The Konrad PRSIII is the best alternative for the aging MERCRUISER Speedmaster III* series drives.  It has greatly simplified the conversion process of the SSMIII, with just a few easy steps.  Most conversions can be completed in a matter of just a few hours. The Konrad PRSIII is delivered as a complete kit including all necessary components to complete the installation in a trouble free manner

PRSIII Duty Classification 

High Performance
Maximum operation

• 100 hours per year for high performance applications at highly intermittent operation.
• Gross weight to horsepower less than 12.2 kg/kw (20 lbs./hp).
• No warranty.

PRSIII Material/Manufacturing Specifications 

Bearings
Tapered roller bearings, spaced for optimum load carrying capabilities, support the shafts

Castings
Manufactured from high strength, heat treated aluminum

Gears
High strength heat treated alloy steel utilizing high performance marine technology

Shafts
Manufactured from high alloy, heat treated steel

U-Joint
Industry leading size for increased load carrying capacity and extended life

PRSIII Installation/Operational Specifications

Application
High Performance

Corrosion
Protection Multiple anodes, all castings chromatized and layered with powder coatings

Engine Coupling
Standard SSMIII/A tailpiece coupling

Exhaust
None through the stern drive

Gear Ratios
1.21:1, 1.33:1, 1.51:1, and 1.69:1

Lubrication
Full immersion, six quarts with external reservoir

Propeller
425 mm (16.75")

Rotation
Offered in either right or left hand rotation

Steering Angle
40° range

Torque Rating
Up to 1000 Nm (738 lb. ft.) input for recreational, lower for commercial applications

Transmission
Reversing transmission required

Transom Mounting
Template available

Transom Requirements
14° angle nominal, 6.4 mm - 57.2 mm (1/4 in - 2-1/4 in) thick

Trim/Lift System
Approximate –6° to +10° trim, twin cylinders with electro hydraulic pump. Approximate 40° of total lift range

Water Pickup
None through the stern drive

PRSIII Package Options 

Standard Equipment (Supplied with stern drive)

• 540 HD upper housing assembly
• 540 HP lower housing assembly
• HD bell housing (with bellows)
• External Steering back cover

Options for individual applications (Available for purchase from Konrad)

• X-Factor lower housing assembly
• Drive extension/spacer kits
• HP upper gear set
• Tie bars
• Propellers
• 42 oz. HP oil reservoir
•  Stern Drivelifting bracket