What does it mean that these pistons are 0.040 inch undersize?

This means the pistons are manufactured to be 0.040 inches smaller in diameter than the standard factory size. This is common during engine rebuilds to account for any wear in the cylinder bores or to achieve a precise, tight fit.

Does this piston set come with everything needed for installation?

Yes, Mahle includes pistons with the piston rings already mounted. The set also comes with the necessary piston pin and clips, making it ready for installation into your engine.

Are these pistons suitable for all 6.6L Duramax engines?

This specific set is designed for 2006-2009 GM 6.6L Duramax LMM and LBZ engines with VIN code 26D. It is important to verify fitment for your specific vehicle's year and VIN.

Mahle OE GM 6.6L Duramax Piston Set 2243709040

Name: Mahle OE GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .040 Left Bank Only Piston Set (Set of 4)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-gm-6-6l-duramax-06-09-lmm-lbz-vin-26d-040-left-bank-only-pisto-t14-53090
Price: 548.43 USD
Availability: BackOrder

Mahle OE GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .040 Left Bank Only Piston Set (Set of 4)

$548.43

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle OE GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .040 Left Bank Only Piston Set (Set of 4). These pistons are .040 inch undersize for a precise fit.

Key Features

Fits 2006-2010 Chevrolet and GMC 6.6L Duramax 2500 HD and 3500 HD trucks.
These are 0.040 inch undersize pistons, designed for a precise fit in rebuilt engines.
Features expansion-controlled designs for reduced engine noise and improved oil control.
Compensated ring grooves ensure proper ring loading and effective oil management.
Pistons come with mounted piston rings, pin, and clips for easier installation.
OE quality from Mahle, a leading global OE piston manufacturer.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

These Mahle OE pistons are built to the original equipment specifications for GM 6.6L Duramax diesel engines, specifically for the LMM and LBZ models from 2006-2009 with VIN code 26D. They are precisely machined to be 0.040 inch undersize, ensuring a proper fit during your engine rebuild. Mahle is a major OE piston manufacturer worldwide, so you know you're getting parts that meet the same standards as what came from the factory.

What sets these pistons apart is their expansion-controlled design, which helps maintain small fitting clearances. This is crucial for reducing engine noise, minimizing wear on critical components, and controlling emissions, all while improving oil control. The compensated ring grooves are also a key feature, designed to ensure correct ring loading and effective oil management. Mahle makes installation easier by including pistons with mounted piston rings, along with the necessary pin and clips, so you can get right to work on your engine build.

This set includes four pistons for the left bank of your engine. If you're rebuilding your Duramax engine, these Mahle OE pistons offer a well-built, direct replacement option that maintains the original performance and reliability of your truck. They are ready for installation, saving you time and effort during a complex engine job.