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| rocker shaft hardness https://www.ausmini.com/forums/viewtopic.php?f=2&t=89734 |
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| Author: | simon k [ Tue Jun 16, 2015 10:34 pm ] |
| Post subject: | rocker shaft hardness |
how hard are rocker shafts meant to be? this one has done maybe 1500-2000km, and the end snapped off as you can see...  I took the rest of the shaft out tonight, and it's very soft - one pass over with a semi-circle file will make a mark the size of a tic-tac. This topic on turbominis has the same, but from 2008 - http://www.turbominis.co.uk/forums//ind ... tid=238138 |
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| Author: | drmini in aust [ Tue Jun 16, 2015 10:59 pm ] |
| Post subject: | Re: rocker shaft hardness |
I find the HD shafts from Karcraft are pretty hard. Stock replacement shafts are soft, not hardened at all. Material unknown. But BMC ones were good steel, probably EN8 or better. |
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| Author: | 69k1100 [ Tue Jun 16, 2015 11:05 pm ] |
| Post subject: | Re: rocker shaft hardness |
Any reason why they're drilled out to such a thin wall? That looks more like a hardened shaft break, however this can happen in ductile steel (soft) if a load is applied very rapidly. Hardening a shaft is unlikely to alleviate this problem. Could be rubbish steel too. |
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| Author: | carbon [ Wed Jun 17, 2015 4:44 am ] |
| Post subject: | Re: rocker shaft hardness |
There's also a very recent thread about rocker shafts snapping on the Mk1 forum : http://mk1-forum.net |
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| Author: | drmini in aust [ Wed Jun 17, 2015 8:15 am ] |
| Post subject: | Re: rocker shaft hardness |
A recent HD shaft I got was very poorly drilled and countersunk compared to previous. IMO quality of these is becoming a problem. |
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