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Boat Damper Drive Plate 12AA4
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R&D Drive Plate | 17 Teeth Spline | PRM | 155.45mm Diameter | 100 lb ft Torque

Part No. RND-12AA4

This R and D drive plate is no longer available in this specification, it has been replaced by R and D part number 12AM4. Please contact us for further details.

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Overview
Brand R&D Marine
Element High Deflection
Gearbox Model PRM Delta
Suitability Newage PRM Delta Gearbox
Gearbox Spline Spline: 17 teeth 24/48DP
Diameter 155.45mm (6.125")
Torque 135Nm 100 ft lb
Bolt Hole PCD (Pitch Circle Diameter) 5 x 6.35mm holes (0.25") on 142mm PCD (5.593")
Number of Fixing Holes 5
Thickness 32mm (1.25") Maximum
Replaces PRM Drive Plate MT8075
Description

12AA4 Boat Engine Damper Drive Plate from R&D Marine

Fitted between the boat engine and the gearbox input shaft, a damper drive plate is designed to transmit the engine power to the gearbox, whilst reducing transmitted gear noise and providing a cushioned drive when selecting gear. All R and D Damper Drive plates include a 'failsafe' design.

Also called the Driven Plate, Damper Plate or Clutch Plate, the 12AA4 Damper Drive Plate is from the R and D High Deflection element range. Common applications for the 12AA4 drive plate include BMC, Ford and Perkins engines which have a flywheel with the 6.125" diameter fixings aperture. It can also replace PRM drive plate MT8075.

The technical details:
Spline: 17 teeth 24/48DP (19.7mm diameter) for Newage PRM Delta gearbox.
Diameter of drive plate back plate which bolts to the engine flywheel: 155.45 mm 6.125"
Back plate fixing holes: The small back plate has 5 x 6.35mm holes (0.25") on 142mm PCD (5.593). This was a very common fixing arrangement for BMC, Leyland, Thornycroft and Perkins engines
Drive plate maximum thickness: 32mm (1.25")
Fitted with the softer type AA high deflection element for 135Nm 100 ft lb torque, providing a maximum deflection up to 30 degrees. This type of drive plate is especially suited to workboats with slow speed applications & pleasure boats. Note that this type of damper drive plate can only be fitted to rotate in the standard direction of rotation (anti-clockwise when looking at the flywheel) with the drive plate element facing the gearbox. These damper plates are also failsafe.

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