purchased a 1981 240d with approx 170,000 and now have 181,000
right now I use it daily approx 140 miles

one of the things I noticed a few weeks ago, that the 'dash pot' or what seems to me is a little shock absober, is broken !

the bottom part no longer stays in place,

is it ok to drive with out a working dash pot?

bob 1981 240d 181,000

I own a 1980 240D and although my car does not have a vacuum "DashPot" device, I'm considering adding one to try and improve the shifting of the tranny.

Let me say that I'm not sure I understand what you mean when you say:
the "... little shock absober, is broken... the bottom part no longer stays in place,".

Another name for the "DashPot" is "vacuum surge dapener" which is to say that it delays the vacuum bleeding function of the Vacuum Control Vavle [VCV] which the DashPot is in series with. If you DashPot is broken in two, then I do not see houw your VCV can be doing it's job to simulate a smooth throttle opening and thus properly signal the tranny modulator when to shift.

No I do NOT think it "... is it ok to drive with out a working dash pot?"

Are we both talking about the same little plastic vacuum chamber that fits above the vacuum control valve [VCV] on the IP ?

Sam

no, i have a 4 apeed manual,

this part does in deed look like a shock absober (sp). will try and post a picture.

bob
1981 240D manual

First count your blessings you have a "stick shift"... for the vacuum thing I was going off on is largely unique to the automatic MBZs.

Back to your problem with what is more commonly called an "Engine Shock" or "Engine Dampener". If I were in your shoes with your nice stick model with that mileage and probably little knowledge of what has been repaired and what has NOT, I would:

(1) SEARCH the Diesel Discussion FORUM for THREADS on "motor mounts" or similar searches and glean as much as you can about these, and
(2) Take a close look at ALL your motor mounts [2 side type, front or center, and one at the rear probably on the tranny.

These 4-banger diesels tend to run a bit rough and that is one of the reasons your's has the engine shock... to try and make it run smoother.

So I would definitely persue the obvious which includes:
(a) Repair the engine dampener, and
(b) once you resolve whatever you resolve with (a), then you might want to consider the posibility that you might have a "power imbalance" due either to a fuel injector or something in the injection pump... a whole another world from engine mounts etc.

A good reference you might consider is one of the many parts websites... but this one has a great graphical interface... check out:
http://www.performanceproducts4benz.com/
and once there and after punching in your year/model etc, take a look in the left sidebar for a selection called "Shop by Schematic" which will introduce you to the graphical interface I like a lot. Once you click on this, you will need to look for a schematic/graphic group labeled "Engine 240D External" ... and once you find this you will need to play around with the blow-up graphic that is a great reference and way to spot things and for your car you should see that the engine shock/dampener and motor mounts are numbered 185 through 189. The parts carried by PerformanceProducts will be colored orange and have a description right below the graphic [you will need to play with this graphic interface to see how it works... but it's been a great resource for me to learn what parts are called!].
Motor mount parts are cheap [relatively speaking].
It looks like your engine shock [#186] on your manual tranny car is shown in detail at: http://www.performanceproducts4benz.com/productpage.aspx?pid=102206 and sells for ~$64.

I'm on the road and a bit disconnected from access to this FORUM so it will be a couple of weeks before I can really be more reliably helpful further help.
I hope this rambling has helped!
Sam

part number from the 'buy parts' tab.

part number is C7062-81623.

this part is suppose to part of the IP linkage system.

but, when I bought the car, the PO, said this is an engine from another 240d, and I am thinking that the other car was an auto, while mine is a 4 speed standard.

anyway the car runs, and when I take my foot off the 'gas' pedal, the engine slows down.

again, is this a critical part?

bob 1981 240d 180,000

can make quite a difference... and the language barriers we run into can also. In this instance we started talking about a "DashPot" which these car do have [vacuum dampers] and the dashpot turned out to be vibration shock on the engine!

Bob - I don't see the connection between the engine shock and "... IP linkage system...". Can you please clarify ?

I can understand that an engine taken from an auto tranny car might have a different arrangement with the engine shock system and how maybe a stick shift does not need one.

Puzzled,
Sam

[QUOTE=Samuel M. Ross;1263763]

Bob - I don't see the connection between the engine shock and "... IP linkage system...". Can you please clarify ?

There is a little "shock absorber' looking thing in the throttle linkage in back of the IP on my "85" manual 240D, I think thats what hes talking about. I seems the car would fine with the "reguler" linkage

__________________


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"

Bob [rkerste219] - Along with your post above you had an attached graphic that clearly showed a mechanical shock absorber part [I presumed was the engine shock or damper]. In the POST above as in your first POST you refer to what I know as either the "dashpot" or "vacuum surge damper/dampener".
I can give you advice about both of these but I find it confusing to speak about these together for it makes me uncertain which you are really talking about. So let's pick one and go with it... and then the other.

Stevo - Thanks for trying to help out with our language problem but you might have actually contributed to it instead. What you are calling
" little 'shock absorber' looking thing in the throttle linkage" I think is called either "dashpot" [the term Bob used in his very 1st POST] or "Vacuum Surge Dampener". This simple vacuum "DashPot" does NOT have any mechanical connection to the throttle or IP "linkage" but the Vacuum Control Valve [VCV] to which this DashPot does connect, well this VCV [a $200 piece of plastic] most certainly does.

I have actually been trying to get my hands on one of these to add to my 240D for I believe that these were designed to help delay certain auto tranny shifts... so let me say this in closing:

I have serious doubt that a vacuum dashpot would serve any purpose on Bob's 240D which is a stick shift with an engine that probably came from an automatic.

Concurrently, I would not be at all surprised to find that the stick shift cars had NO "engine vibration shocks".

But on both of the above I canNOT be certain for I am on the road and a bit hampered in confirming these.

Sam

If he is confused on this thread so am I. The engine shock and vacuum dash pot are 2 totally different items.

__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Diesel Giant,
You can probably help out here. We have a car that was and still is a stick shift but there was an engine replacement with one that most likely came from an automatic car.

The question is - for a stick shift car, should there be such parts as: Vacuum conctrol valve [vcv] on the IP, vacuum dashpot that usually sits just above the, and a completely separate issue is does a manual shift car need an engine shock?

I did finally find where engine shocks are listed for manual shift cars but the other vacuum parts I have mentioned just do not seem to be needed for manual shift... what do you say?

I'm on the road until 9/12 and canNOT really be of more help.
Sam

The miniature "shock absorber" on the injection pump is designed to slow the linkage down if you release the accelerator quickly. It is only fitted to manual transmission models and improves smoothness during shifting and creeping in first gear.

Some of the folks who have converted automatic 300Ds to manual trans report that the revs fall of too quickly, making smooth shifts difficult. They blame this on the turbo not "staying on boost." I think instead that the problem (minor or not) has to do with using the lighter 240D flywheel and not retrofitting this mini shock absorber to the IP linkage. The 300D manual cars from the factory (non-turbo, Europe-only) came with this dashpot.

For a thread devoted entirely to this discussion, see the dashpot: real reason turbo / manual cars weren't sold

Ted

__________________
1983 240D automatic, Orient Red, 174K
1983 240D manual, Biscayne Blue, sold at 341K

The language barrier was really working over time on this THREAD!
Sam

Junk says me, exactly the sort of picayune crap they installed on later models because somebody *****ed about pedal vibration, or maybe to accomodate crybabies who dont know how to feather the accelerator while shifting gears. No such silly dampener exists on earlier model '79. Without hesitation I'd pull it and throw it into the bushes, knowing the car will run fine without it.

thanks, mine has been off for the past week. I just kind of wanted to know what the 'thing' was suppose to do. yours is the best answer listed here.

bob 1981 240 D 4 speed manual

I have a car "with" and one "without", not much (if any) difference in throttle response.

__________________


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"