Kia Optima: Cylinder Head Assembly / Cylinder Head Cover

Kia Optima DL3 2019-2025 Service and Repair Manual / Engine Mechanical System / Cylinder Head Assembly / Cylinder Head Cover

Components and components location

Components

1. Cylinder head cover

2. Cylinder head cover gasket

Repair procedures

Removal

•	Use fender covers to avoid damaging painted surfaces.

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

Mark all wiring and hoses to avoid misconnection.

1.	Remove the engine cover. (Refer to Engine and Transaxle Assembly - "Engine Cover")

2.	Disconnect the battery negative terminal.

3.	Disconnect the wiring connectors and harness clamps and remove the connector brackets around the cylinder head cover.

4.	Remove the air cleaner assembly. (Refer to Intake and Exhaust System - "Air Cleaner")

5.	Remove the ignition coils. (Refer to Engine Electrical System - “Ignition Coil”)

6.	Remove the engine oil level gauge. (Refer to Lubrication System - “Oil Level Gauge & Pipe”)

7.	Disconnect the positive crankcase ventilation (PCV) hose (A).

Remove the cylinder head cover (A).

Unfasten the bolts in the sequence as shown.

Installation

Install cylinder head cover.

(1)	The hardening sealant located on the cylinder head cover and the gap between the timing chain cover and the cam carrier should be removed before assembling cylinder head cover.

(2)	Apply engine oil on the lip portion of the oil seal on the cover and outer surface of the spark plug pipes.

(3)

After applying sealant on the gap between the timing chain cover and the cam carrier, it should be assembled within 5 minutes.

Bead width : 2.0 - 3.0 mm (0.08 - 0.12 in.)

Sealant : Threebond 1217H or equivalent

(4)

Install the cylinder head cover by tightening the bolts, in several passes, in the sequence as shown.

Tightening torque

1st step :

3.9 - 5.9 N•m (0.4 - 0.6 kgf•m, 2.9 - 4.3 lb•ft, 34.5 - 52.1 Ib•in)

2nd step :

7.8 - 9.8 N•m (0.8 - 1.0 kgf•m, 5.8 - 7.2 lb•ft)

•	Do not reuse cylinder head cover gasket.

•	Before installing the cylinder head cover, make sure the cylinder head cover gasket is not separated from the cylinder head cover gasket groove.

•	The engine running or pressure test should not be performed within 30 minutes after the cylinder head cover was assembled.

2.	Install the other parts reverse order of removal.

Cylinder Head Assembly

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