Engine Assembly
Repair Procedures
Removal
Remove the engine cover.
(See Engine and Transaxle Assembly - Engine Cover)
Disconnect the negative battery cable.
Remove the battery and battery tray.
(Refer to Engine Electrical System - Battery)
Remove the air cleaner assembly.
(See Intake and Exhaust System - Air Cleaner)
Remove the engine room cover.
(See Engine and Transaxle Assembly - Under Hood)
Drain the engine coolant.
(Refer to Cooling System - "Engine Coolant")
Disconnect the upper radiator hose (A).

Disconnect the radiator lower hose (A).

Recover the refrigerant, then remove the high-pressure pipe and low-pressure pipe.
(See Heating, Ventilation and Air Conditioning - Compressor)
Disconnect the wiring harness connectors, control cables, and ATF cooler hoses (A/T only) from the transaxle.
(Refer to Automatic Transmission System - Automatic Transmission)
Disconnect the heater hose (A).

Disconnect the brake booster vacuum hose (A).

Disconnect the fuel hose (A) and the purge control solenoid valve (PCSV) hose (B).

Remove the wiring harness from the engine compartment.
Disconnect the main wiring harness connectors of the fuse block (A).

Disconnect the wire cable of the fuse block (A), and then remove the main wiring protector (B).
Tightening torque: 7.8–9.8 N·m (0.8–1.0 kgf·m, 5.7–7.2 ft-lbf)

Remove the front muffler.
(See Intake and Exhaust System - Muffler)
Remove the idler arm bracket (A).
Tightening Torque
Bolt (B):
107.9–127.5 N·m (11.0–13.0 kgf·m, 79.6–94.0 ft-lbf)
Bolts (C):
49.0–63.7 N·m (5.0–6.5 kgf·m, 36.2–47.0 ft-lbf)

Remove the roller rod bracket (A).
Tightening torque: 49.0–68.6 N·m (5.0–7.0 kgf·m, 36.2–50.6 ft-lbf)

Remove the subframe.
(Refer to Suspension System — "Subframe")
Support the engine and transaxle assembly with a lift table.
Disconnect the engine ground cable.
Tightening torque: 10.8–13.7 N·m (1.1–1.4 kgf·m, 8.0–10.1 ft-lbf)
Remove the engine mount support bracket (A).
Tightening torque: 88.3–107.9 N·m (9.0–11.0 kgf·m, 65.1–79.6 ft-lbf)

Disconnect the transaxle ground line (A).

Remove the mounting side panel seal (A).

Remove the transmission mounting bolts (A).
Tightening torque: 107.8–127.4 N·m (11.0–13.0 kgf·m, 79.5–94.0 ft-lbf)

Remove the engine and transmission assembly (A) by raising the vehicle.

Installation
Installation is the reverse of removal.
Do the following:
Fill the engine with engine oil.
Fill the transmission with fluid.
Fill the radiator and the coolant reservoir with engine coolant.
Set the heater control lever to the "HOT" position.
Bleed air from the cooling system.
Start the engine and let it run until it warms up (until the radiator fan cycles 3 or 4 times).
Turn the engine off. Check the radiator level and add coolant if necessary. This allows air trapped in the cooling system to be removed.
Securely close the radiator cap, then restart the engine and check for leaks.
Clean the battery terminals and cable terminals with sandpaper, reconnect them, then apply grease to prevent corrosion.
Inspect for fuel leaks.
After assembling the fuel line, turn the ignition switch ON (do not crank the starter) so that the fuel pump operates for approximately two seconds and the fuel line is pressurized.
Repeat this operation two or three times, then check for fuel leaks at all points of the fuel line.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.