2018 Kia Optima Engine Parts

This table covers the Balance shafts. Read more

This group shows a single part: HYUNDAI 233002GGC0.

This table covers the camshafts that open the valves. Read more

HYUNDAI supplies both parts for the 2018 Kia Optima.

This group includes HYUNDAI 241002GTB0 and HYUNDAI 242002GGA0.

This table covers the seals at each camshaft end. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: ELRING 127610.

This table covers the connecting rods between each piston and the crankshaft. Read more

5 Connecting Rod parts are listed for the 2018 Kia Optima, from TOPLINE and HYUNDAI.

Listed part numbers: HYUNDAI 235102GGA0, TOPLINE CRHY22T and TOPLINE CRHY23L, plus the other parts above.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

11 Connecting Rod Bearing parts are listed for the 2018 Kia Optima, from KING ENGINE BEARINGS, TOPLINE, ITM ENGINE COMPONENTS and 1 other brand. ITM ENGINE COMPONENTS 4B2024 carries the "Popular" badge.

In the High Performance grade, KING ENGINE BEARINGS supplies 1 part: engineered beyond original-equipment specification. A representative part number is KING ENGINE BEARINGS CR4634XP.

The Standard Replacement section lists 4 options from KING ENGINE BEARINGS, ITM ENGINE COMPONENTS and TOPLINE — built to original-equipment specification. ITM ENGINE COMPONENTS 4B2024 is listed in this group.

6 ungrouped parts are not assigned to a grade, with the same engine-level match.

This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

15 Conversion / Lower Gasket Set parts are listed for the 2018 Kia Optima, from ENGINETECH, AJUSA, FEL-PRO and 5 other brands. ENGINETECH HY16CSB carries the "Popular" badge.

This table covers the crankshafts that turn piston motion into rotation. Read more

TOPLINE supplies the 3 Crankshaft parts for the 2018 Kia Optima.

Part numbers include TOPLINE CSHY22T, TOPLINE CSHY23R and TOPLINE CSHY11.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

12 Crankshaft Main Bearing parts for the 2018 Kia Optima come from 4 brands — TOPLINE, KING ENGINE BEARINGS, ENGINETECH and 1 other brand. The "Popular" part is KING ENGINE BEARINGS MB5707SI.

The High Performance section: 1 option from KING ENGINE BEARINGS. KING ENGINE BEARINGS MB5771XP is listed in this group.

Standard Replacement: 4 parts, from TOPLINE, KING ENGINE BEARINGS and ITM ENGINE COMPONENTS. A representative part number is KING ENGINE BEARINGS MB5707SI.

7 further parts sit outside the graded sections, with the same engine-level match.

This table covers the sleeves used to restore a grooved crankshaft seal surface. Read more

8 Crankshaft Repair Sleeve parts for the 2018 Kia Optima come from 3 brands — WJB / INMOTION PARTS, BCA and NATIONAL.

Part numbers include BCA NS99157, BCA NS99166 and NATIONAL 99157, among others listed above.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

50 Crankshaft Seal parts for the 2018 Kia Optima come from 13 brands — ELRING, VICTOR REINZ, FEL-PRO and 10 other brands. The "Popular" part is BCA NS224200. A list this long means Crankshaft Seal applications vary by configuration — the notes carry the qualifiers.

This table covers the bolts that clamp the cylinder head to the block. Read more

16 Cylinder Head Bolt parts are listed for the 2018 Kia Optima, from AJUSA, FEL-PRO, TOPLINE and 5 other brands. AJUSA 81045900 carries the "Popular" badge.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

18 Cylinder Head Gasket parts are listed for the 2018 Kia Optima, from AJUSA, ELRING, APEX and 2 other brands. APEX AHG1397 carries the "Popular" badge.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

19 Cylinder Head Gasket Set parts are listed for the 2018 Kia Optima, from AJUSA, ENGINETECH, ELRING and 3 other brands. ENGINETECH HY16HSCWB carries the "Popular" badge.

This table covers the block heaters that warm the coolant or oil in cold weather. Read more

2 Engine Block Heater parts for the 2018 Kia Optima come from KAT'S HEATERS.

Part numbers include KAT'S HEATERS 11812 and KAT'S HEATERS 28812.

This table covers the Engine covers. Read more

7 Engine Cover parts are listed for the 2018 Kia Optima, from TECHPRO and VARIOUS MFR. TECHPRO KI1228157 carries the "Popular" badge. 5 parts fit every engine; the other 2 are engine-specific.

This group includes TECHPRO KI1228157, TECHPRO KI1228162 and TECHPRO KI1228164 and the remaining parts above.

This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

14 Engine Kit Gasket Set parts are listed for the 2018 Kia Optima, from AJUSA, ELRING, TOPLINE and 1 other brand. AJUSA 50423000 carries the "Popular" badge.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

9 Exhaust Valve parts for the 2018 Kia Optima come from 5 brands — MELLING, TOPLINE, HYUNDAI and 2 other brands.

Listed part numbers: HYUNDAI 222122E000, MELLING V5571 and MELLING V5833, plus the other parts above.

This table covers the followers that drive a mechanical fuel pump off the camshaft. Read more

2 Fuel Pump Camshaft Follower parts are listed for the 2018 Kia Optima, from STANDARD MOTOR PRODUCTS and WELLS. 1 part fits every engine; the other 1 is engine-specific.

This group includes STANDARD MOTOR PRODUCTS GDF401 and WELLS 5T5017.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

6 Harmonic Balancer parts are listed for the 2018 Kia Optima, from ATP, HYUNDAI, DAYCO and 1 other brand.

Listed part numbers: ATP 102474, ATP 102422 and DAYCO PB1761N, plus the other parts above.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

6 Intake Manifold parts for the 2018 Kia Optima come from 4 brands — HYUNDAI, SKP, ACKOJA and 1 other brand. The "Popular" part is HYUNDAI 283242GGA0.

This group includes HYUNDAI 283242GGA0, SKP SKA520157 and ACKOJA A520157 and the remaining parts above.

This table covers the Intake Manifold actuators. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

5 Intake Manifold Actuator parts are listed for the 2018 Kia Optima, from HYUNDAI, ACKOJA, DORMAN and 2 other brands. HYUNDAI 283232GGA1 carries the "Popular" badge.

Part numbers include HYUNDAI 283232GGA1, ACKOJA A52770072 and DORMAN 911923, among others listed above.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

17 Intake Manifold Gasket parts are listed for the 2018 Kia Optima, from ELRING, AJUSA, FEL-PRO and 4 other brands. APEX AMS13140 carries the "Popular" badge.

This table covers the Intake Manifold Runner Control Valve solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

2 Intake Manifold Runner Control Valve / Solenoid parts are listed for the 2018 Kia Optima, from SKP and STANDARD MOTOR PRODUCTS.

Part numbers include SKP SKIMRC6 and STANDARD MOTOR PRODUCTS IMRC6.

This table covers the gaskets that seal the Intake Plenum. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Intake Plenum Gasket parts for the 2018 Kia Optima come from ELRING.

Listed part numbers: ELRING 853640 and ELRING 883790.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

11 Intake Valve parts for the 2018 Kia Optima come from 6 brands — MELLING, TOPLINE, HYUNDAI and 3 other brands.

This table covers the mounts that hold the engine to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

8 Motor Mount parts for the 2018 Kia Optima come from 5 brands — PIONEER, WESTAR, SKP and 2 other brands. The "Popular" part is ANCHOR 10047.

The Economy section lists 1 option from SKP — the catalog's value-priced group. SKP SKM10047 is listed in this group.

Standard Replacement: 5 parts, from PIONEER, ANCHOR, DEA / MARMON RIDE CONTROL and 1 other brand. A representative part number is ANCHOR 10047.

2 further parts sit outside the graded sections, with the same engine-level match.

This group includes ANCHOR 10047, SKP SKM10047 and DEA / MARMON RIDE CONTROL A61001 and the remaining parts above.

This table covers the Motor Mount kits. Read more

This group shows a single part: ANCHOR 300877.