520 Stern Drive

Konrad's 520 is the original stern drive that was introduced in 1997. Since then, the 520 has continued to prove its hardworking dependability time and time again under the most demanding circumstances:

intended for military, commercial, medium duty, and recreational performance the konrad 520 offers

  • Oversized bearings
  • Thicker walled casings
  • One piece propeller shaft
  • Continuous oil circulation for cool operation
  • No corrosive exhaust through drive
  • Precision machined super alloy gears
  • No failure-prone cone clutch
  • Minimal maintenance required

analysis form

Every application is analyzed and approved by Konrad Application Engineers.  Please complete the Analysis Form and submit it online, or download the PDF to print, scan, email, or mail back to Konrad.  A Konrad Application Engineer will contact you to discuss your priorities and goals and determine the best Konrad sterndrive model for you.  You can also reach out to us anytime. We look forward to working with you!

TECHNICAL INFORMATION

For your convenience, we have downloadable documents that will help with the conversion process.

520 Installation Guide

520 Maintenance Manual

 

Package Options

Standard Equipment (Supplied with Sterndrive)

  • Complete sterndrive assembly
  • Inner and outer transom assembly
  • Trim pump assembly (including trim cylinders)
  • Oil reservoir with low level sensor for use in hull
  • Drive comes full of sterndrive lubricant
  • Two quarts of power trim fluid

Additional Equipment Required (Not supplied but available for purchase from Konrad)

  • Transmission
  • Propeller
  • Steering package
  • Lifting Brackets
  • Drive shafts/transmission tail piece
  • Bellhousing adapter
  • Flywheel coupling
  • Transmission oil cooler
  • Alignment tool

Options for Individual Applications (Available for purchase from Konrad)

  • HD Upper Assemblies
  • Isolator Mounts
  • Installation tool kit
  • Extension kits
  • Tie bars
  • Technical engineering assistance

Material / Manufacturing Specifications

Bearings
Taper 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

Installation / Operational Specifications

Application
Commercial, Military, Recreational, and High Performance

Engine Connection
Direct or Remote (Jack or CV Shaft)

Exhaust
None through the sterndrive

Gear Ratios
1.43:1, 1.57:1, 1.79:1, 1.97:1

Lubrication
Full Immersion, 7 quarts with external reservoir

Propeller
Diameter Range - 17.25 in - 20 in (43.8 cm - 51 cm)

Rotation
Operates in either right or left hand rotation

Steering Angle
56° range

Transmission
Reversing transmission required

Transom Mounting
Template available per application

Transom Requirements
14° angle nominal, 6.4 mm - 76.2 mm (1/4 in - 3 in) thick

Trim/Lift System
Approximate -6° to +10° trim, twin cylinders with electrohydraulic pump
Approximate 30° of total lift range

Water Pickup
None through the sterndrive

Warranty

All applications and warranties are subject to evaluation and approval by the factory and may be approved with lower annual hours than noted maximum.

500 Series Warranty Manual