[W126 Coupe] Transmission Changing Gears with a Bang

[Dick Spellman]

Hi Ernie,

On my 380 and 500 motors (I don't have a 560) the back end (nearest 
firewall) of the intake manifold has a metal tap and metal line that 
runs under the exhaust cross-over pipe where the vacuum line to 
transmission attaches.

All you need is to connect the line from the transmission to any vacuum 
source on the intake.  I would however expect that you will have a leak 
if you do not find the original take-off point for the vac line.

I'd be looking using a strong beam of light right at the center (right 
to left) rear of your motor just where the intake manifold falls away 
and you see your exhaust crossover and then transmission bell housing.

Regards,

Dick

On 11/19/2010 9:49 PM, Ernie Stephens wrote:

> Dick,

> Is it in-between the firewall or above somewhere closer to the carb? 

>  I've  cleaned the area up with cleaning fluid looking for a shining 

> post or that black rubber connector but I am somewhat vision 

> challenged . . .I wear glasses and the spray mist from the compressed 

> air blasted solvent on the eye glass lens doesn't help matters if you 

> know what I mean.

>

> Sent from my iPad

>

> On Nov 19, 2010, at 6:56 PM, Dick Spellman <dick.spellman at gmail.com 

> <mailto:dick.spellman at gmail.com>> wrote:

>

>> Ernie,

>>

>> The vacuum hose with black rubber adapter will connect to a metal 

>> tube stubbed out on the driver's side intake manifold.  So, if you 

>> have the tube in hand without the black rubber connector, look for it 

>> with an open end on the manifold.  It will either be a single or T 

>> rubber adapter.  If the rubber is on the vac tube in your hand, look 

>> for the metal stub that will be bare and sucking air on the driver's 

>> manifold.

>>

>> Now you know what the function of the transmission vacuum modulator 

>> is...smooth shifting vs. the hard bang at shift points.

>>

>> Regards,

>>

>> Dick

>>

>>  oter it willOn 11/19/2010 8:06 PM, Ernie Stephens wrote:

>>> Hey Michael,

>>>

>>> You are right!  Found the connection point at the tranny but not the 

>>> engine . . can you tell me where they hid the connection point at 

>>> engine?

>>> Thanks,

>>> Ernie

>>>

>>> Sent from my iPad

>>>

>>> On Nov 19, 2010, at 5:09 AM, Michael Ramay <mike.ramay at gmail.com 

>>> <mailto:mike.ramay at gmail.com>> wrote:

>>>

>>>> Check the vacuum line from the back of the engine to the driver's 

>>>> side of the transmission. Betcha it's loose.

>>>>

>>>> On Thu, Nov 18, 2010 at 10:48 PM, Mister McGoo 

>>>> <eelploot at hotmail.com <mailto:eelploot at hotmail.com>> wrote:

>>>>

>>>>     Did you accidently disconnect a vacuum hose to the

>>>>     transmission?  - Bellamy

>>>>

>>>>     ------------------------------------------------------------------------

>>>>     From: stevetsg at msn.com <mailto:stevetsg at msn.com>

>>>>     To: mbcoupes at mbcoupes.com <mailto:mbcoupes at mbcoupes.com>

>>>>     Date: Thu, 18 Nov 2010 21:26:05 -0700

>>>>     Subject: [W126 Coupe] Transmission Changing Gears with a Bang

>>>>

>>>>

>>>>     Ladies and gentlemen,

>>>>     Wouldn't you know it; a couple of hours ago I had just finished

>>>>     changing the oil pan gasket, replaced the neutral lockout

>>>>     switch, tightened what I think is the oil pressure switch

>>>>     to keep it from leaking oil, and replaced the steering damper. 

>>>>     So, I clean up the mess, get in the car to take it for a

>>>>     spin and the first thing out of the driveway "bang" as it

>>>>     shifts into 2nd gear, and bang again as it goes through each

>>>>     shift..  I did feel a bit of a hard shift before I put the car

>>>>     up on jacks but something happened dramatically in the course

>>>>     of a few hours on the jacks; did I break something when I

>>>>     jacked the car up or did I disconnect something unknowingly?. 

>>>>     I only lowered the transmission enough to remove and replace

>>>>     the neutral switch!  Any ideas? I had this transmission rebuilt

>>>>     at 99k and it is now at 214k.

>>>>     Ernie

>>>>

>>>>

>>>> The MB Coupes Website!

>>>> W126 SEC Mailing List

>>>> Postings remain property of MB Coupes, L.L.C.

>>>

>>>

>>> The MB Coupes Website!

>>> W126 SEC Mailing List

>>> Postings remain property of MB Coupes, L.L.C.

>>

>> The MB Coupes Website!

>> W126 SEC Mailing List

>> Postings remain property of MB Coupes, L.L.C.

>

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20101120/feb834a1/attachment.htm>