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Thermal; Severe Duty

Hayden makes four different types of thermal fan clutches; Standard, Heavy Duty, Severe Duty and Truck Fan Drives. Each type is engineered to simulate the performance, fit and appearance of the original equipment clutch that it replaces. All fan clutches are for specific applications and should only be applied for which they are cataloged. Use of the wrong fan clutch may result in poor cooling, excess noise, reduced mileage, or fan clutch failure.

Features & Benefits of Severe Duty Thermal Fan Clutch
  • Turns the fan 80-90% of the shaft speed when engaged
  • Turns the fan 20-30% of the shaft speed when disengaged
  • Used with deeper pitch fans. (2-1/2" of pitch)
  • Land and groove design with up to 72 Sq. In. of working area
  • Larger working surface provides cooler running and longer life expectancy
  • Thicker body and deep finned faceplate dissipate more heat
  • Can be used in place of many heavy-duty clutches

Symptoms of Fan Clutch Problems

  • Poor cooling at low speed but good cooling at high speeds
  • Poor air conditioning at low speeds
  • No increase in fan noise when engine is hot

Installation Note

Manufacturers recommend inspecting your Water Pump and replacing it (if needed) at the same time you replace your Radiator Fan Clutch. The parts are connected by the same shaft, and a loose or damaged Radiator Fan Clutch can also cause the Water Pump to fail.

Standard Duty vs Heavy Duty vs Severe Duty
Bolt Quantity6
Bolt ThreadM8 x 1.25 Hole
Clutch Maximum Diameter (IN)7.4
Clutch TypeD - Severe Duty & Truck Fan Drive
ColorRaw Aluminum in Color
DescriptionFan Clutches
Distance From Clutch To Mounting Flange (IN)1.76
Drawing TypeD
Duty RatingSevere
Electronic Clutch?Non Electronic
Fan Bolt Circle (in)6
Fan Bolt Circle (mm)152.4
Fan Mount Dia. (in)5
Fan Mount Dia. (mm)126.9
Fan Mount Height (mm)44.7
Meets / Exceeds OEM?Yes
Mount Dia. (in)3.22
Mount Dia. (mm)82
Mounting Hardware?Not Included
Mounting Hole Quantity6
Mounting TypeFlange
New or RemanNew
O.E. Replacement?Yes
Overall Height (in)4.08
Overall Height (MM)103.6
Performance Rated?Yes
Pilot Dia. (in)0.75
StyleSevere Duty
Alternate/OEM Part Number(s): 15591496, 15671935, 15956343, 15969543, 15991496

Warranty Information:
12 Months / 12,000 Miles
Warranty Details