What does the .040 undersize mean for these pistons?

The .040 undersize indicates that these pistons are slightly smaller in diameter than the standard size. This is common for replacement pistons when the engine cylinders have been bored out to a larger size during a rebuild to clean up wear or damage.

Are these pistons suitable for all 5.9L Cummins engines from 2003-2004?

No, this specific set is for the non-High Output (non-HO) versions of the B 5.9L engine with the Vin 6 engine code. It's important to confirm your engine's exact configuration before purchasing.

What other parts are typically needed when installing new pistons?

When installing new pistons, it's standard practice to also replace piston rings, connecting rod bearings, and main bearings. It's also recommended to inspect cylinder walls, crankshaft journals, and connecting rods for wear or damage.

Mahle OE Cummins Piston Set 2243674040 - B 5.9L

Name: Mahle OE Cummins B 5.9L STD 03-04 non-HO 16.3:1 CR Vin 6 Eng ETC .040 Piston Set (Set of 6)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-cummins-b-5-9l-std-03-04-non-ho-16-3-1-cr-vin-6-eng-etc-040-pi-t14-53009
Price: 618.91 USD
Availability: InStock

Mahle OE Cummins B 5.9L STD 03-04 non-HO 16.3:1 CR Vin 6 Eng ETC .040 Piston Set (Set of 6)

$618.91

Only 1 left in stock

Mahle OE Cummins B 5.9L piston set for 2003-2004 non-HO Vin 6 engines. Features 16.3:1 CR and .040 undersize for a precise rebuild.

Key Features

Fits 2003-2004 Cummins B 5.9L non-HO Vin 6 engines.
Features a 16.3:1 compression ratio.
Pistons are .040 inch undersize for honed or bored cylinders.
Set includes six pistons for a complete engine rebuild.
Manufactured by Mahle OE to meet original equipment specifications.

This piston set is designed for 2003-2004 Cummins B 5.9L engines with the non-HO and Vin 6 configuration. Please verify your engine's specifications before ordering.

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Product Details

If you're rebuilding the engine in your 2003-2004 Cummins B 5.9L that isn't the High Output (HO) version and has the Vin 6 engine code, a fresh set of pistons is crucial for restoring performance and reliability. This piston set from Mahle OE is built to meet the original specifications for your engine, ensuring a proper fit and function. They are designed for engines with a 16.3:1 compression ratio and come at a .040 inch undersize, which is important for engines that may have had their cylinders honed or bored during a previous rebuild.

Mahle OE is known for making well-built engine components, and this piston set is no exception. Each piston is manufactured to precise tolerances, which helps ensure proper sealing against the cylinder walls and contributes to efficient combustion. The set includes six pistons, enough for a complete engine overhaul. Having pistons that are the correct size and specification is vital for the longevity and performance of your diesel engine, especially when dealing with the higher stresses and demands of a Cummins B 5.9L.

When undertaking an engine rebuild of this caliber, it's important to have all the necessary components ready. This set provides the core piston pieces needed for your engine. Always refer to your vehicle's service manual or consult with a professional mechanic for specific installation procedures, torque specifications, and any other related parts that may be required for a complete and successful engine rebuild.