What does the +0.25mm sizing mean for these bearings?

The +0.25mm designation means these bearings are slightly larger than standard size. They are intended for use when the crankshaft journals have been machined down by 0.25mm to correct wear or damage. Using the correct bearing size is critical for proper oil clearance and engine longevity.

What is bimetal construction?

Bimetal bearings, like these from King, use a combination of materials. They typically have a steel backing for strength and an aluminum-based overlay that provides good wear resistance and conformability to the crankshaft. This construction is common in many engine bearing applications.

Do these bearings come with installation hardware?

This product is a set of main bearings only. Installation hardware, such as main bearing bolts or seals, are typically sold separately. Always refer to the manufacturer's instructions for a complete list of required components for your engine rebuild.

Specifications

Brand: King Engine Bearings
Part #: MB552AM1.25
UPC: 611500169052

King Engine Bearings Toyota 3T/Tg/12T/4Tg (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Toyota 3T/Tg/12T/4Tg (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-3t-tg-12t-4tg-size-0-25mm-main--t14-770790
Price: 37.50 USD
Availability: BackOrder

$37.50

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Fits 1971-1982 Toyota Corolla. King Engine Bearings main bearing set with bimetal construction for improved durability.

Key Features

Fits 1971-1982 Toyota Corolla, Carina (1971-1973) with 3T/TG, 12T, 4TG engines.
Main bearing set sized at +0.25mm for use with a machined crankshaft.
Features a bimetal construction with an aluminum base for durability.
Designed as a direct replacement for the original main bearings.

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About this part

Product Details

If you're rebuilding the engine in your 1971-1982 Toyota Corolla, especially those with the 3T, TG, 12T, or 4TG engines, getting the main bearings right is crucial for long-term reliability. These main bearings from King Engine Bearings are designed to be a direct replacement, ensuring your crankshaft has a solid foundation to spin smoothly.

Built with a bimetal construction, meaning they have an aluminum base, these bearings offer a good balance of strength and wear resistance for everyday driving. This set is specifically sized at +0.25mm, which is important if you're machining your crankshaft to that size during your rebuild. Proper bearing clearance is key to oil flow and preventing premature wear, and using the correct size bearing set is the first step.

When you're putting an engine back together, using well-made components like these King bearings can make a noticeable difference in how the engine performs and lasts. Make sure to follow the manufacturer's installation instructions carefully, including proper cleaning and lubrication, to get the best results from your engine build.