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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Vibrating Driveshafts
On Fri, 14 Feb 1997, Dan Jensen wrote:
> One note of caution when replacing the drive (propeller) shaft U-joints,
> center bushing, etc. on the XJ6 and XJ-S. It is a split shaft that is
> balanced with the halves together. Be certain to mark the relative location
> of all components: front and back halves of forward shaft (the half with the
> splines), and forward shaft-to-rear shaft). I would use a metal punch or
> marking paint. I did not do this before replacing the driveshaft center
> support bearing on one occasion in the past and did not assemble them in the
> balanced condition. When accelerating from a dead stop, it practically shook
> my teeth out.
Dan,
The vibration experienced when accelerating from a dead stop,
especially at low speeds and high throttle inputs, is not caused by an out
of balance driveshaft. I've gone 'round and 'round this problem with my
sedan, until realizing that it was due to a driveshaft which was out of
alignment.
The 2-piece shaft, by virtue of the fact that it has 3 u-joints,
is prone to high cyclic internal stresses. At risk of turning this into
the "math-lover's" list, I will spare the trigonometric derivation. Only
proper driveshaft alignment will minimize this type of vibration. Haynes
and factory workshop manuals stress the importance of this.
Driveshaft vibration due to an out-of-balance condition is still
an important consideration, and will occur at higher speeds.
Greg
Greg Meboe meboe@atc.boeing.com
Web site>> http://www.scs.wsu.edu/~meboe
Mechanical Engineer -- Boeing 777 16g Seats
'85 XJ-12 H.E. (daily) '67 Spit-6 '74 TR-6
References:
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