There are only two ways to change the calibration on the odometer. The first is
to install?bigger or smaller wheels?or tires and the second is to change the
pinion gear?in the trans. The direct drive setup dictates?the speed of your
cable?and your?odometer?so they?are not capable of increasing or decreasing on
their?own. The odometer assemblies?do occasionally fail?but?when that
happens?you?are more likely?experience a dead odometer than?you are an
erroneous one.?On the other hand,?the pointers on both your?speedo and your
tach can and will change?over?time but those changes are brought on by wear and
tear that?take years to accumulate so any reputable overhaul should last you
a?minimum of?10 years.
Hope it helps
Jon
-----Original Message-----
From: Gary and Cindy Ault <aultgc@att.net>
To: Hoon Kim <hoon@pixar.com>; Roadster mailist
<datsun-roadsters@autox.team.net>
Sent: Wed, 13 May 2009 7:44 pm
Subject: Re: [Roadsters] New Transmission in, now a few questions
Hoon,?
?
I have a '66 1600 which I bought from the original owner in 1971. The original
speedometer went out of calibration -- at 75 mph it read 100. I had it
professionally recalibrated, and it slowly went out again. Back when speedos
were a lot cheaper, I went through two more new ones. Now I drive by the tach:
With my 3.90 rear end and 185/70 R14 tires, 4000 rpm in 4th is about 78 mph.?
?
If you have a GPS unit, or can borrow one, which gives speed readings, you can
"calibrate" yourself at various engine speeds in various gears. Should be close
enough if you're not Speed Racer.?
?
Check both Dean's and Dann's websites. I think both have various pinion gears
for sale. But don't be surprised if the correct pinion gear does not solve your
problem.?
?
If anyone out there knows of someone who can calibrate early speedos so they
stay in calibration longer than a year or so, I love to hear about them.?
?
Gary?
(219) 322-1923?
'66 1600/U20 SPL311-05917?
'67 2000 Solex SRL311-00428?
?
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