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Old 15-01-2021, 20:57   #1
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Aquadrive Thrust Bearing: Warm and Whistling

10 year old Aquadrive unit unit (B20 or 30?) engine hours 1600, 150hp VW marine engine. Noticed a whistling noise having developed that appears to be coming from the thrust bearing under higher revs (engine rpm 2000) and possibly a very subtle bearing rumble. Tested temperature with a digital thermometer and (this is after 16hours straight of motoring) the thrust bearing sitting at around 75deg deg c with the shaft at 35deg c.

Some questions:
Does this sound like the early stages of a bearing failure
Anyone else had bearing failure of these units?
Anyone managed to replace the bearing or is it a new assy from Aquadrive
Possible to do in the water - think I can slide the shaft back if the taper connection can be released although have a face seal (PSS) that might make this a tricky operation.
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Old 18-01-2021, 22:46   #2
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Re: Aquadrive Thrust Bearing: Warm and Whistling

So we have removed the the thrust, yet to open it up to look at the bearings. Unit is quite smooth but quite a lot of resistance. Feels like it is running quite a lot of preload. Anyone know where to get information on the bearings used and the preload to set them up?
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Old 20-01-2021, 14:43   #3
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Re: Aquadrive Thrust Bearing: Warm and Whistling

Current distributor:
Aqua drive USA, a division of Mack Boring

Info@aquadriveusa.com
908-964-5656
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Old 21-01-2021, 02:55   #4
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Re: Aquadrive Thrust Bearing: Warm and Whistling

Thanks for the response. Talked directly to the manufacturer in Sweden. Will post an update once more is known.
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Old 12-02-2021, 18:42   #5
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Re: Aquadrive Thrust Bearing: Warm and Whistling

Just ordered my thrust bearing kit from Hanson Marine Engineering in Maryland. John Mills is who you want to talk to. Expensive item.
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Old 12-02-2021, 21:03   #6
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Re: Aquadrive Thrust Bearing: Warm and Whistling

Hansen Marine is in Marblehead, Massachusetts. Jon is awesome. As are Bob, Fred, and the rest.
Less than a mile from me.
Their support is fantastic too. Call and ask for help. You will get it.
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Old 12-02-2021, 21:11   #7
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Re: Aquadrive Thrust Bearing: Warm and Whistling

Oh yeah. And I had an Aquadrive fail. Bellows burst. Grease all over.
Replaced it (with one I bought from Hansen) and eventually realized the shaft strut was misaligned. The thrust bearing mount was offset. The engine was misaligned. The shaft was bent.
After digging out and rebedding the strut, having the shaft/prop/coupler trued, remounting the thrust bearing and aligning the engine it all ran smooth as silk.
I don’t know, but would not be surprised, if the alignment issues were the cause of the failure at about 2700 hours.
Btw, it was clear that the misalignment was not a factory issue, but later work.
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