KIA Niro: Crankshaft

  1. Check the crankshaft bearing oil clearance.

(1) To check main bearing-to-journal oil clearance, remove the lower crankcase and lower bearings.

(2) Clean each main journal and bearing with a clean shop towel.

(3) Place one strip of plastigage across each main journal.

(4) Reinstall the lower crankcase and lower bearings, and then tighten the main bolts.

Tightening torque : (17.7 - 21.6 N*m (1.8 - 2.2 kgf*m, 13.0 - 15.9 lb*ft) + (88 - 92º)



  • Always use new crankshaft main bearing cap bolts. Crankshaft main bearing cap bolts are torque-toyield bolts designed to be permanently elongated beyond the state of elasticity when torqued. Reusing
    the removed bolts can cause the bolts to break or fail to maintain clamping force.
  • Do not turn the crankshaft.

(5) Remove the lower crankcase and lower bearings.

(6) Measure the width of the plastigage at its widest point.

Oil clearance :

Standard :
0.006 - 0.024 mm (0.0002 - 0.0009 in)

Limit :
0.018 - 0.044 mm (0.0007 - 0.0017 in.)

(7) If the plastigage measures too wide or too narrow, remove the upper and

(7) If the plastigage measures too wide or too narrow, remove the upper and lower bearing and then install a new bearings with the same color mark. Recheck the oil clearance.


Do not file, shim, or scrape the bearings or the caps to adjust clearance.

(8) If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing. Recheck the oil clearance.


  • If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.
  • If the marks are indecipherable due to an accumulation of dirt and dust, clean with solvent or detergent instead of scrubbing them with a wire brush or scraper.


     Crankshaft Bore Identification Mark

    Letters are been stamped on the block as a mark for the size of each of the 5 main journal bores. Use them, and the numbers or bar stamped on the crank (marks for main journal size), to choose the correct bearings. Cylinder Block Specifi

     Cylinder Block Repair procedures

    Warning Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries. Be sure t

     Cylinder Head Assembly


     Specifications & Consumer information (Kia Niro EV)

    Dimensions Electric vehicle specifications OBC: On-Board Battery Chargers Volume and weight Available front trunk weight Air conditioning system Please contact a professional workshop for more details. Kia recommends to co

     High Voltage System

    Vehicle components 12V auxiliary battery The 12V auxiliary battery is located in the right side of the luggage room, and powers all of the vehicle's standard electronics like radio, air conditioner, etc. Also, it powers the HPCU (Hybrid