Could the worn keyway be related to the need for the transmission rebuild? I have gone through two transmission rebuilds in the 30 years I've owned my boat. I've never encountered a loose keyway though.
If there is any chance of losing your shaft, I would fix it ASAP and I wouldn't rely on a zinc to keep your shaft in place unless you don't use the boat while you are counting on it. Just my $0.02... Bob Bob Boyer S/V Rainy Days / Annapolis MD 1983 C&C Landfall 38 - Hull #230 email: dainyr...@icloud.com blog: dainyrays.blogspot.com "There is nothing--absolutely nothing--half so much worth doing as simply messing about in boats." --Kenneth Grahame > On Jun 5, 2015, at 3:40 PM, Russ & Melody via CnC-List > <cnc-list@cnc-list.com> wrote: > > Hi Brad, > > Good to hear you have a zinc ahead of the strut but is it far enough ahead > that you can push the shaft back to remove the shaft coupling half? > > Rotational play between shaft & coupling is not as bad as excess clearance > between the hub & shaft. I would attempt a temporary repair and deal with it > at the next haulout. Best case scenario is all you need is a new key, they do > get worn quite a bit with lost motion (it takes quite a hit every gear > shift). > > Get them apart and measure along the keyway on both pieces to determine wear > pattern. > If you find either keyway shows wear you have two options, 1) make a stepped > key that matches each slot (keyway) size; 2) fit a tiny shim with the key in > the worn slot. > A stepped key is not difficult to make by hand, I've done a few for > industrial pump situations, but it can be tedious. > A shim for this is going to be like working on a miniature train set. > But you might get lucky and find something that just fits. > For either temp repair I suggest Loctite between coupling half & shaft (and > set screws as Danny mentioned) for re-assembly. Get the hub, with key laid > in, started onto the shaft by 25%, then smear Loctite on loading area and get > the coupling half into proper position and tighten immedately. > > Whoa, I didn't even finish that last sentence and heard the shouting. Chill > man, it's not 5200. This is from Loctite info: >> "Here it is from the horses mouth. The Loctite corp.. >> >> Q: How can I remove a fastener that is "permanently" locked in? >> >> A: The application of heat is needed to remove a fastener that can't be >> removed with a hand tool. Temperatures of 325F and above is needed to break >> down a standard anaerobic, 500F for high temperature Anaerobics. A heat gun >> or propane torch is commonly used to do this process, and careful >> disassembly should occur while parts are still hot. Once apart, and cooled, >> use methylene chloride (Chisel #79040) to remove cured excess material. >> Always wipe down the fasteners with clean up solvent to remove the wax film >> that Chisel leaves on the surface. > > For the permanent repair the only new thing you'll need is a key. A machine > shop will true the offending keyway and possibly match it to the other keyway > if it's off a bit too or just true the one and make a custom (stepped) key to > use. If it's the stepped key options then make sure you get a couple of > spares and the dimensions. > > Cheers, Russ > Sweet 35 mk-1 > Vancouver Island > > At 11:16 AM 05/06/2015, you wrote: >> Content-Type: multipart/alternative; >> boundary="----=_NextPart_000_005F_01D09F81.10182600" >> Content-Language: en-us >> >> I recently had my transmission out for a rebuild and upon putting it back in >> and the boat back together discovered that the propeller shaft coupling is a >> little loose on the shaft, maybe 1/8” of rotational movement on the shaft, >> like possibly the keyway is worn?. Have tried tightening the set screws, >> which secures the coupling but eventually they work loose and again there is >> movement of the coupling on the shaft. It’s been recommended that I have >> the boat hauled, the coupling removed, the shaft pulled out and provided >> the shaft is ok, a new coupling fitted and faced to the shaft, and then >> reinstalled for a final alignment. >> >> My question to the group is has anyone else been running around with a loose >> coupling and is this something I should be immediately concerned about? >> >> Thanks, >> >> Brad Crawford >> CnC 36 >> Seattle >> >> _______________________________________________ >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go to the bottom >> of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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