What does '.010 oversize' mean for this piston?

'.010 oversize' means this piston is manufactured to be 0.010 inches larger in diameter than the standard factory piston. This is used when engine cylinders have been bored out during a rebuild to correct wear or damage, ensuring a proper fit and seal.

Do I need to buy a full set of pistons?

This piston is sold individually. You will need to purchase the correct number of pistons to match the cylinders in your engine. For a 2.5L or 4.0L Jeep engine, this typically means purchasing four or six pistons.

What kind of work is involved in installing this piston?

Installing new pistons generally requires significant engine work. This includes engine removal, disassembly, cylinder inspection, and often boring the cylinders to the correct size for the oversize piston. It is recommended to consult a service manual or a professional mechanic for installation.

Specifications

Brand: OMIX
Part #: 17427.11
UPC: 804314060091

OMIX

Omix Piston 2.5 4.0L .010 83-95 Jeep CJ & Wrangler

Name: Omix Piston 2.5 4.0L .010 83-95 Jeep CJ & Wrangler
Brand: OMIX
SKU: omix-omix-piston-2-5-4-0l-010-83-95-jeep-cj-wrangler-t14-441564
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 replacement piston for 2.5L and 4.0L Jeep engines. This is a .010 inch oversize piston, sold individually.

Key Features

Fits 1983-1995 Jeep CJ, Wrangler, Cherokee, Comanche, Grand Cherokee, Wagoneer, and Scrambler models with 2.5L or 4.0L engines.
This is a .010 inch oversize piston, intended for use in engines that have been bored out.
Sold individually, so you can purchase the exact number needed for your engine rebuild.
Built to meet or exceed original factory part specifications.
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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About this part

Product Details

This Omix replacement piston is machined to be 0.010 inches oversize, meaning it's designed to fit a cylinder bore that has been honed or bored out to accommodate this larger size. This is a common step when rebuilding an engine to restore proper compression and seal, especially if the original cylinder walls have wear or damage. It's built to meet or exceed factory part standards, ensuring it works correctly with your Jeep's 2.5-liter or 4.0-liter engine.

This piston is sold individually, so you'll need to order one for each cylinder you're replacing. It's designed for a range of Jeep models from the early 1980s through the mid-1990s, including popular vehicles like the CJ7, Wrangler YJ, Cherokee XJ, and Comanche MJ. Keep in mind that installing new pistons typically requires engine work, such as removing the engine, disassembling it, and honing or boring the cylinders to the correct size for this oversize piston.