Mercury and Mariner Outboard TorqueMaster 1 Gearcase Parts Diagrams

This page is designed to help boaters, mechanics, and commercial fishermen locate high-quality replacement parts for 2004-2013 Mercury & Mariner 3.0L V6 Optimax ProXs Torquemaster 1 gearcases. We provide detailed parts diagrams to help you find the correct seal kits, gear sets, bearing carriers, shafts, shift components, water pump housings, and other components for your gearcase. Whether you need to service, rebuild, or repair your gearcase, replace worn bearings, or repair a leaking seal, this page provides the part numbers and category links to obtain the correct components.  OBParts ensures quality, compatibility, and expert advice to get you back on the water!

The following parts correspond to the numbers on the diagram above:

1. Gearset 1.75 Ratio
2. Clutch Dog
3. AFT Carrier Bearing
4. Top Driveshaft Bearing
5. Lower Driveshaft Bearing
6. Pinion Bearing
7. Reverse Gear Bearing
8. Outer Forward Gear Bearing
9. Driveshaft
   - 13 Spline 20" (L) 1 Piece Double Bearing
   - 13 Spline 25" (XL) 1 Piece Double Bearing
10. Driveshaft Retainer
11. Pinion Nut

 We also offer the following items:

• Complete Gearcase Rebuild Kit
• Seal Kit
• Water Pump Kit
• Bearing Kit