Part of maintaining our Yanmar 4JH45 diesel engines and SD60 sail drives is making sure our output seals and O-ring are changed when required. I did ours while we were hauled out in Trinidad and created this video has a helpful DIY resource.
In it, I cover how to remove and replace the SD60 output seals and O-rings before reinstalling it into the sail drive leg.
The SD60 sail drive is compatible with a range of Yanmar engines including the 3JH5E, 3JH40, 4JH5E, 4JH45, 4JH4-TE, 4JH57, and 4JH80. These engines are installed on a variety of different boats including Leopard Catamarans, Seawind and Lagoon.
Tools, parts and consumables
These are the main tools and consumables I used to complete the job. Most we already had aboard our Leopard 45.
8mm hex bit socket with a 3/8 inch driver
Homemade bearing race removal tool
Hammer
100% brass bristle brush
15W 40 sail drive oil
Thread locker
For parts, I used the Yanmar output seal kit which has correct number of seals and O-rings all together in a single set.
Yanmar O-Ring AND Output Seal Kit 796460-02950 (1 kit per side)
Alternatively you can buy each part separately.
Yanmar O-Ring 96460-02630
Yanmar Output Seal 196460-02620
We usually buy our Yanmar parts from Toad Marine as they stock genuine items and ship to various locations.
Advice for removing the bearing race
This is a close up photo of the aluminum tool I made to help remove our bearing race without damaging the components. The hole in the metal was already there as this was a scrap piece of metal we had laying around, it's the hand shaped sloped end that is the key part.
You could use a correctly sized socket and extension but this can carry a small chance of cracking the bearing race. We chose to avoid this by making a specialized tool which we're keeping aboard for future services.
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