Tensioner Pulley for Drive Belt Ford 1L2Z-8678-AD

Accessory Drive Belt Tensioner Pulley Ford 1L2Z-8678-AD

Safe Operation of the Auxiliary Drive System

The Genuine Ford Tensioner Pulley 1L2Z-8678-AD (also known by Motorcraft code YS-385) is a critically important component of the engine's accessory drive system. This part is responsible for maintaining constant and correct tension of the serpentine belt, which powers the alternator, water pump, power steering pump, and air conditioning compressor. Using a Genuine OEM pulley prevents belt slippage, eliminates extraneous noises (squealing, rattling), and protects the bearings of auxiliary units from premature wear caused by improper load distribution.

Premium Quality and Canadian Manufacturing

This pulley is manufactured at Ford facilities in Canada, guaranteeing compliance with the strictest North American quality standards. The body of the part is made of high-strength alloy steel with a black anti-corrosion coating. A precision-sealed ball bearing, filled with specialized synthetic grease, is installed in the center. This design allows the pulley to operate stably at critical engine RPMs and under extreme temperatures within the engine bay. The smooth working surface of the pulley undergoes high-precision machining, minimizing friction and extending the service life of the backside of the drive belt.

Replacement and Maintenance Recommendations

Experts recommend checking the condition of the 1L2Z-8678-AD pulley during every scheduled maintenance service. The primary signs of a needed replacement include the appearance of play when rocking the pulley by hand, traces of grease leaking from under the bearing seal, or a characteristic hum during engine operation. Installing a new original Ford pulley restores the factory performance parameters of the tensioning mechanism and ensures quiet, trouble-free operation of all vehicle systems. The part is fully interchangeable with engineering number 1L2E-19A216-AD and catalog number 6755958.

Detailed Vehicle Compatibility

The pulley is designed for Ford, Lincoln, and Mercury vehicles equipped with Modular V8 4.6L and 5.4L engine families, as well as certain V6 and V10 versions:

• Ford Explorer: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

• Ford Expedition: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014

• Ford F-150: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

• Ford Mustang: 2005, 2006, 2007, 2008, 2009, 2010

• Ford E-150 / E-250 / E-350 Econoline: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014

• Ford Excursion: 2000, 2001, 2002, 2003, 2004, 2005

• Ford Crown Victoria: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011

• Lincoln Navigator: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014

• Lincoln Town Car: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011

• Mercury Grand Marquis: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011

• Mercury Mountaineer: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

Technical Specifications

• Brand: Ford

• Brand Registration Country: USA

• Condition: New

• Product Group: Drive belt pulleys

• Purpose: Tensioning and direction of auxiliary drive belt

• Material: Steel

• Color: Black

• Weight: 395 grams

• Outer Diameter: 76 mm

• Pulley Width: 33 mm

• Inner Bore Diameter: 17 mm

• Part Number (OEM): 1L2Z-8678-AD

• Motorcraft Number: YS-385

• Engineering Number on part: 1L2E-19A216-AD

• Ford Catalog Number: 6755958

• Part Type: Genuine OEM

• Compatibility: V8 4.6L / 5.4L, V10 6.8L engines

• Bearing Type: Single-row sealed ball bearing

• Pulley Surface: Smooth (non-ribbed)

• Package Includes: Pulley assembly with pressed-in bearing — 1 pc

• Features: Reinforced steel construction, dust-proof bearing seal

• Country of Manufacture: Canada (Made in Canada)

• Installation Type: Fits automatic tensioner or idler bracket

• Service Life: Up to 100,000 km mileage (depending on operating conditions)