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27th September 2009, 21:49 | #231 |
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Crankshaft Failure
Finally picked up the old engine bits today. Had a look at the crankshaft and with a metallurgist with me arrived at the following conclusion.... Its broken!!
Seriously though it does look as if there had been a weakness developing for a long time, maybe even from manufacture with a pitted area comprising nearly half the diameter of the shaft. So it was a case of when would it go as opposed to if. The other half was good clean shear
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Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER... Last edited by Dragrad; 27th September 2009 at 22:10.. |
27th September 2009, 21:51 | #232 |
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Yes definitely scrap!
What bits (if any) did you reuse from engine Andrew? |
27th September 2009, 21:55 | #233 |
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Nearly all of them. Need to see what the garage left for me, I think that there are a couple of bits still at the garage. Will check on the 'morrow.
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27th September 2009, 22:23 | #234 |
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Crankshaft part 2
The area as shown in the pic is the pitted area showing the extent of the pitted fracture area. To the right is the shear, when it finally went.
On the left in the ringed area the metal was bashed around a bit when it broke. Same applies to the piston pic in the earlier post So with only half of the required metal being used it's no wonder the darn thing snapped!! Apologies on the pic quality - mobile phone!
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Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER... Last edited by Dragrad; 27th September 2009 at 22:26.. |
27th September 2009, 22:31 | #235 |
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Thanks Andrew, nice to know I was 100% correct in my non technical diagnosis.
http://www.the75andztclub.co.uk/foru...&postcount=177 |
27th September 2009, 22:33 | #236 |
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Looks like it could well have been faulty for some time? (I think GG came to that conclusion some time ago?)
Pictures to BMW would be interesting for a response. Last edited by JohnDotCom; 27th September 2009 at 22:44.. |
27th September 2009, 22:45 | #237 | |
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Quote:
My mate reckoned it could have easily have come out of the factory in a weakened state (ie bad casting) and as time went on a fracture started and kept on growing as time and usage went on. Until there was more fracture than metal, so when I dropped into Sports mode and floored it...... The rest is history Anyway one job for the weekend- put back the Pierburg MAF and Synergy 2
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27th September 2009, 22:46 | #238 |
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Thinking about that.. any contact details?
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29th September 2009, 09:58 | #239 |
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Don't forget chaps that Andrew's engine was "modified" and therefore any power upgrades do in fact "eat into" the 10-15% SAFETY MARGIN that engine designers build into components.
Who knows how much longer it would have lasted in a "Standard" state of tune. We will never know! It still strains my ear to rev a CDT/i diesel above 4000 RPM & will do so even more now
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[SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block Last edited by Jules; 29th September 2009 at 21:58.. |
29th September 2009, 21:46 | #240 | |
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Quote:
If they are the same, does your opening statement mean that the 135bhp engines might be more susceptible to crankshaft shearing?
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