IML: Speedometer Adjustment

["Forwarded Message, See Email In Text" <gearhead@xxxxxxxxxxx>]

I believe there is an adjustment at the transmission, someone correct me if
I'm wrong, I haven't actually performed this procedure.
> From the way I understand it, there is a bolt that is removed that holds the
speedometer adapter to the transmission case. I think that this is a wheel
that has a number of bolt holes around it. I think it's turned one way or
the other to make small adjustments to the speedometer reading. It seems
that I've heard that each bolt hole indicates a 2-3mph change. The 1973
service manual shows on page 86,
http://imperialclub.com/Yr/1973/FSM/Chassis/html/21-086.htm
the adapter and the pinion teeth number ranges. On page 127,
http://imperialclub.com/Yr/1973/FSM/Chassis/html/21-127.htm
you will find the chart that shows which adapter range to use based on tire
size and axle ratio. You'll have to find a means to compare the old tire
size charts to the new metric sizing that is on your car now. I think that
LR78-15 size was standard on Imperials for most years since 1959.
As for how the adjustment works, I haven't been able to find it in the
service manual either. I think that either the hold down clamp wheel is
turned a number of bolt holes or the adapter is rotated a small amount in
the specified range of gear teeth. I'd be interested in hearing how this is
accomplished too, as my Newport reads about 8% faster than I'm going.

Eric
Portland, Oregon
______________________________________________________
Does anyone know that if my speedometer is off (it works and the tripometer
and odometer work) about 10-15 mph, is it just a remove and lube issue or
some kind of gear issue in the speedometer itself that needs to be sent off
and repaired?  Couldn't find anything on it in the archives.

Thanks
Mister Ed
'68 Crown Convertible 



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