What does 0.50mm oversized mean for these 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 0.50mm (approximately 0.020 inches) to remove wear or damage. This ensures a proper fit on a reconditioned crankshaft.

Are these bearings suitable for a stock crankshaft?

No, these bearings are specifically 0.50mm oversized. If your crankshaft is still at its original factory size, you would need standard size bearings. Always verify your crankshaft journal dimensions before ordering bearings.

What is the primary function of main bearings?

Main bearings support the crankshaft within the engine block and allow it to rotate smoothly. They are critical for maintaining correct oil pressure and ensuring the crankshaft stays properly aligned.

ACL

ACL 83-92 Mitsubishi 1997CC 4G63B/4G63 0.50mm Oversized Main Bearing Set

Name: ACL 83-92 Mitsubishi 1997CC 4G63B/4G63 0.50mm Oversized Main Bearing Set
Brand: ACL
Price: 22.84 USD
Availability: InStock

$22.84

Fits 1989-1991 Hyundai Sonata. ACL 0.50mm oversized main bearing set for your 4G63 engine. Essential for engine rebuilds.

Key Features

Fits 1989-1991 Hyundai Sonata.
ACL main bearing set for 1997cc 4G63B/4G63 engines.
Bearings are 0.50mm oversized, intended for use with a machined crankshaft.
Helps restore proper oil clearance and maintain oil pressure.
Well-built for engine rebuild applications.

Fits this vehicle

Hyundai Sonata 1989-1991

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Product Details

You get a full set of 0.50mm oversized main bearings in this kit, which means one box handles the critical bottom-end component for your engine rebuild. These ACL bearings are made for the 1997cc 4G63B or 4G63 engine found in your 1989-1991 Hyundai Sonata. Proper main bearing clearance is crucial for oil pressure and the overall health of your crankshaft.

ACL has been making engine bearings for a long time, and these are well-built for the job. Being 0.50mm oversized means they are designed to be used when the crankshaft journals have been machined down by 0.020 inches (0.50mm) to clean up any wear or damage. This ensures a snug fit and proper oil clearance, which is key to maintaining oil pressure and preventing premature engine wear. If you're rebuilding your Sonata's engine, getting the bearing clearances right is a major step toward a reliable build.