Re: Bow Thruster Service

James Alton

Bill is right about being careful in heating grp.  Grp can delaminate/crack and thereby destroying the strength of the material if too much heat is applied.  I used to build GRP stack sampling equipment that could barely handle 350F..not much.

SV Sueno
Budva,  Montenegro 

Sent from Samsung tablet.

-------- Original message --------
From: CW Bill Rouse <brouse@...>
Date: 8/28/19 7:21 PM (GMT+01:00)
Subject: Re: [AmelYachtOwners] Bow Thruster Service


You should be very, very careful with heat because the Bow Thruster Tube and case is made of GRP, not metal. 

The contact point is Cast Iron to the GRP tube. The problem is a result of NOT replacing the lip-seal and foam donuts, and possibly leaving the bow thruster down while sailing or motoring. Saltwater has passed through the seals and has caused corrosion on the electric motor base which is made of Cast Iron. This corrosion (Iron Oxidation) has reduced the size of the opening for the tube at the base of the motor. Your photos show that this has been more than a little saltwater over a long time, possibly months/years. It is going to be very difficult to separate the tube from the motor base. You will need the tool designed by Amel, plenty of penetrating fluid and 3-4 days of constant pressure to cause separation. You can use some light tapping or vibration on the cast iron motor base intermittently while constant pressure is applied with the special tool. But take care not to strile the base too hard because it is made of cast iron.

I recommend that you closely check the lower bearing on the electric motor because I suspect it is also damaged.

In the future, replace the seals every 2 years...also replace the 0.3 liters of 80/90 Gear Oil when you replace the seals. Always use plenty of waterproof grease at the contact points of the tube and motor base.

This is the normal materials needed for service every 2 years (contact SAV"at"
You will certainly get other advice, but I firmly believe that you will not get better advice.


CW Bill Rouse
720 Winnie St
Galveston Island, TX 77550
+1(832) 380-4970

On Wed, Aug 28, 2019 at 12:03 PM Matt Salatino via Groups.Io <> wrote:
A little heat?


On Aug 28, 2019, at 9:44 AM, "jlm@..." <jlm@...> wrote:

Hi !

I had the  same problem ... You need a lot of patience, mutch WD40 and patience, do not forcing, do not break the threads, the contact is bronze on stainless  ...

I needed 2 days ...

good luck



Hold time 2 or 3 days with WD40, WD40 and much

Le 28/08/2019 à 18:35, Bernd Spanner a écrit :
I wanted to change the seal on the bow thruster today.
Unforunately after removing the 4 screws I could not get the shaft disconnected. It’s badly rusted all over. Any ideas how I can loosen it?? Already used some wd40 & caramba to get it loose.... no success 
Pics attached
Best regards, 
SN 119 / Cascais, Portugal

Garanti sans virus.

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