LB7 Duramax Injector Seal Kit 2001-2004

Overview

This is an injector seal, cup and tube service kit for the Chevrolet, GMC LB7 Duramax diesel (2001-2004). Built to OEM specification and engineered as a direct-fit replacement for a professional-grade LB7 Duramax repair or service. Every order ships fast and is backed by our support team.

What It Does & How It Helps

Each injector is sealed to the cylinder head by a copper combustion washer and a set of O-rings, and on many engines it rides in a steel cup or sleeve. When those seals harden or a cup erodes, combustion gases chuff past the injector, fuel washes down into the oil, or a cylinder runs rough. A complete seal, cup and tube service kit restores a gas-tight injector seal and clean fuel control whenever the injectors are pulled or a leak is traced to the injector base — the correct way to reseal rather than reuse tired parts.

What's Included

• injector combustion (copper) seals and O-rings
• injector cups/sleeves and connector or ball tubes as applicable
• hold-down and related hardware where specified

Fitment

Fits Chevrolet, GMC trucks equipped with the LB7 Duramax diesel engine, 2001-2004. Please confirm your engine and year before ordering to ensure correct fitment.

Common Symptoms & When to Use

Consider this LB7 Duramax part when you experience:

• a chuffing or combustion leak at the injector
• fuel in the oil or oil consumption
• a rough-running cylinder
• an injector reseal, cup replacement or install

Specifications

• Engine: LB7 Duramax
• Year Range: 2001-2004

Quality & Service

Fast shipping on in-stock orders. Free shipping on orders over $70. Backed by Core Diesel Parts — your source for LB7 Duramax diesel parts.