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Old 09 August 2005, 08:39   #31
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Quote:
Originally Posted by stan_deezy
cat cracker
Yup
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Old 09 August 2005, 08:40   #32
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Originally Posted by Jono
Yup

Grangemouth?

wot do I win????
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Old 09 August 2005, 08:43   #33
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Quote:
Originally Posted by stan_deezy
Grangemouth?

wot do I win????
Nope... although I did build the same parts for Grangemouth! It's a refinery in Qatar... close but no cigar
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Old 09 August 2005, 08:45   #34
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As long as you didn't build the 1989 vintage (if memory serves correctly). They're still pulling bits of it out of the river............
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Old 09 August 2005, 08:49   #35
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Originally Posted by Nos4r2
And I thought it was part of a ships boiler or something like that lol...

Couldn't tell you then-not there. It does have a layer of corrosion though-that or oxidised nickel.it'd be bright if it was stainless and not corroded.

What DID cause it?!
What appears to be corrosion is in fact carburization.. that is the steel has been burnt. What has happened is a two stage failure. Firstly they had a temperature "run away" which is what burnt the steel, then they had a high sulpher content in the feed stock (stuff what goes through the equipment) which combined with elevated temperatures caused the catastrophic failure in the S/steel welds that's pictured here...nice
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Old 09 August 2005, 08:50   #36
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Quote:
Originally Posted by stan_deezy
As long as you didn't build the 1989 vintage (if memory serves correctly). They're still pulling bits of it out of the river............
Ssshhhhh....!


Naah! We didn't have nuffin' to do with either the '87 ot '00 explosions... honest Mister.. it woz a steam pipe wot went "pop" not the cracker...
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Old 09 August 2005, 09:15   #37
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yeah yeah, I believe you Mr Jono.......mind yer head on the cell door! oops sorry!

Back to the picture: looks pretty lethal that failure, but I didn't think it was part of an outboard yuk yuk yuk!
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Old 09 August 2005, 09:39   #38
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Quote:
Originally Posted by Nasher
Think I started something here.

Remember the crack isnít in the gearbox itself, itís in the Exhaust chamber between the box and the prop. The bearing itís closest to is the one held in a Ďspider that sits just behind the prop.

Iím struggling to find somebody to weld it at the moment, although I may have located a spare casting, but the guy involved canít check itís the right one until later in the week.

Nasher.
I would try lumiweld if all else fails!!! seems designed for the job..........
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Old 15 August 2005, 07:21   #39
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An update

I struggled to find somebody to weld the crack in the casing. One guy that tried started and another crack opened up alongside.

I decided to have a go with the JB Weld so I could use it over the weekend and take a chance, especially as there was going to be another boat with me. So, spent all Thursday evening grinding, cleaning, mixing, applying etc and was very pleased with the result. It went off rock hard, and the two bits of scrap alloy I glued together have taken a lot of serious abuse to separate again.

Then on Friday I had a call from the ever helpful MB Marine in Fareham to say they had a spare used bottom casting and gear set. So I spent all Saturday afternoon swapping my water pump and gearchange mechanism into the new casting and fitting it to the leg.

Had a great day out on the Solent yesterday.

Iíd like to know how the JB Weld would hold out, so may one day put the repaired leg on and try it close to shore with another boat about. The JB Weld will also now be a permanent addition to my toolbox.

Nasher.
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Old 17 August 2005, 20:23   #40
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Yeh, TIG is a specialist job!

If you need welding to the gearbox case, speak to either of these people:
Gordon at Autoweld in Southampton (He probably won't do it himself but will know a man who can) - I haven't got Gordon's number immediately to hand to shout if you need him, or Andy Clarke at The Bosun's Mate http://www.bosunsmate.co.uk
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