MAHLE S41909 PISTON RING SET (STD) FOR 2001-2010 GM 6.6L DURAMAX ENGINE

The MAHLE S41909 is a premium piston ring set designed for the 2001–2010 GM 6.6L Duramax diesel engines, including LB7, LLY, LBZ, and LMM variants. This set is engineered to meet or exceed OEM specifications, ensuring reliable performance and durability for your engine rebuild or maintenance needs.

? Product Overview

• Part Number: S41909

• Engine Compatibility: 2001–2010 GM 6.6L Duramax (LB7, LLY, LBZ, LMM)

• Bore Diameter: 4.0551 inches

• Ring Materials:

  • Top Ring: Ductile Iron

  • Second Ring: Cast Iron

  • Oil Ring Assembly: Gas Nitride Steel (GNS)

• Ring Thickness:

  • Top Ring: 0.1181 inches

  • Second Ring: 0.0783 inches

  • Oil Ring Assembly: 0.1177 inches

• Coatings:

  • Top Ring: Plasma-Moly

  • Oil Ring Assembly: Gas Nitride

• Quantity: Set includes 32 rings (8 sets of 4 rings)

• Pre-Lapped: Yes, for immediate seating

? Vehicle Fitment

This piston ring set is compatible with the following GM models equipped with the 6.6L Duramax diesel engine:

• Chevrolet Silverado 2500HD/3500HD (2001–2010)

• GMC Sierra 2500HD/3500HD (2001–2010)

• Chevrolet Express 2500/3500 (2001–2010)

• GMC Savana 2500/3500 (2001–2010)

• Chevrolet Kodiak C4500/C5500 (2003–2009)

• GMC TopKick C4500/C5500 (2003–2009)

• Chevrolet Express 4500 (2009–2010)

• GMC Savana 4500 (2009)

The MAHLE S41909 Piston Ring Set is meticulously engineered to enhance the performance and longevity of the 2001–2010 GM 6.6L Duramax diesel engines, including the LB7, LLY, LBZ, and LMM variants. Crafted from high-quality materials, this premium piston ring set meets or exceeds OEM specifications, ensuring reliable performance for both engine rebuilding and routine maintenance.

This comprehensive set includes a total of 32 precision-engineered rings, featuring eight sets of four rings each. The rings are designed with specific materials for maximum durability: the top ring is made of ductile iron for superior strength, while the second ring is constructed from cast iron. The oil ring assembly utilizes gas nitride steel (GNS) to effectively manage oil levels, contributing to optimal engine functioning.

With a bore diameter of 4.0551 inches, the design accommodates various GM models, including the Chevrolet Silverado and GMC Sierra heavy-duty trucks. Each ring is pre-lapped, enabling immediate seating upon installation, which significantly reduces the initial wear during the break-in period.

The top ring, with a thickness of 0.1181 inches, comes with a Plasma-Moly coating for enhanced wear resistance. The second ring measures 0.0783 inches in thickness, while the oil ring assembly stands at 0.1177 inches, both contributing to the set's overall performance efficiency.

Packaged efficiently for consumer convenience, the MAHLE S41909 Piston Ring Set is available to order, backed by a 12-month warranty. By choosing this product, you ensure your Duramax engine continues to run smoothly and reliably, delivering the performance you expect from a trusted brand like MAHLE.