Subject: Time:12:05 PM
OFFICE MEMO Re>Spitfire driveshaft Date:5/19/94
Olin Kane wrote:
>I have a '67 Spitfire Mk II that I've had a lot of trouble getting the
driveshaft (OK, propeller shaft) balanced. I still get a noticeable vibration
at around 50 MPH and above (used to occur at 35 MPH and above).
And William Woodruff added:
>Also, is the face of transmission output flange parallel to the differential
input flange? Poor alignment here can be caused by a number of things,
including bad engine mounts. If they aren't parallel, the u-joints will wear
out quickly and can cause a vibration.
Now I add:
Yes, another way of putting it is the trans output shaft and diff input shaft
must be parallel, or close to it.
Also check that your U-joints are in proper alignment with each other, that
is, that the two yoke ends of the driveshaft are co-planar, not twisted at some
angle. One degree of misalignment is probably permissable. A 90 degree twist
would be the worst case. Could you have assembled it off by one or two splines?
Or has it been welded up wrong?
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