[Public-List] Stern Tube Repair

Jonathan Bresler via Public-List public-list at lists.alberg30.org
Thu Aug 24 13:11:13 PDT 2017


Best wishes for successfully fixing the stern tube with minimal unexpected

Would like to update the information on the Alberg 30 association's boat
history spreadsheet, which you can download at
http://www.alberg30.org/boat/A30BoatHistory.xlsx .   Could you tell me

   - when you got you boat, #414,
   - who you got her from,
   - what you have named her,
   - and where you keep her.

The information that we have is shown below (please ignore the first column)

Thank you,

414   1970 1970 0 Western - Vancouver dealer Mar 18/70 (by rail)
414   2007 2013 6 Arcos Nolan Pat Seward Alaska
414 2017 2017 Scarnichia Hernan

On Wed, Aug 23, 2017 at 11:28 PM, Hernán Scarnichia via Public-List <
public-list at lists.alberg30.org> wrote:

> The stern tube has de-bonded from the hull, probably from the shaft banging
> against the stern tube. This has been ongoing since last fall when I asked
> on this list (and got some very helpful replies).
> On my boat (#414) there is none of the sealant that others found between
> shaft log tube and hull, so possibly a previous owner removed this....
> I have re-aligned the engine a couple times and it seemed to improve for a
> while but the problem seems to be getting worse now. I aligned it the best
> I could and when looking at the shaft with the engine running and in gear
> there is still some vibration on the after part of the shaft (hose and
> shaft loge move around). This movement is worse when moving at speed and
> barely noticeable when running the same RPM tied to the dock.
> Maybe the 2 blade prop is causing vibration because of the water rushing
> past the keel?
> Maybe the cutless bearing is worn?
> Soooo i'm getting ready to finally fix this.
> I have not hauled out yet so I don't have the exact measurements of some
> parts and was hoping someone that has done this before can help confirm the
> measurements so I can order parts and have everything ready for haul out or
> offer any other tips for this job.
> Plan A is to remove the engine and fuel tank under cockpit to get better
> access and remove the stern tube, clean everything up and glue the tube
> back on (assuming it is in good shape). I'm planning on using Pettit
> FlexPoxy to glue it. I will also replace cutless bearing, check shaft and
> coupler for straightness and change to a 3 blade prop. (campbell sailor
> 12x8 already ordered)
> searching through past list messages I find that the cutless bearing is
> 1-3/8.
> is it safe to assume that this is the same for all our boats?
> what size packing for the prop shaft stuffing box?
> Also on previous list messages I see that the shaft log tube and the
> stuffing box are not the same diameter? (1-3/8 tube and 1-1/2 stuffing box)
> what size of hose have you used?
> Does anyone remember what the clearance is between the shaft log tube and
> the shaft?
> The shaft is 7/8 and I measured the outside of the shaft log tube to be
> 1-5/16 so I'm guessing the inside might be 1 inch?
> This would leave 1/16 clearance which does not seem enough to prevent the
> shaft from touching the tube when engine vibrates/moves....
> this makes me think of Plan B: build a new fiberglass stern tube that is
> bigger and allows the shaft to move more.
> anybody else has a problem of the shaft touching the stern tube? were you
> able to correct this with just engine alignment?
> I have a universal m3-20b diesel, maybe this vibrates more than the old
> Atomic 4?
> Thanks for sharing your knowledge
> Hernan
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Jonathan M Bresler
S/V Constance Alberg 30 #262
Annapolis/Eastport MD

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