Hi Dennis
The o/d speedo may well have been different, it may be possible to get the
ratio right by changing the pinion on the speedo output, you will need to
count the teeth on the non o/d both the spiral on the output shaft and the
pinion and then look at the o/d, J types generally have either a 5 or 6
stamped on them near the speedo pinion, this refers to the number of starts
on the spiral then do the maths to work out what teeth you need on the
pinion to get the correct ratio! Although the o/d is designed to engage
under full load, (and you may find it feels smoother if you do that) you can
ease the situation by making a half push of the clutch pedal, this would be
purely for your benefit unless the rest of the drive line is in poor shape
in which case it would reduce the tendency for the backlash in the system to
bang.
Graham.
----- Original Message -----
From: <dncullig@us.ibm.com>
To: <triumphs@autox.team.net>
Sent: Wednesday, May 10, 2000 4:06 AM
Subject: O/D changes speedo?
>
> OK, the J-type overdrive tranny is in and it WORKS! I took the car
> down to Britfest 2000 in NJ on Saturday - 230 miles round trip with no
> problems, but I do have a couple of questions:
>
> 1. With the new tranny, my speedo now reads WAY higher than it did
> before, even when the O/D is not engaged. Before, 3000RPM in
> 4th gear was 60 mph - now 3000 RPM shows 67-68 MPH (but I'm
> quite certain I'm not going that fast). The angle drive is new,
> nothing
> else was changed. What's causing this?
>
> 2. No matter whether I let up on the gas or keep steady pressure, the
> O/D seems to lurch into gear when I hit the switch (this happens in
4th
> gear - I never tried the O/D in 3rd). The downshifts when I turn it
> off
> are real smooth, but activating the O/D almost seems to make the
> car leap. Am I doing something wrong and/or is there an adjustment
> that can be made?
>
> Dennis Culligan / 1976 TR6 CF57948U(O) - TR6IUMPH / Highland,NY /
> DNCULLIG@US.IBM.COM
>
>
|