need advice on exhaust spigots - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 17 (permalink) Old 08-17-2019, 07:00 PM Thread Starter
Minitwins
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need advice on exhaust spigots

Hello all,
I am about to have some work done on my 1954 Thunderbird engine. Both exhaust spigots on the head are damaged (pictures attached). What is the best solution? I think I am correct in believing that these spigots are not threaded or pressed in but rather a part of the iron head.. The company I am going to for the repairs said that if that is the case it would be better to cut them off and bore out the exhaust ports to press in new spigots as welding them could result in them being out of round. What are your opinions?

need advice on exhaust spigots-img_1996.jpg

need advice on exhaust spigots-img_1997.jpg
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post #2 of 17 (permalink) Old 08-18-2019, 06:02 AM
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There’s enough left there to hold the pipes.

The one with the long crack looks like it needs the piece removed so it doesn’t drop off in use.
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post #3 of 17 (permalink) Old 08-18-2019, 06:06 AM
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Is that a crack in the head at 8 o'clock??? If so then pressed in versions won't work either. The crack will only get bigger with pressure plus heating and cooling.

Personally, I would take the work to somebody that can weld cast and get the spigots/exhaust stubs repaired. Don't get them removed or replaced, just repair them. I reckon they could be welded up so that they are as good as new.

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post #4 of 17 (permalink) Old 08-18-2019, 06:22 AM
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I agree - it must be easier to repair the spigots rather than remove / replace them ( your pockets will retain more money too)
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post #5 of 17 (permalink) Old 08-18-2019, 06:44 AM
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What TT say or scrap the head...Weldling cast iron ,especially thinner stuff, is a bit of magic....Building it up with spray welding or rod is possible and then the time spend making it all round and nice might be a bit expensive..Maybe a replacement is best...

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post #6 of 17 (permalink) Old 08-18-2019, 07:25 AM
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I'd cut off the dodgy bit and leave it alone
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post #7 of 17 (permalink) Old 08-18-2019, 07:42 AM
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Quote:
Originally Posted by tridentt150v View Post
Is that a crack in the head at 8 o'clock??? If so then pressed in versions won't work either. The crack will only get bigger with pressure plus heating and cooling.
I can’t see a crack in the head itself.
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post #8 of 17 (permalink) Old 08-18-2019, 06:26 PM Thread Starter
Minitwins
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No cracks in the head itself.. I did discuss welding but was told that getting the spigots round again when grinding back would be extremely difficult. if there is enough material there to hold the exhausts, I might consider just cutting off the damage
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post #9 of 17 (permalink) Old 08-18-2019, 11:27 PM
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post #10 of 17 (permalink) Old 08-19-2019, 04:06 AM Thread Starter
Minitwins
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That is actually the edge of the flaked paint. However on second inspection I did realise that the crack in one of the spigots goes more or less right down to the head, so in light of this new revelation... what are my options??

Apologies for the qaulity of the photo, I know it isn't perfectly clear but you can see the crack running in towards the head

need advice on exhaust spigots-1.jpg
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