Luk LMC617 Clutch Master Cylinder

Clutch Master Cylinder for Manual Transmission Service

The LuK LMC617 clutch master cylinder is a new hydraulic replacement for manual transmission clutch release systems. It includes a push rod and installation instructions, and it is supplied dry, without a pre-filled fluid charge or pre-bled assembly.

Built from LuK’s experience in the transition from mechanical to hydraulic clutch actuation, this clutch master cylinder supports precise pedal-to-hydraulic transfer for service work on manual transmission vehicles. It is a direct-fit replacement for applications that use the LMC617 design, including select Honda Civic and Acura Integra fitments where specified.

Key Features

• Brand: LuK
• Part number: LMC617
• Clutch master cylinder for manual transmission components
• New part construction
• Push rod included
• Installation instructions included
• Not pre-filled with fluid
• Not pre-bled
• Supplied without clutch slave cylinder

Product Details

LuK has extensive engineering background in hydraulic clutch release systems, and that experience is reflected in the LMC617. This master cylinder is intended for vehicles that rely on hydraulic clutch actuation and need a replacement unit that restores consistent clutch pedal pressure and fluid movement. If you are servicing a Honda Civic clutch master cylinder or an Acura Integra hydraulic clutch system, the LMC617 is a relevant OE-style replacement reference to verify against the original part.

This part cross-references Dayco 72617 and Dorman - First Stop CM640078 for the same application.

What It Helps Address

• Soft or inconsistent clutch pedal feel
• Hydraulic fluid leakage at the master cylinder
• Difficulty disengaging the clutch
• Pedal travel issues caused by worn internal seals
• Loss of hydraulic pressure in the clutch release circuit

Installation Notes and Tips

Install the LMC617 according to the included instructions and verify all hydraulic connections before operation. Because this unit is not pre-filled and not pre-bled, the system will need to be filled and bled after installation. Confirm vehicle-specific fitment, mounting points, and push rod engagement before final assembly on Honda Civic or Acura Integra applications.

Quality Assurance

LuK is part of Schaeffler’s clutch and drivetrain engineering portfolio, with long-standing experience in hydraulic clutch release system development. The LMC617 is a new replacement part built for manual transmission service and supplied as a complete master cylinder assembly with the listed included components.