ACL Acura D16A1 Standard Size High Performance Rod Bearing Set

ACL 4B1956H-STD is a connecting-rod bearing set for the cataloged Honda B18A (USA), D15B1 and other listed D-series 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.

Engine Application

ACLs 2023 guide lists 4B1956 for D15B/D15Z engines from September 1991 onward and for D16A/D16B/D16W/D16Y/D16Z. The listed D16 applications use 5M1957 main bearings. B20B/B20Z is separately cataloged with 4B1946 rods and 5M1959 mains; select by the complete engine code and production configuration.

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 rod-bearing set contents and shell positions 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 4B1956H-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

Shop ACL engine components, engine bearings and oil pumps.