Product Details
Severe Duty Thermal Engine Cooling Fan Clutch (2791) by Hayden®. Rotation: Reverse. Hayden Automotive engineers, manufactures and supplies a wide range of products designed to keep your car, truck or performance vehicle running cool. From fan clutches and electric fans to performance oil and transmission coolers, we’ve got what you need to protect your vehicle from damaging and performance robbing heat. Hayden Automotive - products engineered and built to take the heat, so your vehicle won’t.
Specifications
| Overall Height: 3.77" |
| Overall Height: 95.6mm |
| Diameter: 6.45" |
| Mounting Hole/Stud Qty: 1 Bolt |
| Quantity: 4 Bolt |
| Thread: 5/16-18 Hole |
| Clutch Type: D - Severe Duty & Truck Fan |
| Type: Drive |
| Color: Raw Aluminum in Color |
| Duty Rating: Severe |
| Electronic Fan Clutch: No |
| Fan Bolt Circle: 3.25" |
| Fan Bolt Circle: 82.6mm |
| Material: Aluminum |
| Mount Dia.: 1.44" |
| Mount Dia.: 36mm |
| Mount Type: Hex |
| Mounting Hardware Included: Not Included |
| New or Remanufactured: New |
| Overall Dia.: 6.45" |
| Overall Dia.: 163.8mm |
| Overall Width: 6.45" |
| Overall Width: 163.83mm |
| Performance Rated: Yes |
| Pilot Depth: 0.7" |
| Pilot Depth: 17.8mm |
| Pilot Dia.:1.18" |
| Rotation: REV |
| Style: Severe Duty |
| Type: Thermal |
Features
- Turns the fan 80-90% of the shaft speed when engaged
- Turns the fan 20-30% of the shaft speed when disengaged
- Land and groove design with 70 sq. in. of working area
- Used with deeper pitch fans (2 -1/2° of pitch)
- Larger working surface ensures cooler running and longer service life
- Thicker body and deep finned faceplate dissipate more heat
- Can replace many heavy-duty clutches
A fan clutch is the part of the cooling system that powers up the fan blades. Each time your engine gets too hot, the clutch fully engages the fan. This allows the fan to blow the right amount of air onto your radiator for maximum cooling. Once the operating temperature of the engine goes down or the engine starts operating at a normal temperature, the clutch partially disengages the fan to save more power.
There are two types of fan clutches, non-thermal and thermal. Thermal fan clutches are a little more sophisticated and operate in response to underhood temperatures. A bi-metal thermal spring mounted at the front of the clutch senses the underhood temperature and operates the fan clutch accordingly. When the engine is cold, the fan is disengaged, providing fuel economy and noise reduction. When too much heat is generated, the clutch allows the fan to rotate really fast to cool the engine faster. The thermal fan clutch is engaged on a cold startup because the fluid drains into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as a result of a pumping action produced by a difference in speed between the shaft and clutch body. Thermal fan clutches are available in standard duty, heavy duty, and severe duty options. If your fan spins excessively when the engine is stopped, the A/C performance is poor at idle or low vehicle speeds, or you feel vibration that increases with the engine speed, these are the signs of the failed fan clutch. Replace it with premium product from Hayden.
Located in Grapevine, Texas, Hayden® Automotive is a leading manufacturer of automotive, truck, and performance cooling parts. For over 55 years, the company provides both OE and performance cooling products designed to protect any street car, off-road truck, or performance vehicle from power-robbing heat. Continuous investment in technology allows Hayden to develop premium products that feature the highest quality and durability. The company's commitment to quality includes both TS16949 and ISO2001 certifications. From idler and belt tensioner pulleys to transmission and engine oil coolers, Hayden has everything a vehicle owner needs to keep their vehicle running cool.