What does '.040 Over' mean for this piston?

The '.040 Over' designation means this piston is 0.040 inches larger in diameter than the original factory piston. This size is used when the engine's cylinders have been bored out to match this larger diameter during a rebuild to account for wear or damage.

Does this piston come with rings?

This Omix piston is sold individually and includes the wrist pin. Piston rings are typically sold separately and should be purchased to match the piston size and engine specifications.

What is the warranty on this Omix piston?

This replacement piston comes with a limited 5-year warranty from Omix, covering defects in materials and workmanship.

Specifications

Brand: OMIX
Part #: 17427.10
UPC: 804314152192

OMIX

Omix Piston 2.5 4.0L .040 83-95 Jeep CJ & Wrangler

Name: Omix Piston 2.5 4.0L .040 83-95 Jeep CJ & Wrangler
Brand: OMIX
SKU: omix-omix-piston-2-5-4-0l-040-83-95-jeep-cj-wrangler-t14-441563
Price: 57.84 USD
Availability: BackOrder

$57.84

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 1983-1995 Jeep CJ, Wrangler, Cherokee, and more with 2.5L or 4.0L engines. .040 inch overbore. Includes wrist pin.

Key Features

Fits 1983-1995 Jeep CJ, Wrangler, Cherokee, Comanche, Grand Cherokee, Scrambler, and Wagoneer models with 2.5L or 4.0L engines.
This is a 0.040 inch overbore piston, intended for engines where cylinders have been machined to a larger diameter.
Includes the necessary wrist pin for installation.
Sold individually; order the quantity needed for your specific engine application (typically four or six).
Backed 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

When you're rebuilding a worn-out engine, replacing internal components is key to getting back that lost performance. This Omix replacement piston is designed for Jeep models from 1983 to 1995 that have the 2.5L or 4.0L engine and require a 0.040 inch overbore. It's a direct replacement part that helps restore your engine's original power. You get one piston and its corresponding wrist pin in this package, and you'll need to order the correct quantity for your specific engine – typically four or six.

This piston is made to meet the needs of a Jeep engine rebuild. Since it's an overbore piston, it's intended for engines where the cylinders have already been machined to a larger diameter. This is a common step when dealing with significant wear or damage to the cylinder walls, allowing you to salvage the block rather than needing a complete replacement. The limited 5-year warranty offers some peace of mind for this critical engine component.