Cracked crank, Yet more problems |
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Cracked crank, Yet more problems |
jeffdon |
Jun 29 2014, 02:23 PM
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#1
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
Put my engine back together in November, and have been driving since then. Couple of 200 miles drives, mostly around town. Itts a 2056, webers, cam, nothing super high power. This weekend it started an awful clunk deep inside, and I got it off the road and towed home.
Got her puller apart, and here is what I have found. Crank broke threw the rearmost counterweight. How does this happen? So I need a new crank. What else should I replace? Obviously all main bearings. Rod bearings too? Attached thumbnail(s) Attached image(s) |
Matt Romanowski |
Jun 30 2014, 09:46 AM
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#2
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank).
Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... |
jeffdon |
Jun 30 2014, 11:22 AM
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#3
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank). Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... Looks like it hit the case. Marks that look like rough machine marks, but not even like machining. Deeper at the top. Is my case toast? Attached image(s) |
Valy |
Jun 30 2014, 04:39 PM
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#4
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank). Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... Looks like it hit the case. Marks that look like rough machine marks, but not even like machining. Deeper at the top. Is my case toast? Those marks will not trash the case. They don't look so deep that may cause structural problems. However, you need to check the case bore. It looks to me that the bearing has some play along the crank axle, seen on the bearing seat in the picture. It might be just the camera but you better check. |
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