TPD1317e Chapter 2 Machining Procedure 1. Bore to size (dimension ‘A’). 2. Broach keyway 4.0” long (dimension 3. Split, 0.135 Max. width (dimension 4. Clamp the coupling to the propeller shaft in the position shown. 5. Drill 15/32” Diameter hole through the propeller shaft and far side of the coupling, using the starter hole (dimension ‘D’). 6. 0.5005-0.4990 Diameter ream through both the coupling and shaft. 7. Dismantle and clean, then assemble. Figure 3 - Twin Disc gearbox couplings Page Dimensions in inches A B C D E F G H I J K 1.25 0.31 1.39 Drill 15/32 Ream 0.5005-0 5.75 3.0 3.4 1.12 4.25 3.12 4.76 1.38 0.31 1.52 1.50 0.38 1.67