Luk DMF138 Clutch Flywheel

LuK DMF138 Dual Mass Flywheel

The LuK DMF138 is a clutch flywheel built as a dual mass flywheel for select Hyundai and Kia applications. It is engineered to match the vehicle-specific tuning of the original LuK design, helping reduce drivetrain stress compared with a solid flywheel setup.

Compatible with 2009-2010 Kia Optima, 2010-2012 Kia Forte, 2013 Kia Forte Koup, 2011-2013 Kia Sportage, 2009-2010 Hyundai Sonata, and 2010 Hyundai Tucson, this LuK DMF138 flywheel is specified for direct replacement use in the listed applications.

Key Features

• Dual mass flywheel design for smoother drivetrain operation
• Flywheel diameter: 24 in. (9.449 in. listed)
• Flywheel inner diameter: 14.7 in. (5.787 in. listed)
• Flywheel cup depth/step height: -0.524 in. (-13.3 mm listed)
• 110-tooth ring gear specification
• OE-style fitment for select Kia Forte, Kia Sportage, Hyundai Sonata, and Hyundai Tucson applications

Detailed Description

LuK DMF138 is a dual mass clutch flywheel designed for vehicles that require the damping characteristics of a DMF rather than a solid flywheel. The flywheel is individually tuned for the application, helping control torsional vibration and reduce the mechanical load transferred through the clutch and transmission system. For drivers and technicians servicing a Kia Forte, Kia Sportage, Hyundai Sonata, or Hyundai Tucson, the DMF138 provides the correct flywheel geometry and tooth count for the listed fitments.

This part cross-references OE-style numbers such as 2320025210 and 4150775100 for the same application. The LuK DMF138 is also referenced by part number DMF91182 and NDMF138.

What It Helps Address

• Excess drivetrain vibration at idle and under load
• Premature wear on engine mounts from torsional shock
• Gearbox stress associated with solid flywheel conversions
• Crankshaft damage risk linked to uncontrolled vibration transfer
• Clutch engagement issues caused by worn or damaged flywheel damping components

Installation Notes and Tips

Verify the flywheel diameter, inner diameter, step height, and 110-tooth specification before installation. Inspect the clutch assembly, release components, and mounting surfaces during service, and confirm the replacement matches the vehicle’s original DMF configuration. Proper torque procedures and clean mating surfaces are important for reliable operation.

Quality Assurance

LuK is known for original-equipment-style dual mass flywheel engineering, and the DMF138 follows that application-specific approach for the listed Hyundai and Kia vehicles. Use this part when the vehicle calls for a DMF rather than a solid flywheel to maintain the intended drivetrain damping characteristics.