Terry, do you know anything about changing the speedo drives on later model
Nissans? this is a 90's model car my friend wants 17s on!
zac
----- Original Message -----
From: Terry & Heather <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, March 20, 2000 10:50 PM
Subject: Re: Fuel pressure & bloody speedo drives
> Pete,
> The pump I have to go in the 510 is off a Cressida Twin Cam ~86, and it's
the
> same as our 86 Crown Royal. The part number is 56200-0341. I'm told that
Mazdas
> also have a similar pump in size and function and it could be the same
pump as
> Denso electrics are common in them as well. It's like most things I guess
as
> for as size goes getting smaller all the time, I like it for the size and
ease
> of installation.
>
> On speedo drives, what a can of worms (no pun intended) those things are,
there
> are so many combinations of the drive teeth, diameter of external drive
and the
> number of worms and size of worm as well. The external drives are much the
same
> from 16-19 teeth for each of the internal worms except the length of the
> trunion and the spindle is different for a 5x or 6x worm. At 20 teeth or
above
> the diameter of the external toothed drive is bigger and the internal worm
> drive is smaller and they are NOT interchangeable. If your original drive
was
> 19 teeth or under, then a 22 tooth is going to need a worm drive change is
what
> i'm saying and it's a bugga of a job, is it worth it. This is what i was
faced
> with for the FJ box when i changed to a 3.9 diff ratio which requires a 20
> tooth drive and the original drive in mine is 19 teeth. After borrowing
drives
> and looking at parts books it all got tooooo hard and to say that i was
pissed
> off with it is an understatement, so i shoved the standard drive back in
and
> decided the next best thing was to look up a mate who is an instrument
tech as
> he used to do speedos for police cars. He did my speedo gratis but he said
it
> is worth ~$60 for a primitive 1024 speedo, the down side of doing it this
way
> is the odo is not touched but as mine would only be out by around 5% at
that
> stage i couldn't have cared less if the bloody didn't work at all. In
hindsight
> I can see why it's rare to get the speedo corrected, it should have been
easy
> but evidently not always.
>
> I reckon you can do minor changes to a 1024 speedo yourself. All they do
is to
> adjust the pre-tension on the hairspring, it works best is the speedo is
> reading high as the hairspring doesn't like being given less tension after
30
> years of zeroing to a specific point. The way they adjust them is
interesting
> to watch, they have a corrected speedo attached to a variable speed
electric
> motor, just hook your speedo up to the second cable and adjust it. They
adjust
> road speedos to read +3-4% to allow for dead accurate speed indicated with
new
> tyres on and the speedo gradually reads faster as the tyres wear.
>
> regards
> terry
>
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