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

This means the bearings are slightly larger than standard size by 0.25mm. This is typically used when the engine's crankshaft has been machined undersize to correct wear or damage. Using these oversized bearings helps restore the proper oil clearance between the crankshaft and the main bearing housing.

Are these bearings suitable for a stock engine rebuild?

While these are high-performance bearings, they can be used in a stock rebuild if the crankshaft has been machined undersize. For a completely stock rebuild with an unmachined crankshaft, you would typically use standard size bearings. Always check your crankshaft's specifications and the manufacturer's recommendations.

What other parts are typically replaced during an engine rebuild involving main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings, piston rings, and oil pump. It's also a good time to inspect and potentially replace seals, gaskets, and the timing belt or chain to ensure the entire engine is refreshed.

ACL Main Bearings 5M1186H-.25 0.25mm Oversize

Name: ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IV 0.25mm Oversized High Performance Main Bear
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-7-bolt-2nd-gen-dsm-and-evo-i-iv-0-25mm-oversized-hi-t14-13010
Price: 97.48 USD
Availability: InStock

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IV 0.25mm Oversized High Performance Main Bear

$97.48

Only 2 left in stock

ACL Mitsubishi 4G63/4G64 7 Bolt 2nd Gen DSM and EVO I-IV 0.25mm Oversized High Performance Main Bear

Key Features

Fits 7-bolt Mitsubishi 4G63 and 4G64 engines.
0.25mm oversized main bearings, suitable for machined crankshafts.
Designed for high-performance applications like DSM and EVO I-IV.
Well-built materials ensure proper oil clearance and crankshaft support.
Popular choice for engine rebuilds and performance builds.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and these 0.25mm oversized high-performance main bearings for your Mitsubishi 4G63 or 4G64 engine are one of their staples. If you're rebuilding an engine, especially for a 7-bolt 2nd Gen DSM or EVO I-IV, getting the right bearings is crucial for long-term reliability and performance. These bearings are designed to handle the demands of a performance engine, ensuring proper oil clearance and support for the crankshaft.

These main bearings are 0.25mm oversized, which is important if your crankshaft has been machined undersize during a rebuild. This allows you to achieve the correct oil clearance, which is vital for proper lubrication and preventing premature wear. ACL uses well-built materials and manufacturing processes to create bearings that can withstand higher loads and temperatures than stock components. They are a popular choice for enthusiasts looking to get the most out of their performance engine build.

When rebuilding your engine, it's important to ensure all components are clean and properly lubricated before installation. Refer to the manufacturer's installation instructions for specific details on torque specifications and assembly procedures. These bearings are designed to fit a range of Mitsubishi and Eagle vehicles, so be sure to check the fitment guide to confirm compatibility with your specific application.