** Mercury MerCruiser Stern Drive Unit for outdrive alpha one R-MR-Alpha One Alpha One SS Complete Service Manual for the Mercury Mercruiser Sterndrive Units "R" - "MR" - "Alpha One" & "Alpha One SS" 566 pages and 18.35 MG of very well detailed easy to read troubleshooting, rebuilding, servicing, maintenance and repair information complete with many charts, diagrams, schematics, specifications and pictures. This manual covers all aspects of servicing this equipment in a very clear and concise format with the convenience of having all this information at your fingertips. This manual will allow you to completely troubleshoot, disassemble, inspect, repair and reassemble your equipment. Models Covered In This Manual Model & Serial Number MC 120R / 140B / 185R / 488R / 898R / 228R / 260R - Serial No. 6216687 6849289 MC 120MR / 140MR / 170MR / 185MR / 190MR / 200MR / 230MR / 260MR / 300 Tempest MR - Serial No. 6849290 0A471374 MC Alpha One / Alpha One SS - Serial No. 0A471375 and Above Contents As Follows Section 1 - Important Information A - Important Information B - Maintenance C - Troubleshooting Section 2 - Removal, Installation and Adjustments A - All Models Section 3 - Sterndrive Unit A - Drive Shaft Housing B - Gear Housing - MR/Alpha One/Alpha One SS C - Gear Housing - I-R D - Gear Housing - Alpha One Counter Rotation Section 4 - Transom Assembly A - Service Procedures Requiring Minor Disassembly B - Service Procedures Requiring Major Disassembly Section 5 - Power Trim A - Oildyne Power Trim Pump (Plastic Reservoir) B - Oildyne Power Trim Pump (Aluminum Reservoir) C - Prestolite Power Trim Pump D - Trim Cylinders E - Dual Power Trim Control F - Auto Trim II Section 6 - Steering Systems A - Power Steering B - Manual Steering Section 7 - Corrosion Protection A - All Models