Gates 37004P Alternator Decoupler Pulley

Gates Alternator Decoupler Pulley 37004P

The Gates DriveAlign alternator decoupler pulley helps the alternator free-wheel during engine deceleration, reducing belt shock and vibration in the accessory drive. Built as an OE Exact replacement, this Gates 37004P pulley is a direct-fit service part for select Ford, Lincoln, and Mercury applications with high-output alternators.

Key Features

• Alternator decoupler pulley for accessory belt drive vibration isolation
• Allows the alternator to overrun during engine deceleration
• Steel construction with a V-ribbed grooved contact surface
• 6-groove design for OE-style belt engagement
• Flanged design with dust cap included
• OE Exact comparison rating for factory-style fit and function
• Requires installation tool part number 91024-3

Product Line Details

Gates DriveAlign decoupler pulleys are engineered for alternator drive systems that need controlled overrunning behavior rather than a fixed pulley. This product line includes overrunning alternator decoupler pulleys and one-way clutches, which are not interchangeable. The Gates 37004P is built for applications that call for a decoupler pulley and not a one-way clutch.

Fitment

• Fits 2003-2011 Ford Crown Victoria, N/A, with 190A or 200A alternator; installation tool required.
• Fits 2006-2011 Lincoln Town Car, N/A, with 190A or 200A alternator; installation tool required.
• Fits 2000-2011 Mercury Grand Marquis, N/A, with 190A or 200A alternator; installation tool required.
• Fits 2003-2004 Ford Grand Marquis, N/A, with 190A or 200A alternator; installation tool required.

What It Helps Address

• Alternator pulley noise during engine speed changes
• Accessory belt vibration and oscillation
• Belt wear caused by abrupt deceleration loads
• Premature stress on related belt-drive components
• Harsh engine feel associated with charging-system drag

Installation Notes

Use the required installation tool, part number 91024-3, for proper removal and installation. Confirm alternator output rating and pulley style before ordering, since these applications use a decoupler pulley and not a one-way clutch. Verify belt routing, groove count, and bore dimensions against the original part before service.

Quality Assurance

Gates manufactures the DriveAlign line as OE Exact replacement hardware for charging-system service. This part cross-references Dayco 892002 for the same application.