What does 0.25mm undersize mean for these bearings?

An undersize bearing is used when the crankshaft journals have been machined down (ground) to a smaller diameter. This 0.25mm undersize bearing is designed to fit crankshafts that have been machined down by 0.25mm from their original size, ensuring proper oil clearance.

What is the overlay material on these bearings?

ACL uses a specialized overlay material on these performance bearings. This material is chosen for its ability to bond well with crankshaft journals and maintain a consistent oil film, which is crucial for reducing friction and wear under demanding conditions.

What else do I need when installing these main bearings?

When installing main bearings, you'll need to ensure the crankshaft and block are meticulously clean. It's also essential to use a quality assembly lubricant on the bearing surfaces and journals before installation. Always refer to the manufacturer's service manual for specific torque specifications and procedures.

ACL Engine Main Bearing Set 5M1219H-.25

Name: ACL Mitsubishi 4G63/4G64 7 Bolt EVO V-IX 0.25mm Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-evo-v-ix-0-25mm-oversized-high-performance-m-t14-13015
Price: 69.63 USD
Availability: InStock

ACL Mitsubishi 4G63/4G64 7 Bolt EVO V-IX 0.25mm Oversized High Performance Main Bearing Set

$69.63

Only 5 left in stock

ACL 4G63/4G64 7 Bolt EVO V-IX 0.25mm Oversized High Performance Main Bearing Set

Key Features

Fits 7-bolt Mitsubishi 4G63 and 4G64 engines.
0.25mm undersize main bearing set.
Features a performance overlay material for improved journal compatibility.
Designed to maintain proper oil clearance and support the crankshaft.

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Will this fit your vehicle?

Product Details

Rebuilding the top end of your Mitsubishi 4G63 or 4G64 engine? If you're working on a 7-bolt block from an EVO V through IX, or other compatible models, this ACL main bearing set is a solid choice. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block. When you're pushing your engine hard, or if the original bearings have seen better days, a fresh set is essential for proper oil pressure and long-term engine health.

ACL has been making engine bearings for a long time, and this set is built to handle the demands of performance applications. They're made with a specific overlay material that's designed to work well with the crankshaft journals, helping to maintain oil film and reduce friction. This particular set is 0.25mm undersize, which is important if your crankshaft has been ground down during a previous rebuild or to correct minor imperfections. Using the correct undersize bearing is key to achieving proper oil clearance and ensuring the engine runs right.

This set includes the main bearings needed for your 7-bolt 4G63 or 4G64 engine. Make sure to check your crankshaft's condition and measure the journals to confirm you need the 0.25mm undersize size before ordering. Proper installation, including thorough cleaning of all components and using the correct assembly lube, is critical for the longevity of these bearings and your engine.