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  #16  
Old 07-20-2011, 12:11 PM
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The only vehicle I have ever had this on is a 1954 F500 Ford Stake bed with hydraulic lift gate on the back..

It only starting happening after I drug an 8 foot by 8 foot by 2 ft concrete block from the front of the property to the back... the long way to avoid messing up the driveway... close to 2000 feet....I had to keep going because I was at my limit for pulling it anyway.. I could not count on being able to stop and let stuff cool and get started again...
In other words... I burned the clutch and probably warped the friction disc part of the flywheel....

This is the same effect you get from warped rotors on disc brakes... a pulsing effect... It would not take that severe a situation to burn a car's clutch and flywheel...

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  #17  
Old 07-20-2011, 12:43 PM
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Anti jerk valve??...Thats a new one one me, but theres never an end to learning new things about these cars. The only thing that comes too mind is the little "shock absorber" thing on the IP linkage of my later 123s. It does make shifting noticeably smoother. I think this is particular to manual cars but not sure. Certainly not in the "valve" category.
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
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1964 Allice Chalmers D15 tractor
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  #18  
Old 07-20-2011, 07:40 PM
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I noticed that some european model W123s with manual transmissions have a mini shock absorber mounted on the IP throttle linkage... so maybe that's the "anti-jerk valve".
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  #19  
Old 07-23-2011, 05:38 PM
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Any news on the jerky IP?
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1985 Euro 240D 5 spd 140K
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

"Lifes too short to drive a boring car"
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  #20  
Old 07-23-2011, 07:09 PM
1985 190d
 
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So this car is a conversion from automatic and not a factory installed manual transmission. I wonder is the flywheel is a part of this; my understanding is that the flywheel is different from manual to automatic. Perhaps it supplies inertia where its needed? WOuld a heavier flywheel be a good thing or a bad thing?
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  #21  
Old 07-23-2011, 11:23 PM
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the flywheel from an automatic could not be mated to a manual tranny so I dont think that could be the problem.
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1985 Euro 240D 5 spd 140K
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

"Lifes too short to drive a boring car"
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  #22  
Old 07-23-2011, 11:46 PM
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Quote:
Originally Posted by bmwpowere36m3 View Post
I noticed that some european model W123s with manual transmissions have a mini shock absorber mounted on the IP throttle linkage... so maybe that's the "anti-jerk valve".
My former 190D 2.2 had the factory 5 speed. I had the damper on the throttle linkage at one time, but was removed. I only remember having the bucking problem a few times, so I was just a little more careful with the throttle and clutch.
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  #23  
Old 10-20-2011, 11:01 PM
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Hi to all , I am new to this forum ,I fond this thread and I relait to the same problem , I have a 86 190D whit a 5 speed transmission so far I deed :
-Replaced Injection pump whit a rebuild unit.
-Replace injectors
-Replace chain tensioner
-Replace clutch / pressure bearing / pressure plate / shaft bearing
-Replace flex joint rear and front
-Replace center shaft bearing
-New shacks / new tires
-New motor mounts
-I remove the harmonic balancer from the shaft It was in pretty bad shape.
All the above done and I have the same problem.
I don't have a damper on the throttle linkage , I don't even have a mount for it .
tinker_er you have found the problem ?
I suspect the timing device but again just under 50% , this jerkin drives me crazzy .
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  #24  
Old 10-20-2011, 11:36 PM
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In Germany we called it the Bonanza effect.
I don't remember what Mercedes did to fix the problem.
I think they installed a damper/shock in the gas linkage somewhere on the injection pump.
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  #25  
Old 10-20-2011, 11:39 PM
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I don't even have a mounting point for the shock
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  #26  
Old 10-21-2011, 09:25 AM
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Quote:
Originally Posted by Stevo View Post
I think I know what you mean, I have a few manual 240Ds so I have something to compare. My Euro 85 (125K) will do that "springy take off" just as you describe but mine doesn't sound as bad as yours. It feels like weak clutch springs to me , my 79 (with 50K on clutch) will do it if I dont have RPMs up Its not a big deal and doesn't happen until I get sloppy with my shifting. My wife complained about it once, she pays more attention now
I get the same on my manual 240, my mech buddy also said weak clutch springs can cause that.
There is an "anti-jerk" shock on my IP.
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Last edited by fruitcakesa; 10-21-2011 at 09:28 AM. Reason: more info
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  #27  
Old 10-21-2011, 09:36 AM
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anti-jerk

Also check the "butterfly" to make sure it is connected. It is the big flap in the air intake . . . if it is disconnected, it will cause that symptom also. I had a valave job done, replaced the timing chain and components, and a clutch job done all at once, and the mechanics forgot to hook some things up. Consequently, I had some jerking motion going on. Once we hooked up the "butterfly" everything smoothed out. Also, is it possible your cruise control is stuck "on."?
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  #28  
Old 10-21-2011, 11:42 AM
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You/ve gotten some good responses in this thread.

Start by putting a floor jack under the front of the differential, not on the flange, but the case, and GENTLY lift upwards. Do not raise the car with it, just lift upwards and see if you get much movement. If you do, the problem is your differential mounts.

Also check your rubber driveshaft discs and u-joint.
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  #29  
Old 10-22-2011, 10:25 AM
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I have the exact same problem with my 1984 190D. Have 5spd from the factory in mine. Have not solved the problem. Usually avoid it by careful driving. I like the idea about the small damper in the throttle linkage.
Was thinking about changing the flex disks probably would not make difference though.
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  #30  
Old 10-27-2011, 10:11 AM
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What that "butterfly" do ? and who regulates it?
-----
Thx Larrie,
I am gonna check that , my flex joints are brand new.

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