Bowthruster not thrusting

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   I notice corrosion on the motor flange. Is the boat in the water now? You may have a leak in the shaft seal of the thruster bearing. That type of leak can find it’s way into the motor. 12 volts will spin the motor but secure it well…it packs a punch.

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Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 13 June 2024 at 12:47
	I notice corrosion on the motor flange. Is the boat in the water now? You may have a leak in the shaft seal of the thruster bearing. That type of leak can find it’s way into the motor. 12 volts will spin the motor but secure it well…it packs a punch.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY

lide Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 25 January 2024 Location: Singapore Status: Offline Points: 30	Post Options Post Reply Quote lide Report Post Thanks(0) Quote Reply Posted: 13 June 2024 at 15:00
	Thanks yes. There was some leakage earlier which has now been fixed. So that's probably the issue. Will open it up to see what we have inside.

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 13 June 2024 at 20:12
	If you can, please post your results along with any pictures. I'm getting hauled out in a few weeks to address my leak/seal & bearing replacements. It would be helpful to know how to assess wider damage/harm before I try to float the boat again. Thanks ... and good luck to you!
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

lide Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 25 January 2024 Location: Singapore Status: Offline Points: 30	Post Options Post Reply Quote lide Report Post Thanks(0) Quote Reply Posted: 24 June 2024 at 02:44
	Hi. Sorry for the delayed response. I just managed to go get some photos. Here they are. To my untrained eye, the flange looks pretty bad. I'd guess the motor shaft is corroded tight. I couldn't turn it by hand. I'd guess that a good motor mechanic may be able to fix it by replacing bearing etc. But can't be sure unless I get it done. And a bowthruster being generally needed only when things get hairy, I'm not sure I'd be comfortable with that kind of fix. I'm getting quotations for a new motor including an upgrade to a 6.3kW. And change the circuit board and helm control while I'm at it. How's your haul out coming along?

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 30 July 2024 at 15:15
	A question for sourcing thruster seals: The BTR185 (used as the stern thruster on the 588) seal kits are QuickUSA part numbers: FVSGGTCC1R18A00 and FVEACBBTR185000. These are stocked in the US. The BTR250 (used as the bow thruster on the 588) seal kit is FVETCBBTR250D00. But, the BTR250 is rarely installed in the US so they don't stock it. And apparently not stocked in Europe either (!). 6-8 week lead time. Anyone find another source either for the kits or the consumable components (seals/o-rings/bearings)? Are they commonly available sizes that someone knows? I'm not near the boat. All of this is based upon the idea that the BTR250 uses a larger diameter shaft than the BTR185 which I can't check. I can't believe that 9 of the 10 projects are complete, and this is the one keeping me on the hard!
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 01 August 2024 at 13:29
	Posting an update on this. I was able to get a list of the components in the Quick BTR250 (Bow thruster on a 588 with an 8.0kW motor) thruster seal kit and determine the specifications for ordering. Oil Seals: Also known in some parts of the world as "shaft seals". You need 1 of each these 3: 20mm (shaft) x 37mm (bore) x 7mm thick 40mm (shaft) x 56mm (bore) x 8mm thick 40mm (shaft) x 68mm (bore) x 10mm thick Bearings (1 of each): Bearing 61904 Bearing 61908 O-Ring (not sure if you need 1 or 2, but they generally come in packs of 10+): UNI sizing it is known as 4175. The dimensions are 44.04mm ID x 3.53mm thickness. I found 123bearings.com had all of these in an easily searchable form and a total cost of ~$50 including shipping, but for those elsewhere, the specifications above are what you need to search. There are 5 other components, but you should be able to salvage them from your current installation: 20mm external elastic ring. Some would know this as a external snap ring that goes onto a shaft. 40mm external elastic ring. Some would know this as a external snap ring that goes onto a shaft. 37mm internal elastic ring. Some would know this as a internal snap ring that goes into a bore. 62mm internal elastic ring. Some would know this as a internal snap ring that goes into a bore. Shaft key: 5mm x 5mm x 15mm
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 20 August 2024 at 20:59
	Continuing saga. I'm hauled out and they have successfully replaced the seals and bearings. Despite asking them to check the state of the motor a month ago, they're looking at it now ... 3 days before I am to launch. There is a slim chance we can have a replacement motor in before the launch, but if not, am I correct in understanding that you can remove and replace the motor while in the water? That would enable me to keep to the schedule and then replace later if needed.
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 21 August 2024 at 00:22
	Yes Jon, you can replace the motor while floating. Is you motor dead for sure?
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY

Lyn Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 04 February 2022 Location: Hampton, VA Status: Offline Points: 190	Post Options Post Reply Quote Lyn Report Post Thanks(0) Quote Reply Posted: 21 August 2024 at 14:02
	Thank you Leon. The motor was working fine before I hauled out. Their observation was largely on the bottom surface which doesn't matter and can be cleaned up. But since I'm not there, it is hard for me to interpret their assessment when it comes to launch or don't launch. Knowing that I can replace the motor later on the water is a huge relief. We will test it before we launch and in the water before they release the slings.
	Jon S/V Lyn 2017 Hanse 588 \| Hull 19 \| Deep draft \| 150hp \| 220v & 110v systems \| Lithium House Bank

Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 21 August 2024 at 16:22
	Just a reminder Jon. If you can file a notch in the flange it will allow any water ingress that passes the seals to leak out past the motor. That way you have a visual on what’s going on with the seals and can save the motor from seawater corrosion. A dremel tool works well.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY



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