Crack or casting marks?

sandman768
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sandman768
Edited Date/Time 8/14/2017 3:42pm
Picked up some eBay engine cases for my 96 cr 250.. I need the left side case. Upon further inspection I see what appears to be 2 cracks where the transmission bearing installs, right behind the clutch actuating arm. These cases are no longer availible new or I would have bought new ones...any opinions....can the case be tested to see if they are actual cracks or casting marks? Can they be welded correctly? Send them back & keep looking? Thanks for input,both cracks or flaws around 11 & 1 o'clock.

[img]https://p.vitalmx.com/photos/forums/2017/07/27/206691/s1200_image.jpg[/
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rmoto003
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rmoto003 7/27/2017 1:44pm
7/27/2017 1:44pm
Looks like casting lines to me
CarlinoJoeVideo
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CarlinoJoeVideo 7/27/2017 1:56pm
7/27/2017 1:56pm
The only photo I see is too blurry to give you a good answer. Can you post another?
sandman768
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sandman768 7/27/2017 5:25pm
7/27/2017 5:25pm
Screwdriver pointing to areas....these left side cases are very hard to find, unless you buy a complete bike, thinking at 20 plus years old the cases are way past their service life, thus many are cracking/ breaking in the stress areas, making them hard to come by.....my restored 96 with all new bearings,gears ect. Locked up in 2nd gear, I figured something let go, upon further inspection the left case, not this case, is cracked from the ignition stator plate bolt all the way through the clutch actuator arm area, an area that looks pretty stout. I have not even tore my bike down yet to see if the case failed first or a gear broke causing binding...

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ktm-5
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ktm-5 7/27/2017 5:30pm
7/27/2017 5:30pm Edited Date/Time 7/27/2017 5:30pm
Hard to say exactly but it does look like cracks. I work in tool and die and know all about casting marks. I would talk to an experienced welder about it
sleeve1
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sleeve1 7/27/2017 5:45pm
7/27/2017 5:45pm
Just an idea...
You could bubble test with dish soap and compressed air. Mix up some soap and water, then apply to the area and then blow air at it while looking at the other side to see if the crack passes all the way through. If you see soap/water coming through you might want to talk to a qualified welder.
ktm-5
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ktm-5 7/27/2017 5:48pm
7/27/2017 5:48pm
Also usually casting flaws are raised and cracks are not
omalley
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omalley 7/27/2017 7:47pm
7/27/2017 7:47pm
Might see if a local machine shop (especially engine) could do a dye test.
sandman768
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sandman768 7/28/2017 4:49am
7/28/2017 4:49am
ktm-5 wrote:
Also usually casting flaws are raised and cracks are not
Yes, that is what I thought...
sandman768
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sandman768 7/28/2017 4:50am
7/28/2017 4:50am
sleeve1 wrote:
Just an idea... You could bubble test with dish soap and compressed air. Mix up some soap and water, then apply to the area and then...
Just an idea...
You could bubble test with dish soap and compressed air. Mix up some soap and water, then apply to the area and then blow air at it while looking at the other side to see if the crack passes all the way through. If you see soap/water coming through you might want to talk to a qualified welder.
Thanks, good idea, I will try this today.....
sandman768
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sandman768 7/28/2017 4:52am
7/28/2017 4:52am
omalley wrote:
Might see if a local machine shop (especially engine) could do a dye test.
If I decide to have it welded, I would likely have this done first....thanks
TrailDigger 7/29/2017 7:08am
7/29/2017 7:08am
Looks like casting marks, have seen ones like thoses many times and have been concerned, but they've never been an issue.
sandman768
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sandman768 8/14/2017 6:34am
8/14/2017 6:34am
omalley wrote:
Might see if a local machine shop (especially engine) could do a dye test.
This....had auto machine shop perform Zy-Glow dye test..... Not cracks....looks like I have a usable case...
ktm-5
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ktm-5 8/14/2017 3:42pm
8/14/2017 3:42pm
Good deal. Thanks for the update

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