Dayco 17620 Accessory Drive Belt

Dayco 17620 Accessory Drive Belt Overview

The Dayco 17620 accessory drive belt is a top-cog, synthetic rubber belt built for accessory drive applications that demand consistent grip and stable operation. With a 62-inch effective length and 36-degree angle, it is a direct replacement option for select Ford, Lincoln, Mercury, and Cadillac applications, including fan, air conditioning, idler, and power steering drives.

• Synthetic rubber compound construction for durable everyday service
• Top-cog design helps the belt flex smoothly around pulleys
• Black finish with a .53-inch top width
• Effective length: 62 in. / 1574.80 mm
• Outside circumference: 62.27 in. / 1581.66 mm
• Operating temperature range: -35 to 175 degrees
• Built to SAE J636 and SAE J637 standards

Fitment and Application Details

Compatible with select 1976-1987 Ford, Lincoln, Mercury, and Cadillac vehicles where the accessory drive layout calls for this belt size. Fits 1983-1987 Ford E-250 Econoline Club Wagon, fan and air conditioning; Fits 1983-1987 Ford E-350 Econoline, fan and air conditioning; Fits 1983-1987 Ford E-350 Econoline Club Wagon, fan and air conditioning; Fits 1983-1987 Ford F-250, fan and air conditioning; Fits 1983-1987 Ford F-350, fan and air conditioning; Fits 1982 Cadillac Commercial Chassis, air conditioning and power steering; Fits 1982 Cadillac Fleetwood, air conditioning and power steering; Fits 1977-1980 Lincoln Versailles, air conditioning and idler; Fits 1976-1979 Mercury Monarch, air conditioning and idler; Fits 1977-1978 Ford LTD, air conditioning and idler; Fits 1978 Mercury Grand Marquis, air conditioning and idler; Fits 1978 Mercury Marquis, air conditioning and idler.

This part cross-references Gates 9620 and ACDelco 9620HD for the same application. Search Dayco 17620 when replacing a worn accessory drive belt on Ford F-250, Ford F-350, or Mercury Monarch applications.

What This Belt Helps Address

• Squealing or slipping accessory drive belt noise
• Cracking, glazing, or visible wear on the belt ribs
• Loss of belt tension affecting fan, A/C, idler, or power steering operation
• Drive issues caused by an aging belt in high-heat engine bay conditions
• Replacement needs during routine accessory drive service

Installation Notes and Tips

Verify belt length, width, and pulley routing against the vehicle’s accessory drive layout before installation. Inspect pulleys, tensioners, and idlers for wear or misalignment, since those conditions can shorten belt life and affect tracking. Confirm the application by vehicle year, make, model, and position before ordering the Dayco 17620.

Quality Assurance

Dayco manufactures this belt to SAE J636 and SAE J637 standards, with a synthetic rubber compound and top-cog construction selected for accessory drive service. The Dayco 17620 is specified for select Ford, Lincoln, Mercury, and Cadillac applications where the listed dimensions and routing match the original belt requirement.