The ACL Race Series 6B1395H-.50 connecting rod bushes are designed for BMW N52 and N53 2.5- and 3.0-liter inline-6 engines. This 0.50 mm repair-fit version is intended for rebuilding an engine whose crankshaft has been ground to the corresponding dimension.
Designed for high-performance engines, the ACL Race Series features a trimetal construction suited to the high stresses encountered at the connecting rod bearings. Their role is to ensure a precise interface between the connecting rods and the crankshaft journals while maintaining the oil film essential for the proper operation of the lower engine.
0.50 mm repair dimension for BMW N52 and N53 engines
Part number 6B1395H-.50 corresponds to the 0.50 mm size within the ACL 6B1395H series. It is intended for a crankshaft that has undergone a resurface operation specifically requiring this size and should not be confused with the STD, 0.025 mm, or 0.25 mm versions.
Before selecting these bearings, it is essential to perform a complete measurement of the crankshaft journals and to verify the intended oil clearance during assembly. The bearing size depends on the sizes of the crankshaft after machining and not on the power output of the engine.
ACL Race Series for lower engine rebuilds
The 6B1395H-.50 bearings are designed for BMW N52 and N53 engines with displacements of 2,497 and 2,996 cm³. ACL specifies a standard rod journal diameter of 49.973 to 49.993 mm and a housing diameter of 53.600 to 53.616 mm for the 6B1395H family.
This version therefore provides a solution for engine rebuilds requiring a 0.50 mm clearance. Dimensional compatibility and operating clearance must be verified by the engine builder before final assembly.
Technical Specifications for ACL Race Series 6B1395H-.50 Bearings
Brand: ACL
Range: Race Series
Manufacturer Part Number: 6B1395H-.50
Type: connecting rod bushes
Design: trimetal
Dimension: 0.50 mm repair
Engine Applications: BMW N52 and N53
Cubic capacity: 2.5 and 3.0 liters
Engine configuration: 6 cylinders in line
Standard rod journal diameter: 49.973 to 49.993 mm
Bore diameter: 53.600 to 53.616 mm
Maximum thickness at the top: 1.793 mm
Maximum width: 17.55 mm
ACL material: F781
Selection: based on grinding, crankshaft measurement, and required oil clearance
