Re: Bowthruster - damaged hex-nut

David Vogel

Yes, agree! It is when the rust gets a hold – perhaps due to the leaking compression and lip seals – that the hex-bolts and motor-spline interfaces become a problem. If ever there was ever a case of “a stitch in time, saves nine”, then this is one of them. I was keeping an eye on things and thought that, in the absence of any leakage into the bow-thruster compartment, that everything was all OK. And it was, until it wasn’t …

BTW, the set of multi-spline extractors arrived just after we splashed back, and now we’ve left Perigee (for the first time in 5 years) for a Christmas ashore. Upon our return in the New Year, we’ll try again to budge that recalcitrant hex-head bolt with the new tools …

In the interim, expressing thanks for all the help and assistance received from our cohort of AMELians over the past 12 months, and wishing you all the very best for this Festive Season, and beyond.

David & Lenny
SM#396, Perigee
Whangarei, NZ

From: <> on behalf of Bill Kinney <cruisingconsulting@...>
Reply-To: <>
Date: Wednesday, 22 December 2021 at 2:01 pm
To: <>
Subject: Re: [AmelYachtOwners] Bowthruster - damaged hex-nut [count on drilling out that bolt and re-tapping the hole + TORX]


There is nothing bad about changing to TORX head bolts for this, but the ability to exert torque on the head really is not the issue.  If the bolts are kept well greased (or otherwise treated) and exercised regularly (every year or two) there is never any reason that they should be more than barely tight.  When well maintained, they will always come out without a struggle.  It’s only when rust and corrosion take over that they get hopelessly difficult!

All of the Amel thrusters have an excellent system for keeping these bolts in place doing their job even if they are only finger tight.  The exact way this was accomplished varied, depending on the build date. 

Bill Kinney
SM160, Harmonie
Fort Lauderdale, FL, USA

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