Cast Iron Fin Repair - Looking for recommendations

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NeilM
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Cast Iron Fin Repair - Looking for recommendations

Post by NeilM » Fri Dec 13, 2019 7:25 pm

Inspired by my MT500 and a kindling of interest in offroad-ish motorcycling, I have finally pulled the pile of boxes that are a 1974 Triumph T140v out of storage and into my workshop... which is now very crowded. The idea being to build it up as a desert racer / modern scrambler style custom.

The guy I got the T140 pile of bits from was a professional mechanic, in that he made his full time living working on cars and bikes, but, I don't think he knew Jack Schmitt about Brit bikes, as a result the top fin on one side of the barrel is snapped, I have the broken piece and it fits perfectly and I know using special filler rods it can be welded back on, but searching on line is not bringing any names within a several hundred mile circle of me, so I was wondering if anyone knows of a welder or engineering workshop in the South West of England that could do the job.
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ZIP TIE
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by ZIP TIE » Fri Dec 13, 2019 8:58 pm

Have you tried SEP (service exchange parts) if they are still going?
Not the cheapest but good work
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ZIP TIE
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by ZIP TIE » Fri Dec 13, 2019 9:01 pm

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arceye
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by arceye » Fri Dec 13, 2019 9:13 pm

Even with the special rods the chance of success is only about 50%.
I think a T140 is the best looking brit bike ever. 8-)
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NeilM
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by NeilM » Fri Dec 13, 2019 9:29 pm

Thanks for the link Zip Tie, as they pick up and drop off I'll e-mail them.

There is also a place I have found in the West Midlands that specialise in Villiers engines who say that can repair fins.

You are not the first person to say that Arceye, a friend of mine who is a welder said the same thing, but I thought it was worth a go. The alternative, which I have done before on customers engines is to grind the fin back and just make it look neat, as once the head is in place the top fin is actually hard to see. But, the perfectionist in me wants to give it a go... :roll:

The late T120's and early T140's were really well proportioned bikes, and the IOF frames although a little heavy, handle OK, at least with me riding they always seem to, but I ain't no scratcher!

I like the look of the new Triumph 1200XC, and as I have built similar bikes in the past, plus I have a Harris fork leg that will allow me to set the bike up with twin front discs, I thought I might be able to do something interesting with the T140, after it has been in bits since the 1990's, poor thing.
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arceye
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by arceye » Sat Dec 14, 2019 6:12 pm

I have welded a few cast iron fins for my mate who builds classic bikes and I must have been lucky they didn't crack.
Done lots of ally ones which are easy compared to cast iron. Its also pot lock if the casting is pure or contains impurities.
Got a cylinder liner done by SEP and they did a good job but you have to keep reminding them you want it back. :lol:
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phil
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by phil » Thu Dec 19, 2019 7:31 pm

Ive repaired a few cast iron fins on old brit bikes by brazing, its a pretty simple process, but seems to be a dying art.
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NeilM
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by NeilM » Thu Dec 19, 2019 7:38 pm

Seems like that might be an easier fix. I have a lot of hand made steel cycle frames that are fillet brazed and they hold together just fine.

I have been asking about locally for a skilled welder, I was going to pop out to the little trading estate where I had my MT500 MOT'd, there must be someone about, I mean, we used to make rocket engines and helicopters in the area, surely finding someone to fix my cylinder can't be that hard.... can it? :roll:
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phil
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Re: Cast Iron Fin Repair - Looking for recommendations

Post by phil » Fri Dec 20, 2019 11:20 am

Try asking at your local BOC branch.
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