Engine Overhaul and Rebuild Kit for BMW N52B25

Engine Overhaul Rebuild Kit –Pistons Rings/ Timing Chain Kit For BMW N52B25

Refurbishment kits for the BMW N52B25 (2.5L) engine—commonly found in 2005 through 2011 model year 325i and 525i vehicles—typically include standard-size (STD) pistons with an 82.00mm bore, compression ratio options of 11:1 or 9.7:1, and a complete set of gaskets. These kits encompass pistons, piston rings, piston pins, main and connecting rod bearings, as well as a full complement of seals.

Description

Key Components and Specifications:
Engine Model: BMW N52B25 (2.5L, Inline-6, Naturally Aspirated). Pistons: 6 standard-size (STD, 0.00mm) pistons and piston rings.
Bore: D82.00mm.
Piston Pins: Diameter D20mm, Length 46mm.
Piston Ring Thickness: 1st Ring 1.2mm / 2nd Ring 1.5mm / 3rd Ring 2.0mm.
Compression Ratio: Typically 11:1 (e.g., 325i, 525i, Z4) or 9.7:1 (e.g., 323i, 523i). Gasket Kit: Complete set, including cylinder head gasket, valve cover gasket, and oil seals (e.g., OE Part No. 11127555310).
Bearings: Main bearing and connecting rod bearing kits (standard size).

Compatibility:
Applicable Models: BMW E90/E91/E92/E93 (3 Series), E60/E61 (5 Series), E83/E84 (X3/X1), E85/E86/E89 (Z4)
Engine Codes: N52B25A, N52B25BF
Notes:
Piston Specifications: Standard bore is 82.00mm.
Timing Chain Kit: Typically sold separately, or included in high-end, comprehensive overhaul kits.
Cylinder Block Material: Aluminum Alloy