Mercedes W114 250 Coupe - help!

[C43AMG]

You all amaze me. Sherlock Holmes eat you heart out. Great work. Amazing !!!

 

[Druk]

Lovely, thanks Graeme.

Just spotted on ebay.de - an auto box with all the linkages. Rather helpful!

And what's the white gubbins top right in the pic and connected to the valve thingy bottom left on the gearbox for?




.

 

[Charles Morgan]

That's what I've been wondering too.

 

[grober]

That's the manifold end of the metal vacuum line from the transmission vacuum modulator[ valve thingy] leading to the manifold. It should be a banjo type union but has been modified with what looks like a bit of flexible hose and what I take to be what is called a vacuum dashpot

aka
Vacuum "DashPot"... aka "Vacuum Surge Damper"...
also called a vacuum surge damper but this is also commonly known as a "dashPot". Many parts house even know and sell them as "check valves" but THE ARE NOT a CHECK VALVE... and they do not have any internal diaphragm. They are a simple air/vacuum chamber with the connectors on each end possibly serving as restricted orifices. This vacuum components are installed primarily to retard/dampen the otherwise harsh 1-2 shift on automatic trannyies. I just tested one on both our 1980 240D and 300D [ not in these car's original design] and so my experience with them is fresh, but positive. They only cost $4 -to- $10.
You should be able to blow through them and not cause any damage for there is nothing inside to damage and I don't think your lung-power is enough to damage them... it is just a hollow chamber that acts to delay the vacuum bleeding action of the Vacuum Control Valve [VCV] on the IP. The VCV is the component most responsible for simulating throttle pedal position by controlling the vacuum signal that is sent to the vacuum modulator on the auto tranny.

you can actually see what look like a narrow vacuum pipe connection in the centre of the white thingy.
That's my guess

 

[Charles Morgan]

In case it helps, here's the ad.

The box number is listed as 114 270 1001027622.

 

[Bellow]

That's the manifold end of the metal vacuum line from the transmission vacuum modulator[ valve thingy] leading to the manifold. It should be a banjo type union

The banjo is still there I think...
Looking at the other end of the damper it appears that a male (hollow) stud emerging from the manifold is required. If so, there should still be a female tapped hole on the manifold and looking more likely it is on its underside.

 

[Charles Morgan]

I think it would sound so much better if it was a ukelele union...

 

[Charles Morgan]

A finger tip search reveals nothing on the underside of the manifold. That is confirmed by these photos of an inlet manifold. (it's rather useful on the throttle linkage though).

 

[grober]

The banjo is still there I think...
Looking at the other end of the damper it appears that a male (hollow) stud emerging from the manifold is required. If so, there should still be a female tapped hole on the manifold and looking more likely it is on its underside.

MIGHT BE ITEM 8 in this diagram then?altho where that is on the manifold

 

[Druk]

^ maybe #12 is a threaded blanking plug and it goes in there?

 

[Bellow]

Looking at the pic from ebay.de, it must mount in the vicinity of the dipstick's end. Unfortunately none of the engine bay pics show a dipstick! Presumably to the rear of the manifold - but that's mere guesswork. A rigid steel pipe shackled to the dipstick tube - the options are somewhat limited as to where it can mount. The angle of both the banjo and the damper both suggest directly from underneath. It should be obvious - why isn't it?

 

[Charles Morgan]

I have the answer. It may be the wrong answer, but I think not. I did some measuring and determined that the banjo union could not be much more than 6 inches away from the dipstick, and the dipstick had to sit right at the back of the engine bay.

So first I found a photo with the dipstick displayed.

My eye was then drawn to the hole at the manifold which is the draw for the internal vacuum lines (top middle left - just where the right side of the servo disappears). Looking at it from a distance there is definitely a union, and there is also a metal pipe, as well as the vacuum line.

So I remove the vacuum line and took out the nut - and lo,

and the banjo union fits very well. So this is where it goes! It's within the regulation distance of the dipstick too.

 

[grober]

Quite possible Charles. That would certainly work. Well done Its possible the earlier picture you posted of the German E bay box for sale might be from a carburetted car with a different manifold- hence the " adapter"

 

[Bellow]

FAD!
So it was here >>

all along!
Pretty cunning of them (I'll refrain from the expletive) to so disguise a banjo bolt. The b*******!

 

[Charles Morgan]

Yep - it's a spacer no doubt only found on manual models.

I spent most of the afternoon hunting for dipstick photos and that one caught the eye as just a little different from other photos.

 

[Charles Morgan]

So, I now think the vacuum control issue sorted, the box linkage is going to be somewhere at Colin's, I've found the location of a the kickdown switch, also found a switch online and need to pull all the loom together.

As to the gearbox piping, one pipe has the flexible hydraulic hose missing, but with the existing box hoses I think I can sort that. The kickdown solenoid clearly fits where Graeme suggested.

So autobox not fully solved in parts, but largely there in theory.

Next job, the Megasquirt.

 

[Bellow]

Yep - it's a spacer no doubt only found on manual models.

I spent most of the afternoon hunting for dipstick photos and that one caught the eye as just a little different from other photos.

You have keen eyes - I had to stare to spot the dipstick. Strangely though, in other pics (including one (280 version of same engine) where that bolt sits pointing rearwards) I kept noticing that pipe as being the only take off point in the plausible vicinity. But just assumed it fed only the central locking etc.

So, I now think the vacuum control issue sorted, the box linkage is going to be somewhere at Colin's, I've found the location of a the kickdown switch, also found a switch online and need to pull all the loom together.

As to the gearbox piping, one pipe has the flexible hydraulic hose missing, but with the existing box hoses I think I can sort that. The kickdown solenoid clearly fits where Graeme suggested.

So autobox not fully solved in parts, but largely there in theory.

All in the 'hooking-up'. Almost there now...

Next job, the Megasquirt.

Strangely enough...that's where I was this afternoon - having a look at what MS (and Emerald) have to offer.
Two versions of MS3 (sequential/non sequential) in two versions of configuration states it seems. Which version will you opt for (presumably calibration is via wide-band Lambda) and are they just boards (or within enclosures)?

 

[Charles Morgan]

Calibration is by wide band sensor, the version of ecu I need to research. In the SM the circuit board is contained within the cabin behind a metal plate. I shall have a look tomorrow.

 

[Bellow]

I was wrong. Earlier than MS3 are still available.

Welcome to Megasquirt UK

 

[tommyboy40]

Guys this is epic, a giant jigsaw. I wish I had more to contribute but am enjoying the read