What does the '.030' in the piston size mean?

The '.030' indicates that this piston is designed for an engine cylinder that has been bored out 0.030 inches larger than its original factory size. This is common when rebuilding an engine with significant wear.

Do I need to buy anything else to install this piston?

This piston includes the wrist pin. However, a full engine rebuild typically requires new piston rings, bearings, gaskets, and potentially other internal components. It's recommended to consult a service manual for a complete list of parts needed for your specific engine rebuild.

What is the warranty on this Omix piston?

This Omix piston comes with a limited 5-year warranty. Please refer to the manufacturer's warranty documentation for full details and any exclusions.

Specifications

Brand: OMIX
Part #: 17427.09
UPC: 804314152185

OMIX

Omix Piston 2.5 4.0L .030 83-95 Jeep CJ & Wrangler

Name: Omix Piston 2.5 4.0L .030 83-95 Jeep CJ & Wrangler
Brand: OMIX
SKU: omix-omix-piston-2-5-4-0l-030-83-95-jeep-cj-wrangler-t14-441562
Price: 62.13 USD
Availability: BackOrder

$62.13

On Backorder

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

Omix cast piston for 2.5L and 4.0L Jeep engines. This is a .030 inch overbore replacement part. Fits 1983-1995 Jeep CJ, Cherokee, Wrangler and more. Limited 5-year warranty.

Key Features

Fits 1983-1995 Jeep CJ, Cherokee, Comanche, Grand Cherokee, Scrambler, Wagoneer, and Wrangler models with 2.5L or 4.0L engines.
This is a cast aluminum piston sized 0.030 inches over the standard bore.
Includes the necessary wrist pin for installation.
Designed to replace OE part number 83500251.030.
Sold individually; order the correct quantity for your engine (4 or 6).
Covered by a limited 5-year warranty from Omix.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

No-fit, no charge. Wrong part? Send it back, free return label.

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Will it fit your car?

About this part

Product Details

When you're rebuilding a worn-out Jeep engine, getting the internal components back to spec is key to restoring performance. This Omix cast piston is designed as a direct replacement for engines that have been bored out 0.030 inches over their original size. It's built to help you bring your Jeep's powerplant back to its intended power output.

This piston is a well-built cast aluminum replacement, suitable for 2.5L and 4.0L engines found in a range of Jeep models from the early 80s through the mid-90s, including the CJ, Cherokee (XJ), Wrangler (YJ), and Comanche. It includes the necessary wrist pin for installation. Remember that engine work like this requires careful attention to detail and often involves machining to ensure a proper fit and seal.

Sold individually, you'll need to purchase the correct quantity for your specific engine – typically four for a 2.5L or six for a 4.0L. This part replaces OE number 83500251.030 and comes with a limited 5-year warranty from Omix.