What does the .020 inch undersize mean for my engine rebuild?

The .020 inch undersize indicates that these pistons are slightly smaller than the original factory size. This is typically used when the engine's cylinders have been bored out by 0.020 inches during the rebuilding process to clean up wear or damage and restore the correct piston-to-wall clearance.

Are the piston rings included and pre-installed?

Yes, this Mahle OE piston set comes with the piston rings already mounted onto the pistons. This saves you a step during the engine assembly process, making the rebuild more convenient.

What else might I need to complete the piston installation?

In addition to these pistons, you will need engine assembly lubricant, new rod bearings, and potentially new wrist pin bushings depending on your specific engine's condition. Always refer to the manufacturer's detailed installation instructions for a complete list of recommended items and procedures.

1994 Ford F-250 Piston Set | Mahle OE

Name: Mahle OE NAVI 7.3L IDI Turbo DSL V8 T .020 w/ PC Piston With Rings Set (Set of 8)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-navi-7-3l-idi-turbo-dsl-v8-t-020-w-pc-piston-with-rings-set-se-t14-53235
Price: 1213.85 USD
Availability: BackOrder

Mahle OE NAVI 7.3L IDI Turbo DSL V8 T .020 w/ PC Piston With Rings Set (Set of 8)

$1213.85

On Backorder

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

Fits 1994 Ford F-250. Mahle OE diesel piston set, 0.020 inch undersize. Set of 8 with rings for a convenient rebuild.

Key Features

Fits 1994 Ford F-250, F-350, F-59 Commercial Stripped Chassis, and F-Super Duty.
Set includes 8 pistons, ready for installation with mounted piston rings.
Pistons are .020 inch undersize, suitable for bored cylinders.
Features compensated ring grooves for proper ring loading and oil control.
Expansion-controlled design reduces engine noise, wear, and emissions.
OE quality construction ensures reliable performance and fitment.

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Product Details

If you're rebuilding the engine in your 1994 Ford F-250, F-350, F-59 Commercial Stripped Chassis, or F-Super Duty with the 7.3L IDI Turbo Diesel V8, a solid set of pistons is crucial. Mahle OE pistons are built to the same standards as the original equipment, ensuring your engine runs reliably. These pistons are specifically designed for the 7.3L IDI Turbo Diesel engine and come in a .020 inch undersize, which is important if your cylinders have been bored out during the rebuild process.

Mahle OE pistons feature compensated ring grooves. This design helps ensure the piston rings are properly loaded, which is key for good oil control and preventing blow-by. They also use expansion-controlled designs. This means the pistons are made to maintain small, precise clearances within the cylinder bore, even as the engine heats up. This reduces engine noise, minimizes wear over time, and helps keep emissions in check while improving oil consumption. For your convenience, these pistons come with the piston rings already mounted, and the necessary pins and clips are included, so they're ready for installation right out of the box.

Mahle is one of the largest original equipment piston manufacturers globally, meaning they have extensive experience in producing high-performance engine components. This set includes all eight pistons needed for a complete engine overhaul, making it a straightforward choice for your diesel rebuild project. Please note that this part is not CARB approved and cannot be shipped to California.