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corroded combustion chamber

corroded combustion chamber

Postby acadian » Sat Dec 24, 2016 7:32 am

I've come across a t140 splayed port head, the combustion chambers are badly (I mean really badly) pitted/corroded. Otherwise it's the most pristine looking T140 head I've come across in a long time.

Is there anybody who knows of a magician who might be able to repair this? Local machine shop says they could fill the chambers with weld, then machine back to spec... but the risk is warping/cracking the head.
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Re: corroded combustion chamber

Postby Triton Thrasher » Sat Dec 24, 2016 7:41 am

Pictures.

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Re: corroded combustion chamber

Postby grandpaul » Sat Dec 24, 2016 8:50 am

There are definitely pro welders that can build up the combustion chambers with weld beads, then set the head in a CNC mill and cut the original profile back out.

Image

That would cost more than a nice replacement head, FOR SURE, as I'm unaware of anyone that has a T140 combustion chamber CNC profile data file available... (although one may exist if you search)
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Re: corroded combustion chamber

Postby Fast Eddie » Sat Dec 24, 2016 12:25 pm

That amount of welding may soften the material of the head.
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Re: corroded combustion chamber

Postby auldblue » Sat Dec 24, 2016 12:59 pm

hi,

You could try Len Paterson ,but he is this side of the pond in Lincolnshire. If you google "the cylinder head shop, triumph" maybe he could give you some info.

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Re: corroded combustion chamber

Postby tri-man » Tue Dec 27, 2016 12:51 pm

So how bad is it?
It would have to be really bad to be unusable. My Trident's chambers looked like the surface of the moon, but I didn't know until I removed the carbon.
The head went back on and is performing beautifully. I reckon the pittings will fill up again soon enough anyway.
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Re: corroded combustion chamber

Postby acadian » Tue Dec 27, 2016 1:34 pm

Just got the head, I paid next to nothing for it, but looking at the chambers I think it's a paper weight... too bad though, because the rest of it is in great condition. I was told the p/o let the cylinder fill with water, and the bike sat like that for ages...

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Re: corroded combustion chamber

Postby tri-man » Wed Dec 28, 2016 12:20 am

Ouch. The damage I talked about is NOTHING in comparison.

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Re: corroded combustion chamber

Postby grandpaul » Wed Dec 28, 2016 7:54 am

Frame it and call it art.
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Re: corroded combustion chamber

Postby Triton Thrasher » Thu Dec 29, 2016 7:25 am

Sorry I asked for pictures!

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Re: corroded combustion chamber

Postby Fast Eddie » Thu Dec 29, 2016 11:39 am

Good grief!

I've never seen damage quite like that before, with the inside so bad and the outside so untouched.

I would suggest the head is scrap, the welding and re-machining costs would be way in excess of another replacement head. And as mentioned before, the amount of welding required is almost certain to soften the whole casting.
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