Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Vintage Mercedes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-29-2018, 12:54 PM
Registered User
 
Join Date: Jul 2015
Posts: 131
Inclines and automatics.

Hi,

I have started driving the old girl a bit now after 30 years of no go. I am ironing out various things, most everything is working fine. I have never owned a car with an auto 'box before, so I am learning a few things..but I have a specific question..the car is in my sig, but it is an M116 engine 3.5 (1971) with whatever box that came with...

If I am on an uphill incline, steep or not, with the car in drive (or 4 as marked), and I have to come to a stop, the car will roll back. Is that normal? If not, is there anything I can do about it?

Thanks.

Dave
__________________
1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
Reply With Quote
  #2  
Old 06-29-2018, 01:17 PM
Tomguy's Avatar
Vintage Moderator
 
Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,086
Yes, 100% normal. All cars with automatics that don't have hill start assist do it, just not as badly as a manual trans would if you don't keep on the brake. If you're on a really steep hill, you might consider using two feet.
__________________
Current:
2018 Chrysler Pacifica Limited
1999 Chrysler 300M - 211,xxx

My Mercedes Benz 108 and 109 resource site

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
Reply With Quote
  #3  
Old 06-29-2018, 01:26 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,451
Quote:
Originally Posted by amazon69 View Post
Hi,


it is an M116 engine 3.5 (1971) with whatever box that came with...

If I am on an uphill incline, steep or not, with the car in drive (or 4 as marked), and I have to come to a stop, the car will roll back. Is that normal? If not, is there anything I can do about it?

Thanks.

Dave

The 'box is a 722.2xx.
The roll-back is normal; the 722.2, when brought to a halt, stops in 2nd gear, and hence less engine torque is applied to the driveline than if stopped in 1st gear. As soon as the throttle pedal is moved to start off, the 'box shifts to 1st. That shift from 2nd to 1st can usually be felt as a slight bump, if one is paying attention and opens the throttle slowly.
Reply With Quote
  #4  
Old 06-29-2018, 02:03 PM
Registered User
 
Join Date: Jul 2015
Posts: 131
Alright Thanks for the quick replies.

So I can stop worrying about trying to fix that then.

On another note, why would a downshift be more abrupt than an upshift?
It's all relative of course..upshifts are super smooth, hence I notice some downshifts more..

d
__________________
1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
Reply With Quote
  #5  
Old 07-01-2018, 07:23 AM
Registered User
 
Join Date: Jun 2018
Location: Australia, ex Sacramento but Ex New Zealander
Posts: 8
transmission shifts

New here, hello to all,have been with Porsche forum for years.
911 is just sold,just purchased a 230SL, on its way from US
im a Kiwi living in Australia.Will always try to be helpful on here. Dave when you drive a very high hill at lower speed ,just select it back to low on your auto box
that will also help ,as you move forward,move your selector back up to 4th.
As you mentioned with transmission smooth going up ,going down not so smooth,
that is normal,unless it is really bad,then get it checked.regards.Wayne.
Reply With Quote
  #6  
Old 07-01-2018, 03:26 PM
Registered User
 
Join Date: Dec 2010
Location: Ontario
Posts: 1,166
It's likely the throttle switch. This is part of the modulator solenoid on top of your transmission and if it's not set up correctly you will get a very pronounced clunk as your trans shifts from 3rd to 2nd gear while coming to a stop.

In many cases the actual solenoid is sized up and would need to be removed so it can be lubed and freed up. You can easily check to see if it's working by turning on your ignition and hitting your gas pedal until it pushes up against the kick down switch. You should hear an audible click if it's working. If not, check your fuses and whether you have power at the kick down switch.

Once you have your kick down linkage working you can then adjust the throttle switch so that a test light will go out just after you open the throttle. This will ensure that with your foot off of your throttle the kick down linkage should move to the rear position which will soften any down shifts.
Reply With Quote
  #7  
Old 07-01-2018, 03:34 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,451
BD:

You have described a transmission that is not installed in the OP's car. His is in the next series/design of transmissions; the 722.0/1/2 series. His a 722.2xx.
Reply With Quote
  #8  
Old 07-01-2018, 10:26 PM
Registered User
 
Join Date: Dec 2010
Location: Ontario
Posts: 1,166
Quote:
Originally Posted by Frank Reiner View Post
BD:

You have described a transmission that is not installed in the OP's car. His is in the next series/design of transmissions; the 722.0/1/2 series. His a 722.2xx.
I was responding to the guy with the 230SL. In that case my info would be correct for that car.

I generally never post about cars I don't work on or things I don't know about. Sorry if I jumped to a different question.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 02:33 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page