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Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Mechanical (WRX-STI)) >> V-belt >> Inspection >> Front Side Belt

Front Side Belt

WARNING: This page is about a different variant/trim than selected.
CAUTION: Check and adjust the front side belt tension so that it is within the specified range. Using the belt with a tension out of the specified range may result in a fault such as the following:
  • If the front side belt tension is higher, unexpected force is generated at the power steering oil pump, generator and crankshaft bearing, causing abnormal noise due to abnormal wear of the bearing.
  • If the front side belt tension is lower, the front side belt and crank pulley slip, causing abnormally high temperature on the crank pulley due to frictional heat. If this condition repeatedly occurs, the front side belt may abnormally wear, causing abnormal noise, front side belt damage or crank pulley damage.
  1. Replace the front side belt, if crack, fraying or wear is found.
  2. Check the front side belt tension and adjust it if necessary by changing the generator installing position.

    Front side belt tension (with belt tension gauge): 

    When installing new parts 

    640 - 780 N (65 - 80 kgf, 144 - 175 lbf) 

    At inspection 

    490 - 640 N (50 - 65 kgf, 110 - 144 lbf) 

    Fig 1: Engine Drive Belt Routing Diagram
    G10290348Courtesy of SUBARU OF AMERICA, INC.

    Front side belt tension (without belt tension gauge): 

    When installing new parts 

    7 - 9 mm (0.276 - 0.354 in) 

    At inspection 

    9 - 11 mm (0.354 - 0.433 in) 

    Fig 2: Checking Front Side Belt Tension (Without Belt Tension Gauge)
    G10290349Courtesy of SUBARU OF AMERICA, INC.
  3. Start the engine and confirm that the V-belt rotates smoothly and no abnormal noise is emitted.