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#1
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Should driveshaft turn at all (by hand)
I'm trying to assess the condition of my 93's U joints. I got under
the car and tried to turn the driveshaft by hand. I could turn it a little bit, I would say about 1/4" of travel measured at the surface of the shaft. Should I be able to turn it at all by hand? Thanks, John V |
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#2
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Should driveshaft turn at all (by hand)
JohnV@nn wrote:
> I'm trying to assess the condition of my 93's U joints. I got under > the car and tried to turn the driveshaft by hand. I could turn it a > little bit, I would say about 1/4" of travel measured at the surface of > the shaft. Should I be able to turn it at all by hand? > > Thanks, > John V > Not really. Each part between the trans output shaft and the axles has a very small amount of play required, like .005". All those areas wear over time. And they all add up. Even in a new car, you'll be able to move the driveshaft a slight amount. Slight. 1/4" is too much. Grab the pinion flange and see how much that moves. -- ..boB Arrived: 2006 FXDI, Red. 1997 HD FXDWG - Turbocharged Stolen 11/26/05 in Denver 1HD1GEL10VY3200010 CO License J5822Z 2001 Dodge Dakota QC 5.9/4x4/3.92 1966 Mustang Coupe - Daily Driver 1965 FFR Cobra - 427W EFI, Damn Fast. |
#3
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Should driveshaft turn at all (by hand)
In article > , .boB wrote:
> JohnV@nn wrote: >> I'm trying to assess the condition of my 93's U joints. I got under >> the car and tried to turn the driveshaft by hand. I could turn it a >> little bit, I would say about 1/4" of travel measured at the surface of >> the shaft. Should I be able to turn it at all by hand? > Not really. Each part between the trans output shaft and the axles has a very > small amount of play required, like .005". All those areas wear over time. And they > all add up. Even in a new car, you'll be able to move the driveshaft a slight > amount. Slight. 1/4" is too much. Grab the pinion flange and see how much that > moves. He's not looking at fore-aft movement, but rather backlash. By grabbing the drive shaft and turning it, he's measuring the backlash of the entire driveline by feel. There really isn't a spec for turning it like that because each part is usually measured indiviudually. I've done this on occasion, and I would say that along the circumference of the drive shaft, it sounds pretty normal. The shop manual I have shows a method to measure backlash of the rear axle. Along the tire at the specified circumference with the specified torque applied, 1 inch or less is considered normal. |
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