Home » General Motors GM-44640 Valve Stem Seal Installer
Kent-Moore J-44640 Valve Stem Seal Installer
Kent-Moore J-44640 Valve Stem Seal Installer

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GM Special Tools and Equipment

General Motors GM-44640 Valve Stem Seal Installer

SKU: GM-44640
$168.03

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General Motors GM‑44640 Valve Stem Seal Installer – Kent‑Moore J‑44640

The GM‑44640 Valve Stem Seal Installer (Kent‑Moore J‑44640) is a precision tool designed for installing valve stem seals to the correct depth on 2001‑later GMT800 2500HD and 3500 trucks equipped with the 6.6L Duramax diesel engine. Proper valve stem seal installation is critical for preventing oil leakage into the combustion chamber, ensuring clean engine operation, reduced emissions, and long‑term reliability.

This installer is engineered for use with or without the valve in place, making it ideal for both in‑vehicle and bench cylinder head service. Simply position the GM‑44640 over the valve stem seal and apply downward force until the seal is fully seated. Its straightforward operation and precise fit make it an essential tool for diesel technicians and engine rebuilders working on Duramax platforms.

Key Features

  • Designed for 6.6L Duramax diesel engines (2001‑later GMT800 2500HD & 3500)
  • Ensures valve stem seals are installed to the correct depth
  • Prevents oil leakage into the cylinder for cleaner, more efficient engine operation
  • Works with or without the valve installed
  • Simple, reliable operation for professional diesel repair environments
  • Kent‑Moore Tool Number: J‑44640 (Discontinued)

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