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Old 05 April 2009, 19:31   #21
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Originally Posted by jyasaki View Post
You'd need to remove the leg and disassemble completely to weld it up. And be damn careful that things don't warp.

Had a friend who broke the skeg off a new Suzuki motor; he had a muffler guy weld it back on a grind it smooth. Next trip out the gearbox disintegrated due to water ingress through melted seals. Luckily for him, Suzuki decided to cover it under warranty, despite the "remove shoe, shoot foot" procedure that got him there.

Personally, if I was going to effect a repair, I'd use a steel putty type epoxy, and fair it out a bit along the remaining plate. It's not going to hold against a lot of load or anything; it's just there to isolate the prop from the surface.


jky
You could just dunk the whole lot in a bucket of water whist welding it, but I suspect that with the amount of metal around the area that the heat would dissipate before warping of the gear case would take place.
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Old 05 April 2009, 19:50   #22
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I've seen this before. It was caused by a line which was tied onto one of the transom eyes which fell over the back at speed. It got wrapped around the prop which pulled it tight, the force of which was enough to remove a similarly sized chunk out of the cav plate. No other damage was done to the engine (although the rope probably came off pretty bad!).

PS. I see in the first pic there is some paint missing on the prop. On the prop from the above situation you could see marks around the base where the rope and rubbed some of the paint off.
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Old 06 April 2009, 08:29   #23
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If it's any help, When I was looking at the various ways I could get PT onto mine, I discovered that the leg off the 75 is shared with quite a bit (incl Yam & Mariner) from about 50 - 90 HP.

Any breakers near you? Might be cheaper & easier to get a replacement gear case - your seller may be more willing to give you back a few hundred quid for a spare part & the hassle than the whole lot. I didn't cross check gearbox carryover, but from memory there are essentially two types - the old ones that take a smaller dia prop & the newer "K-series" size.

There's someone I saw recently on Ebay breaking a Merc 75 - NS marine?


I do wonder - the port list problem down to your hydrofoils not being particularly horizontal?
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Old 06 April 2009, 08:52   #24
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I do wonder - the port list problem down to your hydrofoils not being particularly horizontal?
It all suddently seems obvious when I read this ! Likewise the fitting if a 'used' caseing for a few hundred quid to fix the problem.

I wish I could think of these things !
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Old 06 April 2009, 13:30   #25
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Neil. .. if you can get the lower leg off .. drop it into West of Scotland Engineering, at Yorkhill in Glasgow , they will repair it to a standard you wouldnt have known there to be any damage. I used to catch/snap bits off my skeg on my 135, 150's and they straightened and welded them to perfection, and if there is any doubt (David Somerville , the owner) will tell you he cant do it but this would be unlikely IMO. Perhaps you could recoup some cost from the vendor, but if not, its one of those 'down to experience' ones, but I'm sorry you've had that experience from some scumbag .. He'll fill in the holes on the other side too, but before doing anything, test the boat to see if your problem is cured, to be sure you dont need to put the fins back on
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Old 06 April 2009, 15:56   #26
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That's good to know, thanks. I live in Oldham so its a bit of a haul to Glasgow, but may well be worth the trip for a good job. I'm hoping to get out on Sunday and see how it goes with hole, then take it from there.

Thanks for all the help guys, you have somewhat lessened the shock I felt when I pulled the foils off and felt my chin hit the floor.

While I was up in Oban picking the engine up, I blew the catalitic converter on the car, which to cut a long story short meant I had to leave earlier than I expected. But for that the foils would have come off up there and this would have been sorted there and then.

Still life's never dull eh :-)
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Old 06 April 2009, 16:22   #27
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Ah! sorry I saw Oban in one of your posts and looked no further ..sorry .. doh !
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Old 06 April 2009, 16:46   #28
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We seem to have moved on from the cause of this a little, but I have seen this before. It was due to some dopy sod trying to changed the impeller,without the knowledge of where all the bolts are.... I, I mean he, had never done it before and didn't know about the bolt hidden under the anti torque anode at the back of the leg. so I, I mean he, preceeded to hit it with wood,resulting a perfect replica of your damage what a donkey I , I mean he felt.

However it's not the end of the world, It was repaired using chemical metal sanded (cost next to nothing) and painted you would never have know it had happened. lasted 7 years like that. On your new boat, check the shafts not bent If it was an ally prop unlikely, new prop and your laughing..
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Old 06 April 2009, 20:34   #29
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Does Wavelength know you, sorry, I mean your friend?

http://rib.net/forum/showpost.php?p=289380&postcount=8
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Old 07 April 2009, 07:57   #30
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We seem to have moved on from the cause of this a little, but I have seen this before. It was due to some dopy sod trying to changed the impeller,without the knowledge of where all the bolts are.... I, I mean he, had never done it before and didn't know about the bolt hidden under the anti torque anode at the back of the leg. so I, I mean he, preceeded to hit it with wood,resulting a perfect replica of your damage what a donkey I , I mean he felt.

However it's not the end of the world, It was repaired using chemical metal sanded (cost next to nothing) and painted you would never have know it had happened. lasted 7 years like that. On your new boat, check the shafts not bent If it was an ally prop unlikely, new prop and your laughing..
Chemical metal? Is that the same as this:

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http://cgi.ebay.co.uk/QUICKSTEEL-Qui...3A2|240%3A1318

That Rogue Wave has made me aware of?
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