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| Cracked crank or not? https://www.ausmini.com/forums/viewtopic.php?f=2&t=85000 |
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| Author: | carter [ Sun Mar 23, 2014 4:22 pm ] |
| Post subject: | Cracked crank or not? |
G'day fellas, picked up a heap of parts yesterday and just wandering I have 4 cranks 2 cooper s and 2 large journal 1100 s cranks. I had a fella tell me that if you tap a crank and it doesn't ring it's cracked.... Is this the case all the time? Because one crank doesn't ring like the others. Also got 10 1275 primary gears 40mm weber n lynx manifold, twin cooper s su's and a few other bits and bobs so some of these wil be in the for sale section over the next week or so keep your eyes peeled. |
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| Author: | MG Rocket [ Sun Mar 23, 2014 4:51 pm ] |
| Post subject: | Re: Cracked crank or not? |
Curious, which crank sounds dull? |
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| Author: | carter [ Sun Mar 23, 2014 4:53 pm ] |
| Post subject: | Re: Cracked crank or not? |
I'll have to have another look but I think it's one of the 1100s cranks |
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| Author: | drmini in aust [ Sun Mar 23, 2014 4:57 pm ] |
| Post subject: | Re: Cracked crank or not? |
Sounding dull is a pretty good indicator of a crack but it's not infallible. Conversely I've had ringers that were found cracked when magnafluxed or dyechecked. [edit] Stand it on one end and then ding a web with a spanner. Repeat with it standing on the other end. This can help isolate where the crack is, if one way rings and the other is flat. |
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| Author: | John Smidt [ Sun Mar 23, 2014 7:09 pm ] |
| Post subject: | Re: Cracked crank or not? |
as said before, it may still be cracked even if it does ring In my opinion if it holds the ring for a fair period of time it is usually a very good bet it is not cracked, I has always been My experience that if it does not ring it is cracked, That is not to say it cannot happen. but I would not buy a crank that did not ring |
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| Author: | drmini in aust [ Sun Mar 23, 2014 7:15 pm ] |
| Post subject: | Re: Cracked crank or not? |
I won't buy a crank unless I dyecheck it first... There are several other detection methods but dyecheck is cheap and cheerful, it works fine on surface cracks. |
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| Author: | carter [ Sun Mar 23, 2014 8:19 pm ] |
| Post subject: | Re: Cracked crank or not? |
So what's a ballpark figure of a dyecheck? |
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| Author: | drmini in aust [ Sun Mar 23, 2014 8:34 pm ] |
| Post subject: | Re: Cracked crank or not? |
carter wrote: So what's a ballpark figure of a dyecheck? Here's the kit description. http://www.rocol.com/products/non-destr ... esting-kit Sold by Blackwoods or other Rocol distributors. http://www.rocol.com/distributors/index ... talworking No idea what it costs, as mine came `gratis' 
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