[W126 Coupe] 7" of play in park

[Chet Hwilka]

I would imagine any wear or damage of the pawl, pawl shaft, spring, etc
could cause the pawl to miss a notch causing the car to roll 5-7 inches
instead of 2-4 inches.  And if it's really bad, not catch at all.

Chet

 

 

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Elm Zobens
Sent: Tuesday, September 15, 2009 9:46 AM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] 7" of play in park

 


This is an outstanding diagram and proves my point.

Item 73 and 74 are hardened steel. As you can see in this diagram, there is
really nothing tho 'wear out'. It either works or it's broken. 

If the pivot point of the pawl is worn in the transmission case, your car
would have been abused at some point to cause this and should have been
noticed during the rebuilt. 

These things just don't wear out in normal use. 

Check for excessive play in the the rest of your driveline-

Elm

 



--- On Tue, 9/15/09, Dick Spellman <dick.spellman at gmail.com> wrote:


From: Dick Spellman <dick.spellman at gmail.com>
Subject: Re: [W126 Coupe] 7" of play in park
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Date: Tuesday, September 15, 2009, 8:28 AM

Good point Chet.

It could well be a combination of the parking pawl and the flex disks on the
drive shaft being worn, with the flex disks being the first and easiest
thing to check.  They'd have to be in really tough shape to add so much
travel but, it is possible.  I'd check for travel on the drive shaft in park
and watch the disks for slop, cracks and hence a lot of play.  You'd feel a
clunk when going into drive (D,R) gears in this instance too.

Dick

Chet Hwilka wrote: 



In case anyone wants to see what's going on..

74=parking pawl

73=locking gear

 

I would think 7" of roll once lever is placed in Park and foot is removed
from brake is excessive and something is worn.  Even my car with over 220k
miles only rolls an inch or 2 max.  And once the parking pawl engages,
rocking the car forward and backward should result is hardly any movement.
If there is, I'd then suspect worn or failing drive train couplings
components.

 

Chet

 

 

  _____  

From: mbcoupes-bounces at mbcoupes.com
<http://us.mc816.mail.yahoo.com/mc/compose?to=mbcoupes-bounces@mbcoupes.com>
[mailto:mbcoupes-bounces at mbcoupes.com
<http://us.mc816.mail.yahoo.com/mc/compose?to=mbcoupes-bounces@mbcoupes.com>
] On Behalf Of Elm Zobens
Sent: Tuesday, September 15, 2009 8:07 AM
To: mbcoupes at mbcoupes.com
<http://us.mc816.mail.yahoo.com/mc/compose?to=mbcoupes@mbcoupes.com> 
Subject: Re: [W126 Coupe] 7" of play in park

 


I think we may all be interpreting the information differently.

Perhaps we need to rephrase the question to 560secfl:
Does the car roll 7" between the time the car is placed in Park and the
transmission locks (normal) OR when the car IS already locked in Park, you
can roll it 7"?

Depending on the scenario above, you may or may not have an issue.
If it rolls 7" between placing it in Park and before the car locks, this in
NOT an issue.
If it rolls 7" once it's locked in Park, you may have something going on but
again, I would inspect your driveline play (U-Joints and Rear Axle) before I
suspect the trans.
Parking pawls normally don't 'wear'. The either work or they don't
(breakage).
Slop or play in the Park mechanism should not increase appreciably with age
or mileage (as Johnathan confirmed in his S&G test).

If you just spent 2K five months ago on this trans and the Pawl is now
defective, I'd shoot your mechanic. The Park mechanism should outlast the
life of the transmission/car in normal use.

Start with the low hanging fruit first- Please clarify which scenario you
are seeing the 7" play and then troubleshoot accordingly. Since the
transmission was just done by a (hopefully) competent mechanic, I would
check the other potential culprits first.
Elm

 

--- On Mon, 9/14/09, Dan Landiss
<http://us.mc816.mail.yahoo.com/mc/compose?to=dan@landiss.com>
<dan at landiss.com> wrote:


From: Dan Landiss
<http://us.mc816.mail.yahoo.com/mc/compose?to=dan@landiss.com>
<dan at landiss.com>
Subject: Re: [W126 Coupe] 7" of play in park
To: "Mercedes Coupes Mailing Lists"
<http://us.mc816.mail.yahoo.com/mc/compose?to=mbcoupes@mbcoupes.com>
<mbcoupes at mbcoupes.com>
Date: Monday, September 14, 2009, 7:59 PM

Perhaps Mr. Pecarich is not aware that Jono IS an MBZ mechanic?

FWIW, my 560SEC rolled an inch or two in Park, but never six. I guess I got
one with extra teeth.........



on 9/14/2009 7:20 PM FPecar4525 at aol.com wrote: 

As I said before,  I have checked with a MBZ mechanic and the answer was
"The roll in park is normal. Mercedes uses very few teeth on their park lock
gear so you'll get some roll before the pawl engages."

 

Frank Pecarich

Ventura, California

-- 
 
--
 
Never argue with a dragon, for you are crunchy and taste good with ketchup.
 

 


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