Ben -
BN1 overdrives have a special switch in them which
shuts the overdrive off if the Annulus isn't spinning
fast enough . I believe this switch (called the
centrifugal switch) is intended to disingage the OD
prior to downshifting with OD on so that the negative
force on the annulus doesn't blow out the carrier
assembly. If you did this, it would destroy the OD in
the BN1.
It is recommended to always switch your OD off while
you are still driving with speed. If you are coming
to a stop with OD on, you will be wearing out your OD
unnessesarily.
It sounds as if your centirugal switch is cutting out
the OD relays on too low of an RPM. it either needs
some adjustment or your OD relay points are too close
together.
It's not a major issue.
One last question... does the clicking happen when you
move the gear lever back and forth with your hand? if
so... this is normal as there is a cutout switch which
prevents you from puttting the OD on in 1st gear or
reverse. If this is the case, you have nothing to
worry about, it's normal.
At the end of the day, you should not be coming to a
stop with your OD switch on... switch it off before
you get below 35 MPH as a habit. it will last alot
longer that way.
Regards,
Alan
'53 BN1 '64 BJ8
--- Ben Prince <blprince2@comcast.net> wrote:
> I have a 1954 BN1 (154897). If I leave the car in
> overdrive and pull up to a
> stop light, one hears a clicking sound. Switching
> out of overdrive makes the
> clicking go away. It sounds like a run-away relay.
> (No, it is not the fuel
> pump making this clicking sound.)
>
> It is possible that the clicking also occurs when
> I'm on the road, and I can't
> hear it due to the road noise, but I doubt it.
>
> Per the manual, there are a number of overdrive
> relays and an overdrive
> solenoid. It would be appreciated if anyone can
> advise on how to diagnose the
> problem.
> Thanks,
> Ben
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