ACL 6B1569H-.025 0.025 mm Oversize Rod Bearing Set for BMW S54 (E46 M3 / Z3 / Z4

Vehicle Fitment

• BMW M3 E46 (S54 3.2L) - 2001-2006
• BMW Z3 M Coupe / Roadster (S54 3.2L) - 2001-2002
• BMW Z4 M Coupe / Roadster (S54 3.2L) - 2006-2008

Features

• Race-series tri-metal construction for high fatigue resistance
• 0.025 mm oversize specification for tighter-than-stock oil clearance
• Hardened steel backing for improved structural support
• Increased eccentricity to aid hydrodynamic oil film formation at high RPM
• Increased crush for secure bearing retention
• No flash plating on the back - enhances heat transfer
• Tight, consistent wall tolerances for reliable installation
• Identical upper and lower bearing halves for simplified assembly

Specifications

• Part Number: 6B1569H-.025
• Bearing Size: +0.025 mm oversize
• Oil Clearance: Standard (race spec)
• Half Type: Identical halves
• Material: Tri-metal (steel backing, copper-lead intermediate, lead/tin overlay)
• Shaft (Journal) Size Range: 48.975 mm to 48.991 mm
• Tunnel (Housing) Size Range: 53.000 mm to 53.015 mm
• Maximum Wall at Crown: ~1.993 mm
• Max Overall Shell Length: ~16.00 mm

Included Components

• 6x rod bearing shells (complete set for one inline-6 S54 engine)

Product Description

The ACL 6B1569H-.025 is a high-performance Race Series rod bearing set designed specifically for the BMW S54 3.2L engine used in the E46 M3, Z3 M, and Z4 M. With a +0.025 mm oversize specification, this set provides tighter-than-stock clearances for precision engine builds.

Constructed using tri-metal materials and a hardened steel backing, these bearings deliver excellent strength and durability under high RPM and sporting conditions. Their increased eccentricity helps support a stable oil film even under extreme loads, while the raised crush ensures secure seating in the rod journals.

Ideal for performance-oriented rebuilds, forged-rod applications, or high-stress drivers, this bearing set helps maintain oil pressure, minimizes wear, and ensures long-term reliability in demanding BMW S54 builds.