Kia Optima: Cylinder Block / Cylinder Block

Kia Optima DL3 2019-2024 Service and Repair Manual / Engine Mechanical System / Cylinder Block / Cylinder Block

Repair procedures

Use fender covers to avoid damaging painted surfaces.

To avoid damaging the cylinder head, wait until the engine coolant temperature drops below normal temperature (20°C [68°F]) before removing it.

When handling a metal gasket, take care not to fold the gasket or damage the contact surface of the gasket.

To avoid damage, unplug the wiring connectors carefully while holding the connector portion.


Mark all wiring and hoses to avoid misconnection.

Turn the crankshaft pulley so that the No.1 piston is at TDC (Top dead center).


Remove the engine assembly from the vehicle.

(Refer to Engine and Transaxle Assembly - “Engine and Transaxle Assembly”)


Remove the transaxle assembly from the engine assembly.

(Refer to Automatic Transaxle System - "Automatic Transaxle")


Remove the drive plate.

(Refer to Cylinder Block - "Drive Plate")


Remove the rear oil seal.

(Refer to Cylinder Block - “Rear Oil Seal”)


Install the engine to engine stand for disassembly.


Remove the timing chain.

(Refer to Timing System - “Timing Chain”)


Remove the water pump assembly.

(Refer to Cooling System - “Water Pump”)


Remove the water inlet fitting and the thermostat assembly.

(Refer to Cooling System - “Thermostat“)


Remove the intake manifold.

(Refer to Intake and Exhaust System - "Intake Manifold")


Remove the A/C compressor.

(Refer to Heating, Ventilation Air conditioning -"Compressor")


Remove the exhaust manifold.

(Refer to Intake and Exhaust System - "Exhaust Manifold")


Remove the cylinder head assembly.

(Refer to Cylinder Head Assembly - "Cylinder Head")


Remove the oil filter.

(Refer to Lubrication System - “Engine Oil”)


Remove the oil screen.

(Refer to Lubrication System - “Oil Pan”)


Remove the piston and connecting rod assemblies.

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


Remove the crankshaft.

(Refer to Cylinder Block - "Crankshaft")


Remove the knock sensor.

(Refer to Engine Control/Fuel System - "Knock Sensor (KS)")


Remove the crankshaft position sensor (CKPS).

(Refer to Engine Control/Fuel System - "Crankshaft Position Sensor (CKPS)")


Remove the oil pressure switch.

(Refer to Lubrication System - "Oil Pressure Switch")


Remove gasket material.

Using a gasket scraper, remove all the gasket material from the top surface of the cylinder block.


Clean cylinder block

Using a soft brush and solvent, thoroughly clean the cylinder block.


Inspect top surface of cylinder block for flatness.

Using a precision straight edge and feeler gauge, measure the surface contacting the cylinder head gasket for warpage.

Flatness of cylinder block gasket surface

Standard :

Less than 0.05 mm (0.0020 in.) for total area

Less than 0.02 mm (0.0008 in.) for a section of 100 mm (3.9370 in.) X 100 mm (3.9370 in.)


Inspect the cylinder bore

Visually check the cylinder for vertical scratches.

If deep scratches are present, replace the cylinder block.


Inspect the cylinder bore diameter.

Using a cylinder bore gauge, measure the cylinder bore diameter at position in the thrust and axial direction.

Cylinder bore diameter :

81.00 - 81.03 mm (3.1890 - 3.1902 in.)


Measure position points (from the top of the cylinder block):

10 mm (0.3937 in.) / 71 mm (2.7953 in.) / 131.5 mm (5.1772 in.)


Assemble the other parts in the reverse order of disassembly.


In case the cylinder block is replaced with a new one, select the proper crankshaft main bearing and the piston according to the crankshaft journal bore mark and the cylinder bore mark on the cylinder block.

Crankshaft main bearing selection

(Refer to Cylinder Block - "Crankshaft")

Piston selection

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

Components and components location Components 1. Crankshaft upper bearing 2. Crankshaft thrust bearing 3. Crankshaft 4. Crankshaft lower bearing 5. Cr ...

Cylinder Head Assembly
Components and components location Components 1. Camshaft bearing cap 2. Camshaft front bearing cap 3. Exhaust camshaft 4. Intake camshaft 5. Exhaust CVV ...

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