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Home >> Kia >> 2020 >> Optima EX Premium >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 47 (Lubrication System - 2.4L (Except HEV)) >> Balance Shaft & Oil Pump >> Repair Procedures >> Installation >> BSM (Balance Shaft Module) Chain System

BSM (Balance Shaft Module) Chain System

WARNING: This page is about a different variant/trim than selected.
  1. The key of crankshaft should be aligned with the mating face of main bearing cap. As a result of this, the piston of No. 1 cylinder is placed at the top dead center on compression stroke.
  2. Insert a stopper pin (A) on the BSM to hold the sprocket at the reference position with the timing mark (B) aligned with the timing notch (C).
    G12932505Courtesy of KIA MOTORS AMERICA, INC.

    Information 

    New BSM has already been installed with a stopper pin at the reference position.

  3. Match the timing marks of balance shaft chain sprocket (A) and balance shaft chain (B), then install the balance shaft chain (C).
    G12932506Courtesy of KIA MOTORS AMERICA, INC.
  4. Install the BSM (Balance Shaft Module).
    1. Match the timing marks of balance shaft chain sprocket (A) and balance shaft chain (B), then install the balance shaft sprocket on the chain.
      G12932507Courtesy of KIA MOTORS AMERICA, INC.
    2. Tighten the bolts with seating torque 29.4 N.m (3.0 kgf.m, 21.7 lb-ft) and then loosen the bolts.
    3. Using the SST (Torque Angle Adapter, 09221-4A000), tighten the bolts with specified tightening torque and angle.

      Tightening torque 

      Bolts (A) (M9x181.5): 22.6 - 26.5 N.m (2.3 - 2.7 kgf.m, 16.6 - 19.5 lb.ft) + 88° - 92°

      Bolts (B) (M9x100): 22.6 - 26.5 N.m (2.3 - 2.7 kgf.m, 16.6 - 19.5 lb.ft) + 43° - 47°

      NOTE: Do not reuse the BSM bolts.
    G12932508Courtesy of KIA MOTORS AMERICA, INC.
    Fig 1: BSM Bolts Tightening Sequence
    G12932509Courtesy of KIA MOTORS AMERICA, INC.
  5. Install the balance shaft chain guide (D).

    Tightening torque: 

    9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

  6. Install the balance shaft chain tensioner arm (C).

    Tightening torque: 

    9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

  7. Install the balance shaft chain tensioner (B) then remove the stopper pin (A).

    Tightening torque: 

    9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

    G12932510Courtesy of KIA MOTORS AMERICA, INC.
  8. Remove the stopper pin (A) of balance shaft module.
    G12932511Courtesy of KIA MOTORS AMERICA, INC.
  9. After rotating crankshaft 2 revolutions in regular direction (clockwise viewed from front), confirm that the timing mark and notch are aligned at the reference position.
  10. Install the other parts in the reverse order of removal.