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Yanmar & Volvo Saildrives in Australia
A saildrive is not an engine — it is the leg that takes an engine’s output straight down through the hull. On most Australian production cruising yachts it is the component that will cost you the most and worry you the least until it does not.
The common legs
Yanmar SD20, SD25 and SD60, and Volvo Penta 130S and relatives, under a very large share of the Jeanneau, Beneteau, Bavaria, Hanse, Lagoon and Fountaine Pajot fleet.
The diaphragm is the whole subject
The leg passes through a hole in the hull, and what keeps the sea out is a rubber diaphragm clamped between the leg housing and the hull.
It has a manufacturer-specified replacement interval measured in years, not hours, and changing it is a haul-out job requiring the leg to be separated from the hull.
On a second-hand production cruiser, its date is the single most important thing to establish, and “I don’t know” is the usual answer. See how to check a saildrive diaphragm.
The other four things
Leg anodes. An aluminium casting in warm Australian marina water, consumed fast, protecting something worth more than a full engine service.
Antifouling. Copper-based antifouling on a bare aluminium leg causes exactly the corrosion the anodes are fighting. Aluminium-safe systems and correct priming matter.
Leg oil. Milky means water is entering, usually past the lower seal behind the propeller. Fishing line wrapped behind the prop is a very common cause.
The engine and leg are a family. Repowering a saildrive boat generally means staying within the drive manufacturer’s range, or accepting hull and mounting work. See how a saildrive works.
Frequently asked questions
How often should a saildrive diaphragm be replaced? At the manufacturer\u2019s interval for your leg, which is time-based rather than hours-based. Treat unknown history as overdue.
Can the diaphragm be changed in the water? No. It is a haul-out job.
Why is my leg oil milky? Water is entering, most often past the lower seal behind the propeller. Fishing line is a common cause.
Can I antifoul the leg normally? No. Copper-based antifouling on bare aluminium causes corrosion. Use an aluminium-safe system with correct priming.
Can I fit a different engine brand to my saildrive? Not straightforwardly. The leg and engine are a family, and changing brand usually means changing the leg and hull mounting.
Australian engine profile
How Yanmar & Volvo Saildrives fits the market
Yanmar & Volvo Saildrives is classified here as saildrive system. Confirm the exact model, generation and duty rating before comparing it with another engine or propulsion system.
- Equipment class
- Drive system—not an engine
- Engine type
- Saildrive system
- Australian fleet context
- Saildrive legs — their own maintenance regime
- Compare first
- Match the leg to the engine, hull, propeller and manufacturer service schedule
Families encountered in Australia
- SD20
- SD25
- SD60
- 130S
The list can include current and legacy equipment; confirm new-engine availability with the Australian distributor.
Sources and verification
This page provides general Australian guidance. The current manual for the exact engine, gearbox or drive remains the authority for procedures, specifications and service intervals.
- 1Engine mounts
- 2Coupling
- 3Diaphragm
- 4Gear leg
- 5Propeller
Provider directory
Find an appropriately matched provider
We do not yet have enough verified listing detail to claim a direct match for this page. Search the directory, then confirm the exact engine model, work scope, qualifications, insurance and travel area with the business.