SD50
Cone-clutch Yanmar saildrive with a 2.32:1 reduction for the JH4 and JH5 diesels up to 75 hp, including the SD50-4T/SD50-T turbo variant; replaced by the SD60.
The SD50 shares its design with the SD40: a bevel gear set with a cone clutch and a 2.32:1 reduction ahead and astern, with inner and outer diaphragm seals and a water sensor. Yanmar's datasheets give a dry weight of 40 kg (42 kg for the SD50-T); the 2004 operation manual gives 39 kg and 41 kg. The SD50 was offered with the 3JH4E and 4JH4E and later the 3JH5CE and 4JH5CE, while the turbocharged 4JH3-TCE and 4JH4-TCE used the SD50-4T (called SD50-T on datasheets), which Yanmar specifies with Quicksilver High Performance Gear Lube.
The SD50 was still in Yanmar's line-up in 2013 but was replaced by the SD60, which switched to a multi-plate clutch; the first Yanmar document found listing the SD60 on these engines is the JH-series operation manual of 2014.
Sources
- 1. SD-Series Sail-Drive Operation Manual, models SD20, SD50/SD50-4T (copyright 2004) — Yanmar
- 2. Yanmar Saildrive SD50 / SD50-T datasheet (with 3JH5CE, 4JH5CE, 4JH4-TCE) — Yanmar (via ABC Power Marine)
- 3. Yanmar Saildrive SD50 'The Powerful Gem' datasheet (with 3JH4CE) — Yanmar (via LSM Diesel)
- 4. Service Manual Sail Drive Unit SD40/SD40-4T, SD50/SD50-4T (M2215-04E140) — Yanmar
- 5. Drive systems (saildrives, ZT370, pod drives, gears datasheet list), 2013 capture — Yanmar Marine
- 6. JH Series Operation Manual 4JH45, 4JH57, 4JH80, 4JH110 (0AJHC-M00011, 2014) — Yanmar
Specifications compiled from manufacturer sources.