Mahle OE Cummins B 71.585mm CH .020 w/ PC Eng Pack Piston Set (Set of 6)

These Mahle OE pistons are made to a specific 71.585mm bore size, measuring 0.020 inches undersize from the standard bore. This precise sizing is crucial for rebuilding the engine in your Cummins B series diesel. When you're tearing down an engine for a rebuild, especially one with significant mileage, the cylinders can wear beyond their original specifications. Using pistons that are precisely sized to account for this wear ensures a proper seal and optimal performance once the engine is back together. Mahle OE is a well-known name in the diesel engine world, and these pistons are built to meet the original equipment specifications for your Cummins B engine.

This set includes six pistons, which is what you'll need for a standard inline-six Cummins B engine. They come as part of an 'Engine Pack,' which typically means they include the necessary components for installation, such as wrist pins and retaining clips, though it's always a good idea to confirm the exact contents. The pistons themselves are constructed from durable materials designed to withstand the high pressures and temperatures found in a diesel combustion chamber. The .020 undersize specification means these are intended for engines where the cylinders have been bored out to match this dimension, a common practice during a performance or repair rebuild to restore the cylinder walls to a smooth, round surface. This attention to detail in sizing and material ensures that your engine rebuild will be solid and reliable.

When undertaking an engine rebuild of this magnitude, it's important to have all your parts ready. Ensure you have the correct gasket set, bearings, and any necessary machining completed on your block and crankshaft before installing these pistons. Refer to the manufacturer's installation instructions for specific details regarding assembly and break-in procedures to get the most out of your rebuilt engine.