ACL BMW B58/B30 3.0L Inline 6 Standard Size Main Bearings

ACL 7M1512HX-STD is a main bearing set for the cataloged BMW B58 B30 engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.

Engine Application

ACLs 2023 guide pairs 6B1510 rod bearings with 7M1512 main bearings for the B58B30 2998cc turbo inline-six, including the A90 Toyota Supra application. B48A20/B48B20 four-cylinder applications instead use the separately cataloged 4B1510 rod set. Match the exact engine code and each bearing location.

The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.

Specifications

Quantity and Assembly Checks

Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.

Measure shaft journals, housing bores and assembled oil clearance using the engine builders specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.

Frequently Asked Questions

Is the year and model enough to choose this bearing? No. Match 7M1512HX-STD to the exact engine and measured build specification.

What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.

Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.

Related Engine Parts

For the cataloged B58B30 application, see ACL 6B1510HX-STD rod bearings. This is a separately sold component with its own measured journal clearance; confirm the exact engine and size before pairing parts.