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December 27th, 2016, 09:07 AM   #1
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Crack in crankshaft 2006 fe 650

Hi

I'm rebuilding my engine, and have found what seems to be a crack in the crankshaft It seems like it has started from the woodruff keyway where it seems to be missing a little piece.
I'm wondering if anybody else on the forum has seen something like this? For all I know, it could have been like this for some time and maybe it can hold until the next rebuild. Seems to be trickier than I thought to get my hands on a used crank.
It is one for sale in Norway now, but that's the old one with the smaller rod pin..

Would love to hear your thoughts about this
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December 27th, 2016, 01:51 PM   #2
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I've seen metal missing before but never the crack. I can get it repaired for 200gbp. I wouldn't worry about it. it only happened because a previous owner had left the crank nut a little loose. with a tight nut and a repair it won't happen again.

Taffy
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December 28th, 2016, 03:19 AM   #3
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Nice Taffy, that's exactly what's happened with one of the previous owners. The nut has come loose and the gear has fallen off.

How much do you want for the repair + change the rod and rod bearing? It's ok if you want to take it as PM instead

Thanks for the answer
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December 28th, 2016, 05:40 AM   #4
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well a pin and bearing are 76gbp to a Norwegian! the crank pressed together is 45gbp.

the repair is about 125gbp. postage each way is 30 in the UK and 20gbp back to Norway. my man does a very good job and he can either just do the repair or leave it to me to fit the above.

Taffy
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December 28th, 2016, 05:53 AM   #5
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Ok, I thought you use to change the rod as well when you split the crank?

I'm wondering how you are thinking to repair it? I thought about cut out a little where the crack is and weld it, then machine it down again, but I don't know how far in the crack is, and I think it will be difficult to see it when you start to grind (if you don't have x-ray inspection equipment).


Regards
Steinar
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December 28th, 2016, 06:35 AM   #6
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I'm guessing but I think the damaged metal would br machined out and then built up again.

we go by what we see when we talk about rods being changed. however, niormally, if a rod is inspected before failure it is good enough to try again!

the problem is the 'true-ness' of the crank. if it has been a few 0.01mm out it wears away the outside 1/3rds of the rod leaving only the middle 1/3rd.

we often change the little end as well. I should have mentioned that.

Taffy
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December 28th, 2016, 09:26 AM   #7
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Ok. I will get back to you when I have spoken to the local engine workshop. Thanks for the quick answers

Regards
Steinar
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December 31st, 2016, 02:52 AM   #8
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Hi again Taffy

Spoke to the local workshop yesterday, and they recommended me to leave the crank be, because if they started welding on it, they would take the hardening out of it etc. And they meant it's probable it will hold as is, since the crack probably came because a previous owner had driven it with a loose nut, and with the nut tight and some loctite on the gear, it would be so tight that the crack won't have the space to grow any further.
They also could change the big end pin and bearing and inspect the rod for me, so I don't have to ship it to the UK.

But I do need some parts from you, so you'll hear from me again

Regards
Steinar
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December 31st, 2016, 03:12 AM   #9
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thats fine, nobody is 100% sure here. but thanks for letting me know.

Taffy
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December 31st, 2016, 03:31 AM   #10
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That's true. Will be on the lookout for a used crank so I have one in spare just in case.

Regards
Steinar
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