Details

• Brand:

  

  

• SKU:

  LC3Z-8678-C

• Positions: Upper, Upper Front, Right Upper, Right Front
• Other Names:

  Serpentine Idler Pulley, Kit Tension Pulley, ys384

• Description:

  This is a brand new genuine Ford OEM tension pulley kit carrying part number LC3Z-8678-C, fitting 20-25 F-250 and F-350 Super Duty trucks and 21-25 E-350 Super Duty cutaway vans in the configurations using this specific tensioner pulley assembly. The kit ships as a complete pulley assembly with bearing, hub, and mounting flange pre-installed, intended as a direct replacement for the worn factory tensioner pulley. Tension pulleys on heavy-duty engines see heavy cyclic loading from the spring-loaded automatic tensioner arm; bearing failure or surface wear typically presents as audible chirp, growl, or visible belt walk. Always replace the tension pulley as soon as bearing roughness is detected, because a failed tension pulley will rapidly destroy the serpentine belt. When replacing, also inspect the tensioner arm pivot for excessive play and check that the tensioner spring still produces the factory-specified force; weak tensioner springs are a common companion failure. Sold as a kit; the tensioner arm body, spring, and damper are separate service items. Verify engine option and chassis by VIN before ordering, since the 8678 idler family covers many suffix variants. Backed by Ford's OEM parts limited warranty.

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