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Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Sounds like the simplest approach tbh.. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Looking a bit further... The 'key' seems to protrude 4mm from the shaft, however when I measure the depth for the key in the taper lock it is only 3mm. This would obviously cause the issue of the taper lock cracking (as it has done). So I need to find a key that is a different depth, but I am having significant difficulty finding a key for sale, and would have expected it to be sold alongside the taper lock? What am I missing ? Ignore me - found them.. Just didn't come up in the search nicely... -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
The shaft is exactly 38mm. The taper lock is 1610-1.1/2" Taper Lock Bush and has a measured 37.4 inside diameter. A light tap and it fits nicely onto the shaft. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
I have ordered a micrometer to make the measurements needed... -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Thanks for this advice. I am certainly missing something as my second taper lock has now cracked when I checked before moving today. Not failed yet, but obviously it will. The engine mount is now solid after a good tighten so this was not the cause this time. The shaft seems to be in good condition, and the taper lock is a good snug fit on the shaft. When engaged, visually the shaft looks like it is spinning centrically on both sides of the coupling. I tightened the grub screws a small amount each and equally.. the only thing that looks off is that the slot on the shaft for the key is worn and not a perfect fit for the key. The key is the same that has always been there so I am assuming that it is not over height, but this is a possibility for the new taper locks I guess. Each time I have checked it since installing the second one (twice), one of the grub screws had become slightly loose (an 1/8 turn maybe), so I made sure that was tightened. At a loss at the moment what has caused it this time... -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Initially I had an issue with the weed hatch, which created a swimming pool of oily water all around the mounts and lower part of the engine. The engine mounts I believe are only a few years old, but I don;t think my weed hatch incident has helped... Yes these mounts look to be the same. Still concerned that the mounting bolt turns.. My adventure sounds very similar (although significantly less stressful) !! So, as an update for those that have followed this thread.. Despite checking the engine mounts before travelling, and keeping a close eye on the coupling, yesterday the taper lock sheared and broke off again (yes the new one!). I believe the engine mount to be the culprit, as checking the nut, it had worked its way loose again (and yes I tightened as much as I possibly could by hand). Have ordered 2 new taper locks, tightened the engine mount as much as possible again and will repair the coupling tomorrow when the parts arrive. Should be a much quicker job this time. Will need to keep a much closer eye on the engine mount.. When it is tight, the engine looks nice and secure with it running and under load, so I am thinking that its not the mounting bolt that has sheared, and simply a case of the nut needing to be tighter.. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Did a check today after travelling a little. The lower nut on the engine mount had worked it's way back down again. I have tightened it up again (was at least two full turns). Any suggestions on how to get it to lock into place, it is this an indication that something else is wrong somewhere? -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Only because of the help you guys have given me. Wouldn't have had the confidence to attempt it otherwise.. Thanks again.. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Mount seems to now be looking good. The flexible coupling is reassembled and have moved a mile to test everything is good and we look okay. So, all sorted for now I think.. Will check all the nuts again in a week and keep a close eye on that engine mounts. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Tightening the bottom nut has raised the engine up to the other nuts and we are now back into alignment.. Tony, I am also concerned that mount is not all's okay, but if it tightens up like it has, maybe it will be okay?? Will now reassemble the coupling. Having difficulty undoing the nuts on the shaft that attaches to the gearbox atm... -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Here is a better picture.. The top nuts are a few mm above the mount, (you can see the gap on n this photo). The bottom nut has either worked it's way down, or it has collapsed somehow.. Will try and raise the bottom nut. (Had to be the mount which is hardest to get to 😞).. -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Really helpful, thank you for taking the time to write it. The prop side of the shaft seems to be fine. So I have started by checking my engine mounts. Three are nice and tight, but the forth ones nuts turns easily. But also the bolt also turns with it. With the shaft alignment, I am about 2-3 mm out on the x-plane. The mount that is loose is the one closest to the gearbox on the right hand side (looking from the shaft). I'm hoping that raising that mount will correct the alignment. I'm thinking that I need to tighten the nut/head under the mount to raise that leg up and make it right again, which should have the effect of adjusting the shaft back into alignment.?? Attaching a photo of the mount that is loose. Concerned now that if the bolt moves that maybe it has sheared? Should the bolt be able to move? Or should that be locked to the mount itself? -
Propeller shaft flexible coupling 'broken? ?
moiuk replied to moiuk's topic in Boat Building & Maintenance
Yes, there is another bearing there. Okay 👍 If you think that is the easiest approach then I'll do it that way..