ACL Ford/Mazda 2.0L/2.3L Duratec Race Main Bearing Set 5M8174H-STD

ACL 5M8174H-STD is a main bearing set for the cataloged Ford / Mazda Duratec 20, Duratec 23, 2.0L Ecoboost, 2.3L Ecoboost engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

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

Within ACLs 2023 Mazda MZR applications, this main family is shared across selected 2.0L LF, 2.3L L3 and L3-VDT DISI Turbo engines. Rod selection differs: 4B4390 for LF, 4B8170 for L3, and 4B8171 without a notch or 4B8172 with a notch for the cataloged L3-VDT configuration. Confirm the exact engine and rod locating features.

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 5M8174H-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.

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