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Cracked 940 head
https://www.ausmini.com/forums/viewtopic.php?f=2&t=74653		 Page 1 of 1
Author:  drmini in aust [ Sat Dec 17, 2011 12:58 pm ]
Post subject:  Cracked 940 head
During a recent 1360 engine rebuild I acquired a 12G940 head with unleaded inserts and recut inlet seats.
However, it has a crack in #3 chamber, from the middle water plug hole (plug removed) to the exhaust seat.
I milled then removed the exhaust insert, and used a dyechek kit to to see how far the crack went.
Unhappily, it goes right past the exhaust seat insert recess and into the exhaust port below. I don't see how I can weld it that far, so it looks like it's a candidate for the scrap bin. :x
The reason we didn't find this crack before fitting inserts is, the dodgy PPO painted the head face and chambers silver before putting it up for sale.
Moral of this story- never buy a head with the face and chambers painted!

Image

Apparently cracking here is not uncommon- GR had someone's head there the other day for reconditioning with this problem, but in both #2 and #3 exhaust ports.
NBG so he binned it.
Author:  dodge [ Sat Dec 17, 2011 2:48 pm ]
Post subject: 
are u able to tig it? i got a itty bitty torch, if u can get the dangle to it,
Author:  drmini in aust [ Sat Dec 17, 2011 3:14 pm ]
Post subject: 
If it only went down the chamber wall to the seat, I would vee it out, preheat and gas weld it with nickel bronze.
But there is no room to get down inside that port. :cry:
RIP...
Author:  68Rusty [ Sat Dec 17, 2011 3:28 pm ]
Post subject: 
Bummer, sorry to hear that :cry:
Author:  Convertible Mini [ Sat Dec 17, 2011 8:17 pm ]
Post subject:  Cracked heads.
I put 3 12G940 Heads in the scrap bin this week. I had been hanging on to them for about 20 years. One of them the ports were that BIG that the Middle exhaust port went into the water jacket. Shame as it was a 12G938 Too.
Author:  Bubbacluby [ Sat Dec 17, 2011 8:38 pm ]
Post subject: 
was it an ebay purchase?

Or from a so called "mini specialist"

I know you cant name and shame publicly, but PM sounds good
Author:  drmini in aust [ Sat Dec 17, 2011 8:56 pm ]
Post subject: 
Bubbacluby wrote:
was it an ebay purchase?

Or from a so called "mini specialist"

I know you can't name and shame publicly, but PM sounds good

The PO bought it from a bloke `north of Newcastle', I know who it is ( I had the box it came in) but won't say on here. Not a Mini place though.

Not sure if he is or was an ausmini member, I believe he's out of Minis now.
Author:  TheMiniMan [ Sat Dec 17, 2011 10:45 pm ]
Post subject: 
yeah it`s all more & more common that one Kev,,, we`re all getting cracked heads, cracked heads, cracked....crac,,,,

ah it`s an old joke :-)
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