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Rawmusic
46 Posts |
 Posted - 08 Nov 2011 : 15:59:55
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| Ok so coming through rugeley today, I stopped got some petrol, went back started the boat set off e outboard seemed to jump slightly in the air no I've got no forwards or backwards, tilted the engine out with the engine running and the prop isn't turning, is there some sort of weak link in there incase of hitting submersed objects? If so how hard is it to replace ? Oh yeh to make it more interesting I think my tools are back in sunny Runcorn. |
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Rawmusic
46 Posts |
Posted - 08 Nov 2011 : 16:09:23
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Ok googled it, read up on sheer pins, if I tilt the prop I can turn it by hand so I guess this is what has gone, is it just a case of undoing the nut on the end and working out a size? I'm off to do the 2 hour walk back to the car see what tools I have, and if I can sort it.
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IanM
United Kingdom
2238 Posts |
Posted - 08 Nov 2011 : 16:45:44
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Some no longer have sheer pins. Instead they have a kind of rubbery coupling that is designed to slip when the prop is obstructed.
Someone will probably be able to tell you which yours has if you tell us the make and model of outboard.
Before you worry too much about that stuff, check that the outboard is properly engaging gear. It might be stuck in neutral or just failing to engage gear fully. Take a look at where the control cables attach and make sure the lever on the engine is moving the full distance. |
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Rawmusic
46 Posts |
Posted - 08 Nov 2011 : 16:52:16
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| I have one of those outboards no one seems to know about, its a tomas 18 dates back to 60's 70's, throttle control seem to move full distance each way, I've pushed the jobby back in to engage it as well, as I say I was moving when it first happened. Everything at the engine end looks like its doing what it should, well expect the moving water bit |
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df
United Kingdom
5994 Posts |
Posted - 08 Nov 2011 : 17:12:57
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I would guess it has a pin, rubber bushes usually still feel fairly solid by hand when they slip, remove split pin, undo spinner nut, remove prop and the pin should fall out in 3 mangled bits, there may be some spares under the outboard cowling somewhere if you're lucky.
Check the edge of the prop for flat spots while it's off and run a file over them.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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Deano
United Kingdom
1843 Posts |
Posted - 08 Nov 2011 : 18:36:01
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Sheer pins can be manufactured if not available. In an ideal world, turned out of aluminium on a lathe with a neck for a deliberate weak spot.
In an emergency, any old nail cut down to size, I once fixed my old scouts ancient Yamaha with three small cable ties!! It was either that or row the length of Lake Windermere!!!
Dean - Boating on the Great Ouse.
Freeman 30 "Silver Gem"
See the photos http://www.flickr.com/photos/54758027@N00/ |
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adi-n-chez
United Kingdom
1980 Posts |
Posted - 08 Nov 2011 : 19:01:20
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The fact that the motor kicked is a pretty surefire way that you hit a underwater obstruction (Probably a trolley!)
I know the 5HP motor had a shear pin so guess yr 18 will have too !
If there are no spares aboard , then Deano is correct a nail will get you going ! (Although it wont shear when you hit the next trolley !)
Great Haywood boats may be able to help perhaps , if not Midland Chandlers @ Penkridge is another possible (Altough most are sewer tube based!)
Good Luck !!
Adi
Sewer Tubes ? I'd rather have a D**ncr*ft (Only Kidding) |
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Rawmusic
46 Posts |
Posted - 08 Nov 2011 : 20:16:56
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| Thanks folks, well by the time I walked back to the car to realise there were no tools there either it was to dark and to late to find any, so 8.30 trip to wilkinsons for a cheap adjustable spanner and then I guess great Haywood or fradley to try and find a pin, unless I just opt for the nail option as a temporary fix, I must start keeping some tools on the boat. |
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tigtog
United Kingdom
421 Posts |
Posted - 09 Nov 2011 : 00:27:17
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| my prop would not spin back in the summer, it was the remote cable the clip had snapped that holds it in place in the outboard, wacked a couple of cable ties on it all ok (so far) |
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Rawmusic
46 Posts |
Posted - 09 Nov 2011 : 19:27:06
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So to cut the story short, it was the pin, and you don't need any tools to get to it, this I realised after 3 trips to buy various uneaded items, replaced it with a m4 bolt and all was fine for 10 mins then the same again, so far today I've replaced the bolt 4 times I have now realised how to tilt the outboard so less of the leg is in the water but I still hear a thump at least 1 a minute if not every 20 seconds or so as the outboard seems to hit the bottom, do I need to consider some ballast in the front of the boat (Norman 20) or is it just one of those things.
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df
United Kingdom
5994 Posts |
Posted - 09 Nov 2011 : 19:35:58
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You are either in a realy sh1tty bit of canal, have an ultra long shaft engine, or a cut down transom by the sounds of it, how far under the hull does the prop sit?
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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adi-n-chez
United Kingdom
1980 Posts |
Posted - 09 Nov 2011 : 20:29:38
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quote:
Originally posted by df
You are either in a realy sh1tty bit of canal, have an ultra long shaft engine, or a cut down transom by the sounds of it, how far under the hull does the prop sit?
I guess water levels are maybe a little low , & Rugely can be a little rough with Cr*p, however our long shaft Honda sits lower than most (Certainly lower than any Norman I have encountered) & we dont suffer (Although no shear pin) We also didnt suffer with the Z Drive either.
I suspect as Dave says you either have a Ultra long shaft or a low Transom (OOOOOO remember the days of transom Ht discussions !)
Post a pic from the back if u have chance & also with the motor tilted.
Adi
Sewer Tubes ? I'd rather have a D**ncr*ft (Only Kidding) |
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Rawmusic
46 Posts |
Posted - 09 Nov 2011 : 21:17:11
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| Will take some pics in the morning, I'm home tomorrow night so can upload them etc. At a guess I think from bottom of leg to waterline was 3ftish, its not that excessive is it? |
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IanM
United Kingdom
2238 Posts |
Posted - 09 Nov 2011 : 21:49:05
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quote:
Originally posted by Rawmusic
Will take some pics in the morning, I'm home tomorrow night so can upload them etc. At a guess I think from bottom of leg to waterline was 3ftish, its not that excessive is it?
Yes! That's excessive! |
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df
United Kingdom
5994 Posts |
Posted - 09 Nov 2011 : 22:17:25
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Sounds a lot, the anti cavitation plate above the prop should sit just below the hull to give the prop clear water but no more, I would have thought you'd have a bit too much back pressure on the exhaust too.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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Rawmusic
46 Posts |
Posted - 09 Nov 2011 : 22:21:55
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| Ok so I am a tad new, DF I think o know the plate you mean, but how do I know about back pressure on exhaust? Photos will follow if you're lucky I'll try and find a tape measure. |
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Topic |
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Prop stopped turning, suggestions please
