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- Original Message -
From: "David Bruckmann" <[EMAIL PROTECTED]>
To: "Mercedes List"
Sent: Thursday, March 06, 2008 11:12 AM
Subject: [MBZ] 1983 300SD Shifting questions
> Not to split hairs, but your '78 300CD didn
your '78 300CD didn't have a vacuum modulator.
Actually, it did. The PO had the engine and transmission replaced with one
from a newer car. It also had the benefit of pencil plugs. I know what you
mean regarding the adjustability of the control rod vs the vacuum
modulation. My second old cl
uch more pleasant to crawl under there and "see" what's up.
-Original Message-
From: Kevin Kraly <[EMAIL PROTECTED]>
To: Mercedes Discussion List
Sent: Thu, 6 Mar 2008 2:03 am
Subject: Re: [MBZ] 1983 300SD Shifting questions
Thanks, Jim. That's what I though
All the recent talk of auto transmissions. I must admit, I know very little
about them. Do any of the vacuum issues apply to the transmissions used in
the W124 gassers? Anyone care to give me a quick rundown on how they
shift? Thanks
Ed
300E
On 06/03/2008, David Bruckmann <[EMAIL PROTECTED]>
Not to split hairs, but your '78 300CD didn't have a vacuum modulator.
Non-turbo diesels up to 1979 used a control rod instead.
Having had three cars with the control rods and one with vacuum, I can tell you
that I prefer the control rod for adjustability. That having been said, the rod
setting
the control pressure cable is adjusted too tight
Kevin Kraly wrote:
> Here's a question I'm sure someone could answer or at least point me in the
> right direction. This wonderful 300sD of mine has been shifting abnormally
> since I've owned the car. The 1-2 shift doesn't happen until about 22
> to check on that just to see if the ALDA is getting a proper boost
> signal, which affects the transmission signal in some fashion.
Indirectly. The tranny linkage is set for the expected amount
of torque versus throttle position, and with a bad ALDA system
you end up stepping on it more than yo
> Thanks, Jim. That's what I thought, and the throttle linkage setup
> sounds
> like the most sensible place to start. I think that this tranny
> (722.3xx?)
> also has a control cable for shift timing. Now that spring is on its
> way,
> it'll be much more pleasant to crawl under there and "se
The boy's SD was running and shifting weirdly, turned out to be the hose
from the back of the manifold to the ALDA was goobered up. Might want
to check on that just to see if the ALDA is getting a proper boost
signal, which affects the transmission signal in some fashion. Anyway,
cleaning out
Thanks, Jim. That's what I thought, and the throttle linkage setup sounds
like the most sensible place to start. I think that this tranny (722.3xx?)
also has a control cable for shift timing. Now that spring is on its way,
it'll be much more pleasant to crawl under there and "see" what's up.
> The 1-2 shift doesn't happen until about 2200RPM
> but will wait until 3500 RPM at 90% throttle or better. When driving
> with a
> light foot (2200RPM engagement), 2nd gear comes in VERY HARD, but it's
> better at full throttle. 2-3 seems relatively normal, but the3-4 shift
> occurs either at
Kevin,
I think you answered your own question Check the vacuum
lines for leaks as well as at the shift modulator!
Hope this helps...
Chuck
Phoenix AZ
On Mar 5, 2008, at 9:27 PM, Kevin Kraly wrote:
> Here's a question I'm sure someone could answer or at least point
> me in the
> rig
Here's a question I'm sure someone could answer or at least point me in the
right direction. This wonderful 300sD of mine has been shifting abnormally
since I've owned the car. The 1-2 shift doesn't happen until about 2200RPM
but will wait until 3500 RPM at 90% throttle or better. When drivin
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