Workhorse W8002567 Engine Cooling Fan Clutch Drive

The Workhorse W8002567 Engine Cooling Fan Clutch Drive is a genuine original equipment manufacturer (OEM) thermal viscous fan clutch assembly engineered specifically for GM 4.8L, 6.0L, and 8.1L Vortec engines built on Workhorse chassis. It is primarily utilized in heavy-duty applications like Workhorse W22 and W24 motorhomes and P42, W42, and W62 step vans.
Because RVs and commercial step vans carry significant weight, this clutch utilizes a specific heavy-duty thermal engagement profile tailored to managing the immense heat generated under heavy loads or when climbing steep grades.

Technical Specifications & Engagement Rules

• Air-Temperature Activated: The viscous coupling engages based on the temperature of the air passing through the radiator, not the internal engine coolant temperature.
• Engagement Profile: It begins initial engagement at approximately 178°F (81°C) air temperature past the hub, and achieves full engagement at 201°F (94°C). On the dashboard, you will typically notice the famous "fan roar" locking in when engine coolant temperatures reach 205°F to 210°F.
• Torque Specs: Fan-to-clutch bolts should be torqued to 17 ft-lbs, and the clutch-to-water pump hub interface torqued to 41 ft-lbs.
• Compatibility: It is designed to match the 20-inch fan blade (Part # W8002568). It supersedes the older kit number W0007657.