I have a 12G940 head with a just visible crack in an exhaust seat, does anyone know if it can be fixed and if so is it worth doing? Thanks

Ooh me tooo would love to know the answer !

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K

do not throw it away - or if you do, I'll pay the postage to send it down to me...

exhaust seat cracks should be fixable, just needs seat inserts which I always get done anyway. If the crack is terrible and goes back into the chamber, then maybe it's no good, but chances are it's fine

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did I tell you that I won a trophy?

Thanks for that, I put it back on the self for future reference

with more advanced welding techniques, like laser welding, getting more commonplace even bad cracks will become repairable without breaking the bank

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Rover 214 atm ....

Thanks, I have thrown out heads in the past but was hoping the technology had changed

Could you post a pic ? Would be a good info grab to collect cracks, locations , and fixes into one place .
I will take a photo of my 940 head and post it .
Sorry simonk ... This was the head ! And on closer inspection I discovered a dirty split between seats on chamber 3

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K

Cracks between seats are often fixable. But cracks that go down into the exhaust port for a distance usually cannot.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K

Geez, that head is crusty! If it's a 940 IMO it's not worth the trouble. Find another, or...
Ring Graham Russell, he has some brand new ones.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

crack is a bit hard to see

A member here had one cracked like that. Except, when I used the dyecheck kit, I found it went all the way from that water jacket hole on the face, down the chamber to that spot, then continued across the valve seat and down into the exhaust port.
No way to save it, couldn't weld inside the port, so we binned it.
Note-
The person who sold to him had disguised it by painting the head face and chambers with silver paint. We didn't find it until I started to deck the head.
Moral of story, NEVER buy a head with painted combustion chambers...!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks, you can see the crack does go down into the port. I am just doing a bit of a rationalisation of parts, I will put that head on the not so good pile

on closer inspection you can see the crack starting at the hole in the water jacket, just as Doc described. The head has now been "repurposed" just proving the A series will never die, it is now a 12940 garden

Well done.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.