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Post by Sunny on Jan 10, 2010 18:00:55 GMT
Got a slight problem with my engine screaming - prop not biting - when the boat slams into oncoming waves.
Its a Mariner 100 4-stroke
I've checked the locking nut on the prop and the holding plate tabs are all in place... but it was serviced recently and it might be that they haven't tightened the holding nut enough...so the prop is loose enough to slip under high tension.
Or is there a clutch or similar on the drive which is slipping under tension ?
When I bring the revs off and then build the power up again its fine until I hit the next tooth rattler. And works perfectly fine on a moderate sea.
Any advice before I go running to the service centre....
Cheers
Nick
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Post by Lavy on Jan 10, 2010 18:29:04 GMT
Could be the rubber hub starting to slip. Bit of a job to tell as you probably would not be able to make it slip by hand
Rich.
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Post by I DUNNO on Jan 10, 2010 20:08:27 GMT
all the prop nut does is stop the prop sliding off the spline, all the thrust is on the spline that the prop slides onto. it could be that the rubber between the spline and the prob is slipping when it is heavily loaded, if so a new prop is required.
hope this helps
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Post by snowy on Jan 10, 2010 20:09:10 GMT
Any chance of the stern lifting when you hit the wave and the prop cavitating?
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Post by baggsy on Jan 10, 2010 20:09:30 GMT
Might be getting some cavitation there on the big waves- trapped air or If it is slipping i might have a prop your welcome to use to find out just need the size of prop.
John
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Post by Canuck on Jan 10, 2010 21:37:50 GMT
Nick,
As I remember your engine should still have plenty of warranty left, I'd have a word with Steve Dawkins down at Burseldon outboards he's a Mariner dealer and a good bloke.- ( Scotty's boss)
Rich
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Post by Sunny on Jan 10, 2010 23:01:30 GMT
Cheers guys - thanks for the replies and suggestions so far. Speaking to Mike she hadn't cavitated before and in big seas, so it points towards the prop slipping.... she was serviced recently and the prop taken off and inspected etc... If its a new prop I need then its time to start crying...but that's boats for you. Rich, the prop was put on for Mike...so I don't think the engine warranty will cover it...but I'll ask. Baggsy, not sure on the size...I'll find out... but the offer is much appreciated; I may have to take you up on it...cash  Cheers fellas Nick |
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Post by lighty on Jan 11, 2010 0:16:48 GMT
Nick,
think you can get them re-bushed, not so costly as a new prop.
lighty
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Post by Henry on Jan 11, 2010 8:04:58 GMT
Nick,
Had the same problem twice on a brand new honda. Rubber bush in the prop slipping. New prop needed both times, covered on warranty though :ahhh:
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Post by sailorboyrob on Jan 11, 2010 9:25:54 GMT
Ive seen this sort of thing a few times mate, not with outboard props but with various other rotating equipment on the ships, its the same story every time. Rubber bush is a bit tight to get into position so out it comes and on goes a smear of oil or grease to get it into place that bit easier. Then disaster, slipping everytime there is a big load change. Try taking the bush out and giving a good clean before refitting it. Make sure all surfaces are grease and oil free. If its too tight try popping the bush into the freezer for a few hours and warming the prop up a bit. Should all slide together nice and easy! If it continues to slip then you need to think about replacing things.
I cant see any reason why you would need a whole new prop though mate, just get someone with a lathe to fit a sleeve into it if the inner bit of the prop if it is worn.
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Post by Canuck on Jan 11, 2010 10:23:36 GMT
If you fit a sleeve in the prop make sure its a marine grade ally such as 5083 ( I think) or similar or you will have mega corrosion quite quickly, using something like brass will effect the prop which will get eaten away as the brass is higher up the scale than ally. Hope this makes some sense.
Rich
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Post by Lavy on Jan 11, 2010 10:45:03 GMT
Think steel developments can re do the rubber hub if its not covered on warranty .
Rich.
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Post by sailorboyrob on Jan 11, 2010 10:56:07 GMT
If you fit a sleeve in the prop make sure its a marine grade ally such as 5083 ( I think) or similar or you will have mega corrosion quite quickly, using something like brass will effect the prop which will get eaten away as the brass is higher up the scale than ally. Hope this makes some sense. Rich Good point, I hadnt thought of the galvanic side of things. As I said I`ve never sleeved a prop, I suppose you could make a teflon sleeve without too much hasle. But at the end of the day I cant see the prop being damaged, only the softer rubber bush, which I would imagine to be fairly cheap to replace. |
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Post by scotty on Jan 11, 2010 17:27:14 GMT
Nick, i'm pretty damn sure you wont have a rubber bush inside the prop on your outboard mate  It should be a plastic hub.. i think its called a flo-tourque hub, cant remember exactly...... anyway, if that is slipping you can just buy a new hub assembly ;D Though before you do that, i would just makesure your not cavitating, it might not of cavitated when mike had it... but your a nutter  tightlines, scotty. |
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Post by scotty on Jan 11, 2010 17:45:43 GMT
And if you do fit a new hub, makesure that it is well greased before you put it back together! The removal and greasing of the hub is part of a full service, the idea of the hub is that if you hit the seabed the hub will break and potentionaly save severe damage to your prop and engine. The hub must be greased so in the event that you do hit the bottom and break the hub you will be able to remove it and replace it while out at sea. If you dont grease your hub, you wont get it out of your prop while out at sea! I've seen a couple of really bad cases where the hub literally wont come out and the prop has to be replaced  cheers, scotty. |
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