Do you think this one is repairable?
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| Cracks in heads https://ausmini.com/forums/viewtopic.php?f=2&t=95970 |
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| Author: | gtogreen1969 [ Thu Aug 31, 2017 12:23 pm ] |
| Post subject: | Cracks in heads |
Do you think this one is repairable?
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| Author: | simon k [ Thu Aug 31, 2017 12:26 pm ] |
| Post subject: | Re: Cracks in heads |
I've had one that cracked back to the sparkplug hole repaired by spray cast iron, and then helicoiled, just kept cracking... I reckon that'd do the same |
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| Author: | peterb [ Thu Aug 31, 2017 12:52 pm ] |
| Post subject: | Re: Cracks in heads |
Might be time to go to head heaven.n |
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| Author: | drmini in aust [ Thu Aug 31, 2017 2:22 pm ] |
| Post subject: | Re: Cracks in heads |
Nah I had one like that, gave GR a look, verdict good for scrap only. You will find it continues down the exhaust port into the water jacket. |
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| Author: | gtogreen1969 [ Thu Aug 31, 2017 3:13 pm ] |
| Post subject: | Re: Cracks in heads |
Not mine. I just wanted to see what your thoughts were on how bad the cracks were. http://www.ebay.com.au/itm/162653003035 |
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| Author: | gtogreen1969 [ Thu Aug 31, 2017 3:23 pm ] |
| Post subject: | Re: Cracks in heads |
What about this one? Are these types of cracks ok to repair? 
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| Author: | drmini in aust [ Thu Aug 31, 2017 7:59 pm ] |
| Post subject: | Re: Cracks in heads |
gtogreen1969 wrote: What about this one? Are these types of cracks ok to repair? Yes that can usually be repaired. By those who know what they are doing. 
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| Author: | Bubbacluby [ Fri Sep 01, 2017 11:31 pm ] |
| Post subject: | Re: Cracks in heads |
Doc I have a mk1 S head very similar to to the one above you say can be repaired. Talking to engine machinist and he thought could be fixed with some seats. This sound like an ok solution that would work? Sent from my SM-G935F using Tapatalk |
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| Author: | drmini in aust [ Sat Sep 02, 2017 6:36 am ] |
| Post subject: | Re: Cracks in heads |
Needs to be vee'd out, preheated and welded with nickel electrode. Then machined. The trouble with S heads is there is so little metal there, inserts are not a reliable solution. Have a talk with Graham Russell. I have a 940 head that had dropped a valve, smashed an old insert and damaged the inlet seat. Graham fitted a new insert and machined the seats after we welded up the seat recess. |
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| Author: | Convertible Mini [ Sat Sep 02, 2017 7:33 pm ] |
| Post subject: | Re: Cracks in heads |
If it is cracked .... Throw it away. |
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| Author: | gtogreen1969 [ Sat Sep 09, 2017 3:37 pm ] |
| Post subject: | Re: Cracks in heads |
What is the going rate for a crack test? |
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| Author: | Bubbacluby [ Sat Sep 09, 2017 11:20 pm ] |
| Post subject: | Re: Cracks in heads |
I had one done, just with the magnet. COst me $70 |
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| Author: | carter [ Sat Sep 09, 2017 11:25 pm ] |
| Post subject: | Re: Cracks in heads |
Doc I have a mk 1 s head that was cracked the previous owner has welded the crack and ground it back. Is this now haddit or would it be ok? |
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| Author: | drmini in aust [ Sun Sep 10, 2017 8:03 am ] |
| Post subject: | Re: Cracks in heads |
carter wrote: Doc I have a mk 1 s head that was cracked the previous owner has welded the crack and ground it back. Is this now haddit or would it be ok? You need to crack test it. Alternative I have used- bolt 2 heads together with a gasket, block the heater, bypass and thermostat holes, and hook up to garden hose. This is usually 70-100psi, if cracked it will leak. |
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| Author: | ausdino [ Tue Sep 12, 2017 5:24 pm ] |
| Post subject: | Re: Cracks in heads |
Could I please have your thoughts on this head: S, 12G940 - 12g1805 sold to me ( a long time ago ->30yrs ) as a big valve/port head - Longman mentioned. It has extra stamps on the heater take off side, .45 25. & <1052 ???? It has small cracks between valves on cylinders 1&4 ( 2&3 none ). The push rod holes on the intakes have been sleeved and ported into - very large ports - probably too big for a road car. It was/is to go on a 1380. It is slightly pitted from surface rust. Cheaper/better to cut a new head or get this one repaired and overhauled ? Valves look in v good condition, haven't sized the stems. A few pics.    
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