ACL connecting-rod bearing set — manufacturer catalog product photo
ACL engine bearing-shell profile drawing — shell shape and oil-hole layout
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ACL Honda D16A6 Standard Size High Performance w/ Extra Oil Clearance Rod Bearing Set

$ 91.66
$ 91.66

ACL 4B1956HX-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

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

ACL’s 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.

Manufacturer / Engine Honda — B18A (USA)
Manufacturer / Engine Honda — D15B1
Manufacturer / Engine Honda — D15B2
Manufacturer / Engine Honda — D15B4
Manufacturer / Engine Honda — D15B6
Manufacturer / Engine Honda — D15B7
Manufacturer / Engine Honda — D15B8
Manufacturer / Engine Honda — D15Z1
Manufacturer / Engine Honda — D15Z2
Manufacturer / Engine Honda — D15Z3
Manufacturer / Engine Honda — D15Z6
Manufacturer / Engine Honda — D15Z8
Manufacturer / Engine Honda — D16A1
Manufacturer / Engine Honda — D16A3
Manufacturer / Engine Honda — D16A6
Manufacturer / Engine Honda — D16A7
Manufacturer / Engine Honda — D16A8
Manufacturer / Engine Honda — D16A9
Manufacturer / Engine Honda — D16B2
Manufacturer / Engine Honda — D16B6
Manufacturer / Engine Honda — D16W1
Manufacturer / Engine Honda — D16Y1
Manufacturer / Engine Honda — D16Y4
Manufacturer / Engine Honda — D16Y5
Manufacturer / Engine Honda — D16Y7
Manufacturer / Engine Honda — D16Y8
Manufacturer / Engine Honda — D16Z2
Manufacturer / Engine Honda — D16Z5
Manufacturer / Engine Honda — D16Z6
Manufacturer / Engine Honda — ZC

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

Brand ACL
Manufacturer Part Number 4B1956HX-STD
Component Connecting-Rod Bearing Set
Size Selection STD manufacturer size designation; verify the exact engine and assembled clearance.
Catalog Rod Housing Bore (STD journal) 48.000–48.020 mm
Catalog Rod Journal Diameter (STD) 44.980–45.000 mm
Catalog Family ACL Race Series
Half Type Identical halves
Catalog Size Options STD

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 builder’s 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 4B1956HX-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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