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Topic: can anyone help
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Page 1 of 1 of 6 replies
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May 11, 2009 at
11:42:32 PM
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05/11/2009
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5
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I run a limited sprint car out of florida and run an external coupler rear end but keep breaking drive shafts in the past 7 races ive broke 2 drive shafts and a lower shaft does anyone know what could be the cause of this?
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May 12, 2009 at
08:54:06 AM
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Joined:
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11/30/2004
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1973
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Probably an alignment problem, either a bent snout on the rear end or a bent torque tube....
Chuck.....
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May 13, 2009 at
01:06:41 AM
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09/30/2005
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1387
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id have to agree with 25, Did you have a tuff time getting the car squared?, the quickest way I can think of is to check measurements on the snout portion of the tube, pull tube off rearend and rotate 90 degrees and compaire your measurements again? ths might tell you if the tube is damaged quickley? otherwise I would personally take the tube to the local machine shop and have them spin it on the lathe to check runout , this problem could be a combination of things and hope I dont experiance it, is the shaft the proper length?, how do the splines look on the broken shafts? , torque ball and housing in good shape ? for one, be thankfull its a shaft , and not your ankles broken, definetly try to purchase new products for your driveline if possible ,make sure the face of the snout is true, I hope your broken shaft woes clear away, this could be a Huge problem for wallet and more importantly your legs . Im curious what you find.
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May 13, 2009 at
09:38:44 AM
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11/30/2004
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1973
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And you might check the length of the driveshaft that you've been running; it might be too long, since it did break your lower shaft...
Not to point fingers. but the concern I've always had with used parts is "what did the previous owner do to the part?" and "did he do it correctly?"....
Chuck.....
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May 13, 2009 at
02:37:10 PM
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12/03/2004
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375
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If the shaft was too long, you better be checking the other end too.. Meaning the thrust brg for the crankshaft.
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May 13, 2009 at
05:15:47 PM
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Reply to:
Posted By: Ken#9 on May 13 2009 at 02:37:10 PM
If the shaft was too long, you better be checking the other end too.. Meaning the thrust brg for the crankshaft.
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I dont even want to think about that, just the thought is starting to grose me out, Ive heard the horror stories of loss of thrust in a crankshaft, and possible trouble with this issue, the results were spendy, Its proubly not a bad idea to get the filter cut and look it over good . just to be safe.
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May 15, 2009 at
06:46:47 PM
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12/16/2006
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70
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Hey is this Mark Sr. or Jr. ? What broke last? If it was the lower shaft, that might have been bent all along causing the rest. When first put my car together, the lower shaft was slightly bent, and what made me notice it was the snout bearing was rocking back and forth when I spun the shaft. Somebody else mentioned a bent snout, good possibility if that rear has been crashed. If the axle won't square up with the rear torque tube flange centered in the frame (measure off a straightedge on the outside of the frame), then the snout (or torque tube) is probably bent. Otto can check the tube or either shaft in a lathe with a dial indicator to see if they are straight. Old Speedway catalogs used to have a chart that showed driveshaft lengths for all different combinations, but I don't see it in my new one. Well, hope some of this helped, and good luck with it...
Later, John
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