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  #1  
Old 04-10-2013, 03:26 PM
BenzDieselTuner's Avatar
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123 series - Old Style cruise control system

anyone want to tell me about it ? how does one fix it up ? if i remember correctly, someone told me that if the "cable puller" is bad, that you need a new one then, and they almost always go bad.....is this true ?

any input is appreciated, one of these days i would like to use my CC, so its time to start figuring out how it ticks...

EDIT : and i am right that the "idle speed control knob" somehow works over this CC servo, pulling on the cable a bit to increase idle speed ? i cant see any other way it could work, unless my car has stuff missing from the linkages and cables.....
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  #2  
Old 04-10-2013, 10:54 PM
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I think it;s like a lot of older electronics. Caps go bad. The amplifier develops issues with caps or resisters going out of spec over 30 years. There is a guy on here who rebuilds and troubleshoots them. I think Charmlu VS-tech can point you to him.... I know there have been prior threads about this.
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  #3  
Old 04-10-2013, 11:16 PM
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The older 10-pin cruise control system uses a vacuum device to pull the cable and thus set the throttle. A lot of times that device will leak and you will not have cruise. What also can occur is your cruise amplifier develops a cold solder joint and/or the capacitors on it fail.

I normally repair the 14-pin units as I've developed a test harness and setup to test and ensure that they work.

I have worked on a few 10-pin units (I think 5-6 so far), the only way I have been able to test them is to send them back to their owners and have them install the amplifier. So far each unit has been successful. Since I can't test them I don't ask much money for the repair work vs the 14-pin units.

One day I will make a proper test setup for them but I just haven't gotten to them.

So if I were you I would first check out the amp, its going to be cheaper to replace/repair than the vacuum servo is. I think a new/replacement servo is >150? Its been a while since I looked.
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
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  #4  
Old 04-10-2013, 11:53 PM
TwoDoorDiesel
 
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Idle control is a separate cable and linkage setup from the CC. If you don't see another cable attaching to the linkages inward from the cc cable then you are missing something. Cable and knob assembly is easy to find and/or rebuild. Other pieces that attach, no so easy.
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  #5  
Old 04-11-2013, 10:06 AM
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On my 85 Euro TD I went to the Rostra GlobalCruise electric cruise control using the OEM stalk and spedo pick up. Works very nice. Rostra Global Cruise Install Thread
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  #6  
Old 04-11-2013, 09:43 PM
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good thread about that rostra system.....thats worth looking into....

i am going to take the unit off the car, since it doesnt work and isnt hooked up anyways, and open her up and see how she looks inside....
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-Justin

I believe in extreme automotive perfection whenever possible.......there is no such thing as "It doesn't matter" !!!

1985 300 CDT - 287k miles

1980 240 D - 340k miles

With extras !!

http://facebook.com/BenzDieselTuner

http://facebook.com/SWFLAlternativeFuelsClub

http://facebook.com/SWFLBenzClub

http://SWFLBenzClub.com
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  #7  
Old 04-11-2013, 11:09 PM
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Answer

Quote:
Originally Posted by BenzDieselTuner View Post
anyone want to tell me about it ? how does one fix it up ? if i remember correctly, someone told me that if the "cable puller" is bad, that you need a new one then, and they almost always go bad.....is this true ?

any input is appreciated, one of these days i would like to use my CC, so its time to start figuring out how it ticks...

EDIT : and i am right that the "idle speed control knob" somehow works over this CC servo, pulling on the cable a bit to increase idle speed ? i cant see any other way it could work, unless my car has stuff missing from the linkages and cables.....
I assume you are talking about the Bowden cable (coffee can) unit.

Mercedes Benz issued a TSB (still in effect) between 1981 - 1983 to disconnect them from the throttle linkage.

They are notorious for locking at full throttle with no warning, often damaging the engine.

New Mercedes 240D 240 D Cruise Control Vacuum Actuator for Manual Transmission | eBay

Mercedes Manual Transmission Cruise Control Actuator 240D 300D 123 | eBay


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  #8  
Old 04-12-2013, 12:18 AM
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Thanks for posting this Roy, first I have heard about this. Our 80 240 has this unit. It will speed up if I hold the lever, but when I let off, it won`t hold.

So with this new but of knowledge, it is going Bye Bye.

Charlie
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  #9  
Old 04-12-2013, 12:43 PM
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Good

Quote:
Originally Posted by charmalu View Post
Thanks for posting this Roy, first I have heard about this. Our 80 240 has this unit. It will speed up if I hold the lever, but when I let off, it won`t hold.

So with this new but of knowledge, it is going Bye Bye.

Charlie
IMO: The only reason to keep that system is for show cars, and I have gutted several units (to eliminate any possible function, but look pretty).

The after market options are better, if you need cruise control.

.
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1973 300D
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  #10  
Old 04-12-2013, 12:58 PM
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My TD never had cruise so I just installed the spedo pick up and stalk from a parts car and then the Rostra unit.
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1985 Euro 300TD 5 spd 218K
1985 Euro 240D 5 spd 120K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

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Old 04-12-2013, 12:58 PM
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