ACL Subaru FA20 0.025mm Undersize-Journal High Performance Main Bearing Set

ACL 5M8312H-.025 is a main bearing set for the cataloged Subaru / Toyota FA20, FA24D, FA24F, FB20 engine configurations. .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder.

Bearing Configuration

H identifies the ACL Race Series family. Match the complete suffix to the required clearance, shell width and locating features.

ACLs 2023 guide lists this main-bearing family across selected FA20/FA24 and FB20/FB25 configurations. Rod-bearing selection differs: 4B8310 for the cataloged FA engines and 4B8325 for the cataloged FB engines. A shared main-bearing number does not make the rod sets interchangeable; confirm the actual engine and measured assembly.

Engine Application

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 5M8312H-.025 to the exact engine and measured build specification.

What size is this listing? .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder.

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

Related Engine Parts

Shop ACL engine components, engine bearings and oil pumps.