Trust, but verify.
--R
On 6/4/2010 2:48 PM, andrew strasfogel wrote:
The speedo cable is relatively new, replaced about 2 yrs. ago and maybe used
for 2k miles.
On Thu, Jun 3, 2010 at 5:59 PM, Rich Thomas<
richthomas79td...@constructivity.net> wrote:
Don't forget the cable too.
--R
On 6/3/2010 4:22 PM, andrew strasfogel wrote:
Actally, I was thinking just the opposite - that I needed to swap IN a
speedometer from an '85 W123 to mate up with the 85 transmission.
But regardless, I will definitely R/R the speedomter this weekend in hope
that, at a minimum, the wa, wa, wa screetching noise at high speeds goes
away.
On Thu, Jun 3, 2010 at 3:42 PM, Tim C<bb...@crone.us> wrote:
I believe the takeaway is: get a new speedometer assembly from an '84
or earlier 123 diesel automatic. Ebay that puppy, they were $50-$150
when I was looking.
If this is the noisy one, even better.
Alternatively, try taking it apart and cleaning it up first. Took me
about 30 minutes to dismantle, clean, and reassemble mine the first
time, so it's not a big commitment. I used synthetic bicycle grease I
already had.
-Tim
On 6/3/10, andrew strasfogel<astrasfo...@gmail.com> wrote:
CORRECTION: Should have written "OK - what is the takeaway message from
all
that learned discussion? Am I doomed to forever have an inaccurate
speedometer that reads too high (in mph and miles covered), or is there
hope
for an affordable fix?"
On Thu, Jun 3, 2010 at 2:50 PM, andrew strasfogel
<astrasfo...@gmail.com>wrote:
OK - what is the takeaway message from all that learned? Am I doomed
to
foreever have ain inaccurate speedometer that reads too high (in mph
and
miles covered), or is there hope?
On Thu, Jun 3, 2010 at 12:57 PM, Dillon, Meade M CIV
SPAWARSYSCEN-ATLANTIC,
53310<meade.m.dil...@navy.mil> wrote:
Sho'enuf, hat tip to Rolf (and Mitch). For a 123.133 the EPC shows
that
the speedo and the diff changed for '85, but no changes to the
transmission speedometer gears.
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rolf
Sent: Thursday, June 03, 2010 10:51 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] ISO a fix for lousy fuel economy in a W123
turbodiesel - with an incentive
I know for a fact that the speedo is matched to the rear diff and not
the transmission alteast in the W123 chassis. Feel free to research
it.
-Rolf
On 06/03/2010 10:46 AM, Dillon, Meade M CIV SPAWARSYSCEN-ATLANTIC,
53310
wrote:
I think that the issue is the drive gearing may be the same, but the
gear which drives the speedometer (in the tail of the tranny) varies
to match the differential.
The EPC can answer this question...
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rolf
Sent: Thursday, June 03, 2010 10:38 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] ISO a fix for lousy fuel economy in a W123
turbodiesel - with an incentive
That is pretty much correct. The speedo is based on the rear diff not
the trans. The automatics are all the same (for the w123) gearing and
all the four speeds end in 1:1 gearing. The manuals differ from year
to year based on engine and reivisions.
-Rolf
On 06/03/2010 10:35 AM, Mitch Haley wrote:
Jim Cathey wrote:
No, I correct myself. The speedometer is attempting to measure
wheel
RPM, but it's tapped at the tranny tailshaft. The 85 tranny is
_expecting_ to have a lower tailshaft RPM for a given road speed,
and
so gears up the speedometer tap to make up for it.
You put that tranny in a car with a shorter rear end, and the
tailshaft RPM is higher than expected, and so is the speedometer
output.
I thought the MBZ way was to have the trannies all alike, and match
the speedometer head to the differential gearing.
Mitch.
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