🔩 Centre Coupling / Coupling Flange – Leyland L/L 1613 Turbo
The centre coupling flange (sometimes called the centre joint coupling flange) is a key driveline component used in multi‑section propeller shaft assemblies on heavy trucks. Its purpose is to join two propeller shaft sections or connect an intermediate shaft to the front/rear shaft while allowing slight movement and torque transmission. This part is essential in models that use a centre bearing and a two‑piece propeller shaft (e.g., Leyland L/L 1613 Turbo).
📌 Application
Vehicle: Leyland L/L 1613 Turbo
Component: Centre Coupling / Centre Joint Coupling Flange
Design: Round flange with serrated engagement for positive torque transfer and vibration resistance.
⚙️ Typical Specifications (Aftermarket Reference)
(based on standard parts listings such as KKI Autos catalog)
Parameter
Value / Description
Part Type
Centre Coupling (Centre Joint Coupling Flange)
Shape
Round flange
Plate Diameter
~150 mm (~6″)
Total Height
~63 mm
Bolt Holes
4
Splines
10 splines (engagement surface)
Oil Seal Size
~56 mm provision (if applicable)
Catalog Part Code
CF 755 — Centre Coup. L/L 1613 Turbo
Application Fits
Leyland L/L 1613 Turbo, also used in some Eicher variants.
🛠️ Function in the Drivetrain
✔ Torque Transmission: The centre coupling joins the front and rear sections of the propeller shaft, allowing continuous torque flow from the gearbox to the differential.
✔ Flexible Engagement: The serrated or splined surface ensures a positive mechanical lock between mating halves, reducing slip and backlash under load.
✔ Accommodation of Movement: Allows relative movement due to chassis flex or suspension travel, protecting drivetrain components and improving longevity.