Kia Forte BD Quiz
Engine Mechanical System

Crankshaft

In this manual: Engine Mechanical System
General Information — 8Maintenance — 32Engine Mechanical System — 47Engine Electrical System — 17Emission Control System — 10Engine Control System/Fuel System — 32Clutch System — 11Manual Transmission — 11DCT (Dual Clutch Transmission) System — 16Drive Shaft and Axle — 8Suspension System — 26Steering — 9Restraints — 11Brake System — 27Body (Interior and Exterior) — 119Body Electrical System — 98Heating, Ventilation, and Air Conditioning — 27
30steps
~180min
4/5difficulty
0102030405021.616N·mlb·ft
Tightening torque found on this page
Done 0 of 30

Components and Component Location

Components

1. Crankshaft sprocket
2. Crankshaft thrust bearing
3. Upper crankshaft main bearing
4. Crankshaft		 5. CKPS wheel
6. Lower crankshaft main bearing
7. Crankshaft main bearing cap
8. Pilot bearing (double clutch transmission (DCT) only)

Repair Procedures

Disassembly

  1. Remove the engine and transaxle assembly from the vehicle.

    (See Engine and Transaxle Assembly - Engine and Transaxle Installation)

  2. Remove the transaxle assembly.

    Manual Transaxle System:

    (See Manual Transaxle System - Manual Transaxle)

    DCT (Dual Clutch Transmission) System:

    (See DCT (Dual Clutch Transmission) System - DCT (Dual Clutch Transmission))

  3. 3. Remove the flywheel.

    (See Cylinder Block - Flywheel)

  4. Remove the rear oil seal.

    (See Cylinder Block Assembly - Rear Oil Seal)

  5. Install the engine assembly on an engine stand for disassembly.

  6. Remove the intake manifold.

    (See Intake and Exhaust System - Intake Manifold)

  7. Remove the exhaust manifold.

    (See Intake and Exhaust System - Exhaust Manifold)

  8. Remove the timing chain.

    (See Timing System - Timing Chain)

  9. Remove the cylinder head assembly.

    (See Cylinder Head Assembly - Cylinder Head)

  10. Remove the oil cooler.

    (See Lubrication System - Oil Cooler)

  11. Remove the oil pan and oil screen.

    (See Lubrication System - Oil Pan)

  12. Remove the ladder frame (A).

  13. Remove the piston and connecting rod assembly.

    (Refer to Cylinder Block Assembly - Piston and Connecting Rod)

  14. Inspect the crankshaft main bearing oil clearance.

  15. Remove the main bearing caps (A).

  16. Check the crankshaft end play.

  17. Remove the crankshaft (A) from the cylinder block, taking care not to damage the journals.

  18. Remove the CKPS wheel (A) from the crankshaft.

Inspection

Pilot Bearing

  1. Inspect the pilot bearing.

    1. Make sure the pilot bearing (A) is not visibly damaged.

    2. Check for noise by rotating the inner race (A) of the pilot bearing.

    3. If damage or noise is found, replace the crankshaft together with the pilot bearing.

Crankshaft

  1. Check the oil clearance of the crankshaft main bearings.

    1. To check the main bearing oil clearance, remove the main bearing caps with their lower bearings.

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

    3. Place one strip of Plastigage on each main journal.

    4. Install the main bearing caps with their lower bearings in place, then tighten the bolts.

      Tightening torque: 17.7–22 N·m + 88 – 92°

    5. Remove the main bearing caps and lower bearings again, then measure the widest part of the Plastigage.

      Main bearing oil clearance No. 1, 2, 3, 4, 5: 0.020–0.041 mm (0.0008–0.0016 in.)

    6. If the Plastigage is too wide or too narrow, remove the upper and lower bearings, then install new bearings with the same color code. Re-check the oil clearance.

    7. If the Plastigage indicates that the clearance is still incorrect, try the next larger or smaller bearing. Recheck the oil clearance.

    8. Select the bearing using the selection table.

      Letters are stamped on the side of the block as a marking for the size of each of the 5 main journal bores.

      Use them, and the numbers or letters stamped on the handle (main journal bore size marks), to correctly select the bearings.

      Crankshaft Main Bearing Selection Table

      crankshaft main bearing Crankshaft Main Journal Bore Mark on Cylinder Block
      A B C
      Crankshaft main journal mark 1 E (Red/Yellow) D (Green) C (None)
      2 D (Green) C (None) B (Black)
      3 C (None) B (Black) Blue)

      Cylinder Block Crankshaft Journal Bore Inspection

      Mark Cylinder block journal bore inside diameter
      A or 1 52.000 - 52.006 mm
      (2.0472–2.0475 in.)
      B or 2 52.006 - 52.012 mm
      (2.0475–2.0477 in.)
      C or 3 52.012 - 52.018 mm
      (2.0477–2.0479 in.)

      Crankshaft Main Journal Inspection

      Mark Outer diameter of the crankshaft main journal
      1 47.954–47.960 mm
      (1.8879–1.8882 in.)
      2 47.948–47.954 mm
      (1.8877–1.8879 in.)
      3 47.942–47.948 mm
      (1.8875–1.8877 in.)

      [Enter]

      Mark on upper surface

      [Type B]

      Mark on lower surface

      Crankshaft Main Bearing Inspection

      Grade Color Thickness of the crankshaft main bearing
      A Blue 2.026–2.029 mm
      (0.0798–0.0799 in.)
      B Black 2.023–2.026 mm
      (0.0796–0.0798 in.)
      C None 2.020–2.023 mm
      (0.0795–0.0796 in.)
      D Green 2.017–2.020 mm
      (0.0794–0.0795 in.)
      E Red-Yellow 2.014–2.017 mm
      (0.0793–0.0794 in.)

  2. Check the crankshaft end play.

    Using a dial indicator, measure the crankshaft thrust clearance by prying the crankshaft forward and rearward with a screwdriver.

    Crankshaft Thrust Clearance

    Standard: 0.05–0.25 mm (0.0020–0.0098 in.)

    Limit: 0.30 mm (0.0118 in.)

    If the thrust clearance is greater than specified, replace the center bearing.

Installation

  1. When replacing, check whether the pilot bearing (A) is installed in the crankshaft or the engine.

    If it is not installed, be sure to install the pilot bearing (A).

  2. Install the CKPS wheel (A).

    Tightening Torque: 9.8–10.7 N·m

  3. Install the crankshaft main bearings.

    1. Align the bearing tab with the tab groove of the cylinder block, and insert the 5 upper bearings (A).

    2. Align the bearing tab with the tab groove of the main bearing cap (B), then insert the five lower bearings (A).

    3. Apply a coat of engine oil after installing the main bearings.

  4. Install the thrust bearings (No. 3 journal).

    Install the 2 thrust bearings (B) on both sides of the No. 3 journal of the cylinder block with the oil groove (A) facing outward.

  5. Install the crankshaft to the cylinder block.

    Apply a coat of engine oil to the pins and main journals after assembling the crankshaft.

  6. Install the main bearing caps and tighten the main bearing cap bolts.

    1. Apply a thin coat of engine oil to the bolt threads. Tighten all bolts to the specified torque in numerical order first, then tighten all bolts to the specified angle in numerical order.

      Tightening torque: 17.7–22 N·m + 88° – 92°

      Using SST (09221 - 4A000), tighten the main bearing cap bolts (A).

    2. Make sure the crankshaft rotates smoothly.

  7. Check the crankshaft end play.

  8. Install the piston and connecting rod assembly.

    (Refer to Cylinder Block Assembly - Piston and Connecting Rod)

  9. Install the oil pan frame.

    1. Apply liquid sealant to the ladder frame.

      Bead width: 2.5–3.5 mm (0.0984–0.1378 in.)

    2. Install the oil pan frame (A).

      Tightening torque: 18.6 – 24 N·m

  10. Install the remaining parts in the reverse order of removal.

Test yourself

A quick Kia Forte BD quiz: every answer comes with an explanation and a link to the manual page.