How many pistons do I need for my Jeep engine?

For Jeep 2.5L engines, you will typically need four pistons. For Jeep 4.0L engines, you will typically need six pistons. It's always best to confirm your engine's cylinder count before ordering.

What does 'standard bore' mean for this piston?

Standard bore means this piston is designed for an engine cylinder that has not been enlarged beyond its original factory diameter. If your engine has been previously rebuilt and bored out, you may need an oversize piston.

Does this piston come with rings?

This Omix piston includes the wrist pin but does not come with piston rings. You will need to purchase piston rings separately to complete the installation.

Specifications

Brand: OMIX
Part #: 17427.07
UPC: 804314060084

OMIX

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

Name: Omix Piston Std 2.5 4.0L 83-95 Jeep CJ & Wrangler
Brand: OMIX
SKU: omix-omix-piston-std-2-5-4-0l-83-95-jeep-cj-wrangler-t14-442040
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 standard bore piston for 2.5L/4.0L Jeep engines. Replaces worn engine parts for restored performance. 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.
Standard bore size for engines that haven't been significantly overbored.
Includes the necessary wrist pin for installation.
Sold individually; order four for 2.5L engines or six for 4.0L engines.
Direct fit replacement designed to OE style specifications.
Backed by a Limited 5 Year Warranty.

⚠️ 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

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About this part

Product Details

When you're rebuilding a tired Jeep engine, replacing worn internal components is key to getting back that original power. Over time, surfaces like piston rings, bearings, and journals naturally wear down. This Omix standard bore piston is built to replace those worn parts, helping to restore your engine's performance. It's designed to fit a wide range of Jeep models from 1983 to 1995, including popular vehicles like the CJ-7, Wrangler YJ, and Cherokee XJ, when equipped with the 2.5L or 4.0L engine.

This piston comes standard bore, meaning it's meant for engines that haven't been significantly overbored during a rebuild. It includes the necessary wrist pin for installation. Omix offers these replacement pistons individually, so you'll need to order the correct quantity for your specific engine – typically four for a 2.5L or six for a 4.0L. It's a direct fit replacement, designed to match the OE style and dimensions for a straightforward installation process when you're putting your engine back together.