MAHLE 224-3523 OE Replacement Engine Piston Cummins B 5.9L Diesel

The MAHLE 224-3523 is an OE-specification replacement piston engineered for the Cummins B 5.9L inline-6 diesel engine. Manufactured to original equipment standards, this piston delivers the precise fit, dimensional accuracy, and durability required for a reliable engine rebuild or repair.

MAHLE is a globally recognized leader in engine component manufacturing, and this piston carries the same engineering integrity found in original factory applications. The 155° reentrant bowl design is compatible with turbocharged, intercooled configurations, and the cast aluminum construction ensures excellent thermal management and long service life.

Key Specifications:

• Bore Diameter: 4.002 in. (101.660 mm) — Standard sizing
• Stroke: 4.720 in.
• Compression Height: 2.817 in. (71.56 mm)
• Rod Length: 7.559 in.
• Piston Style: Dish / Reentrant Bowl — 47.1cc bowl volume
• Piston Material: Cast aluminum
• Wrist Pin Diameter: 1.575 in. (40.00 mm)
• Wrist Pin Retention: Floating, offset pin hole
• Recess Depth: 0.685 in.
• Recess Diameter: 2.520 in.
• Maximum Oversize: 0.040 in. (1.00 mm)
• Compression Ring Groove 1: 3.00 mm (Keystone top ring)
• Compression Ring Groove 2: 2.40 mm
• Oil Ring Groove Width: 4.00 mm
• Casting Number: 102L37 (OE casting # 102O18 for top ring)
• Related Part Number: S41518

What's Included:

• Wrist pin included
• Wrist pin retainers included
• Piston rings NOT included (order separately)

MAHLE Original pistons feature compensated ring grooves for proper ring loading and oil control, along with expansion-controlled skirt designs for tight fitting clearances — reducing engine noise, wear, and emissions while improving oil control. The non-coated skirt maintains OE-standard performance characteristics. Available in standard and oversize variants (.020, .040) to accommodate engines with worn or machined bores.