this vehicle

Hyundai Sonata 1989-1991

Product Details

When you're rebuilding the bottom end of your 1989-1991 Hyundai Sonata with the G63B or 4G63 engine, getting the main bearings right is crucial for engine longevity. These ACL main bearings are designed to be 0.25mm oversized, which is helpful if your crankshaft journals have been machined down slightly during a rebuild to clean them up. ACL is a well-known name in engine bearings, and they make these to handle the stresses of daily driving and more.

These bearings are made with a multi-layer material that includes a steel backing for strength, a bronze-aluminum alloy intermediate layer, and a bearing overlay. This construction helps them withstand the high loads and temperatures found in an engine's main bearing saddles. The 0.25mm undersize means they'll provide the correct clearance when installed on a crankshaft that's been turned down by that amount, ensuring proper oil flow and preventing excessive wear.

When installing these bearings, make sure to follow the manufacturer's instructions for cleaning the crankshaft and block surfaces, and always use the correct torque specifications. Proper installation is key to getting the most out of these well-built bearings.