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Old 14-11-2015, 20:59   #1
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Join Date: Aug 2005
Location: NSW Central Coast
Boat: Lagoon 410 (now sold)
Posts: 514
Yanmar and Volvo Saildrive prop nut modification

Rabbi posted a PDF instruction on a simple modification to saildrives to reduce the risk of the prop falling off. Thanks Rabbi.

As this was buried in a thread about a prop not fitting on a Lagoon 380, I have created this fresh thread that will be more easily identifiiable for saildrive owners.

I completed this easy modification on both my SD20's. The 8mm threaded rod in 316 stainless was only $10 for a metre length from a small hardware store. After cutting the lengths off, I ground flat surfaces in the middle so a shifter can turn the rod easily. The marina had stainless tube and cut me off 2 small pieces. Then you only need nuts & washers plus Loctite or similar.

One observation I made was the tightening torque for the prop nut. The PDF shows only a small rotation from handtight, and I did not think this felt sufficient (how tight is handtight anyway?). So I torqued a bit tighter.

It was at this point I realised a downside with this modification. When I was removing the props before the mod, I could not undo the cone nuts with my basic tools. They both needed a stronger bar with extension arm for extra leverage. Now with this modification, there is no way to pass such a bar through the cone nut, potentially making removal more difficult.

Also, the retention system replaces a long Loctited bolt with a washered nyloc nut (in addition to the cone nut) - not sure if this is really better or not.

The boat gets splashed in a week, so I'm wondering if others have made this modification or have opinions on it.
Wanderlust is offline   Reply With Quote

sail, saildrive, volvo, yanmar

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