What does the '.040' designation mean for these pistons?

The '.040' indicates that these pistons are 0.040 inches smaller in diameter than the standard factory size. This is an undersize piston, typically used when the engine's cylinder bores have been machined (honed or bored) to correct for wear or damage.

What is the 'PC' designation on these pistons?

The 'PC' designation on Mahle pistons usually refers to specific features on the piston crown, such as valve reliefs or the shape of the combustion bowl. These are critical for ensuring proper clearance with the valves and optimizing the combustion process in your diesel engine.

What other parts are typically needed when installing new pistons?

When installing new pistons, it is highly recommended to also replace the piston rings, connecting rod bearings, and main bearings. It's also a good time to inspect and potentially replace wrist pins and connecting rod bolts.

Mahle OE Cummins 5.9L ISB Diesel Piston Set 2243355040

Name: Mahle OE Cummins 5.9L ISB Diesel 6CYL .040 w/ PC Piston Set (Set of 6)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-cummins-5-9l-isb-diesel-6cyl-040-w-pc-piston-set-set-of-6-t14-53504
Price: 611.40 USD
Availability: BackOrder

Mahle OE Cummins 5.9L ISB Diesel 6CYL .040 w/ PC Piston Set (Set of 6)

$611.40

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 Cummins 5.9L ISB Diesel 6CYL .040 w/ PC Piston Set (Set of 6)

Key Features

Set of 6 pistons for Cummins 5.9L ISB 6-cylinder diesel engines.
Pistons are machined to a 0.040 inch undersize for use in rebuilt or honed cylinders.
Manufactured by Mahle OE, a trusted name in engine components.
Features 'PC' designation, indicating specific piston crown design for optimal combustion.
Designed to meet original equipment specifications for reliable fit and function.

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Product Details

These Mahle OE pistons are precisely machined to a 0.040 inch undersize, meaning they are designed to replace worn pistons in your Cummins 5.9L ISB diesel engine. When rebuilding or repairing the top end of your engine, using pistons that are manufactured to the original equipment specifications ensures proper fit and function. This set includes six pistons, enough for a complete 6-cylinder engine overhaul.

Mahle OE is known for producing well-built engine components that meet or exceed factory standards. These pistons are constructed from durable materials and feature a specific design, indicated by 'PC', which typically refers to specific piston crown features like valve reliefs or combustion bowl geometry that are critical for optimal combustion and performance in your diesel engine. The 0.040 inch undersize is important for engines where the cylinder bores have been honed or bored out to correct for wear, ensuring a tight seal and efficient compression. Using the correct undersize is crucial for engine longevity and performance.

When undertaking an engine rebuild of this magnitude, it's important to have all necessary components ready. This set provides the pistons, but remember to also consider new piston rings, connecting rod bearings, and main bearings to complete the job properly. Always refer to your Cummins service manual for detailed installation procedures, torque specifications, and recommended clearances to ensure a successful rebuild.