Part of the Yanmar Operator Manuals.
Milky oil in a saildrive leg is the kind of find that ends a season, and the only honest answer to it is the inspection schedule Yanmar actually printed. That schedule lives in publication 0ASDM-G00101, the factory operation manual for the SD20, SD50 and SD50-4T sail-drives, matched at the factory to the 1GM10C, 2YM15, 3YM20, 3YM30 and the 3JH and 4JH series diesels.
With it you can fit and torque a propeller to the published figure instead of a guess (a guessed nut torque is how props leave the boat), fill the leg to the correct capacity, run the break-in properly, and work the cone clutch, diaphragm and anode intervals that keep water out of the gearcase.
It is an 86 page bookmarked PDF. Print the torque charts and the maintenance table, take them to the boat, and let them get oily.
Complete the set for your SD20, SD50, SD50-4T
- Repair Manual: Yanmar SD40–SD50 Series Sail Drive Unit Service Manual
Other edition of this manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | Sail-Drive Models, Engine Models, Engine and Sail-Drive Combinations |
| Safety | 7-12 | Safety Precautions (Before You Operate, During Operation and Maintenance) |
| Product Overview | 13-18 | Overview (Owner / Operator Responsibilities, New Sail-Drive Break-In, Dealer / Distributor Responsibilities, Component Identification, Galvanic Corrosion, Corrosion Control, Shore Power, Underwater Drive Coating) |
| Before You Operate | 19-28 | Propeller Selection (Recommended Propeller Size, Fitting a Fixed Propeller), Lubricating Oil (Filling with Lubricating Oil - SD20, SD50 and SD50-4T) |
| Sail-Drive Operation | 29-34 | Remote Control Device Check, Sd20, Sd50 / Sd50-4T, Engine Cooling Water (Sd20) |
| Periodic Maintenance | 35-56 | Tightening Fasteners, Torque Charts, Periodic Maintenance Table, When the Vessel Is Out of the Water, Perform the Following:, Periodic Maintenance Procedures |
| Specifications | 57-58 | Reduction Gear System, Direction of Rotation, Reduction Ratio, Lubricating Oil Capacity, Dry Weight, Remote-Control Device |
| System Diagrams | 59-86 | Maintenance Log |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SD20 | ||
| Propeller Nut Tightening Torque, SD20 | 60 to 70 N·m (44 to 52 lb-ft) | p. 21 |
| Dry Weight, SD20 | 30 kg (66 lb) | p. 57 |
| Reduction Ratio (Ahead) | 2.64 | p. 57 |
| SD50, SD50-4T | ||
| Propeller Nut Tightening Torque (SD50, SD50-4T) | 80 to 100 N·m (59 to 74 lb-ft) | p. 21 |
| Lubricating Oil Capacity (Long-Reach Unit, Extension 100) | 2.45 L (2.6 qt) | p. 23 |
| All Models | ||
| Cone Clutch Inspection/Lapping Interval | Every 500 hours | p. 40 |
| Cone Clutch Replacement Interval | Every 2000 hours | p. 40 |
| Rubber Diaphragm Inspection Interval | Every Year | p. 40 |
| Rubber Diaphragm Replacement Interval | Every 5 Years | p. 40 |
| SD20, SD50, SD50-4T | ||
| Lubricating Oil Capacity (Standard Unit) | 2.2 L (2.3 qt) | p. 23 |
| SD50 | ||
| Dry Weight, SD50 | 39 kg (86 lb) | p. 57 |
| SD50-4T | ||
| Dry Weight, SD50-4T | 41 kg (90 lb) | p. 57 |
