Description
KB799381X – DRIVEMASTER FAN CLUTCH (WESTERN STAR / MBE4000)
PART NUMBER(S):
Fleet Products: KB799381X (Remanufactured) | OE: Horton 989381, Kit Masters 99381, Mercedes 99A9381
DESCRIPTION:
Model: Horton DM Advantage (Remanufactured)
Vehicles: Western Star (2004–2006)
Engines: Mercedes-Benz MBE4000 (also used in Freightliner, Volvo, Sterling, Navistar, and Mack platforms)
• Engagement Type: Pneumatic Air On/Off – Spring Engaged (2-Speed DM Advantage)
• Back Pulley Diameter: 7.50″
• Overall Length: 10.48″
• Belt Configuration: 8PK (1-belt, 8-groove serpentine)
• Belt Groove Location: 1.38″
• Fan Pilot Diameter: 2.56″
• Fan Blade Bolt Circle: 3.5″
• Vertical Mounting Distance: 10.0″
• Horizontal Mounting Distance: 2.36″
• Fan Drive Bolt Pattern: 6x, 3/8-24 Thread, 0.81″ Long
• Application Use: Heavy-duty cooling for MBE4000 diesel engines in highway and vocational trucks
Applications:
Is this fan clutch compatible with your Mercedes-Benz MBE4000-powered Western Star✔ Yes—built for 2004–2006 Western Star models, this remanufactured Horton DM Advantage ensures precise cooling and reliability. Trusted across OEM platforms including Freightliner, Volvo, Navistar, Sterling, and Mack fleets using MBE4000 engines.
CROSS-REFERENCE(S):
12930926901, 3443-99381, 3443-993812, 3912-79A9381, 3912-999381, 3912999381, 799381, 79A9381, 79A9381RMAN, 989381, 98A9381, 99381, 999381, 999381-HO, 999381H0R, 999381HO, 99A9381, 99a9381, ABP N20 99381, ABP N20 993812, ABPN2099381, ABPN20993812, FLT99381, FLT993812, HOR 79A9381, HOR 999381, HOR79A9381, HOR999381, KM N20 99381, KM N20 993812, KMI99381, KMI993812, KMN2099381, KMN20993812, PFC FLT99381, ZBH79A9381, ZBH999381A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm pulley size (8.55″) and bolt circle (3.5″) before installation
✔ Verify fan pilot diameter (2.56″) and stud length (1.05″) to ensure compatibility
✔ Replace all O-rings, gaskets, and seals with new components during installation
✔ Apply thread locker and torque bolts to OEM specifications to prevent vibration
✔ Test clutch engagement before returning vehicle to service and inspect fan blades for balance
Drivemaster On/Off Repair Kits:
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
