Mercedes W114 250 Coupe - help!

[grober]

It may have been removed together with any associated wiring. There should also be a dipstick+ guide tube around there which can also function as a support for the vacuum line from the inlet manifold to the vacuum modulator. Bet they're in a "box of bits" somewhere.

 

[Charles Morgan]

Got the dipstick, that came from the box of bits the second time I went up, so he might still have it.

 

[Druk]

Clip from the 107 wiring dia.



Shows that the black/grey/red is also in parallel to the kickdown switch from the multi connector block the plug goes into. From the switch to the kickdown solenoid is green. Neg return from that is through the engine block.

45: kickdown solenoid
46: Kickdown switch.
47: Connector block.
48: Gearbox selector switch.

Also incontrovertible evidence of inability to spell correctly first time out




.


.

 

[Charles Morgan]

How difficult would it be fitting the auto from my W126 donor car - it has everything already there.

Thank you all very much for some great help. It is very much appreciated!

 

[Bellow]

How difficult would it be fitting the auto from my W126 donor car - it has everything already there.

Starter motor position?

There is clearly a fixing for it, but that has an old grommet in it, but no rectangular thing.

If the grommet is merely keeping dirt out while the box is out of commission...but to my understanding the KD solenoid will control an oil signal which is operating at significant pressure.

It may have been removed together with any associated wiring. There should also be a dipstick+ guide tube around there which can also function as a support for the vacuum line from the inlet manifold to the vacuum modulator. Bet they're in a "box of bits" somewhere.

Are you sure the box is vacuum controlled? My understanding was it was a purely mechanical system with the modulator being controlled via a rod connected to the throttle pedal - that and the KD switch giving an adequate representation of load. I will happily take correction on my view but if I'm correct then there's obviously little point searching for parts that won't be present.

 

[grober]

Starter motor position?



If the grommet is merely keeping dirt out while the box is out of commission...but to my understanding the KD solenoid will control an oil signal which is operating at significant pressure.



Are you sure the box is vacuum controlled? My understanding was it was a purely mechanical system with the modulator being controlled via a rod connected to the throttle pedal - that and the KD switch giving an adequate representation of load. I will happily take correction on my view but if I'm correct then there's obviously little point searching for parts that won't be present.

Can't disagree without the box in plain sight its almost impossible to say. You could be correct. I was going by this resto video if you look at the picture at 2mins 39 you can see what I take to be the vacuum line running to the vacuum modulator rear of the box. In this instance the solenoid is the small black box towards the front??? You do also see the mechanical arm to the main modulator you mentioned [YOUTUBE]n47fvv7BGYU[/YOUTUBE]


As far as the 4pin plug is concerned

This puzzled me at first also- it really depends on where exactly item 47 is located? If it was located at the gear box you would have to to run a wire from the gearbox to the kickdown switch and back again?? It make more sense if the connector block 47 is further back towards the bulkhead and that the 4pin plug pictured actually corresponds to 48 rather than 47. If there is evidence that either side of plug 47 has a second wire from pin 3 leading elsewhere in the sleeving then fine otherwise I think you have to go back further in the wiring to find the supply to the kickdown switch. Its slightly academic in a way thankfully as it should be relatively easy to rig up a new supply from fuse 8 to the kickdown switch and on to the solenoid if necessary.

 

[Druk]

Correct that the starter is wrong side.

#47 will be/should be inside the car somewhere, probably the footwell.

 

[Bellow]

Can't disagree without the box in plain sight its almost impossible to say. You could be correct. I was going by this resto video if you look at the picture at 2mins 39 you can see what I take to be the vacuum line running to the vacuum modulator rear of the box. In this instance the solenoid is the small black box towards the front??? You do also see the mechanical arm to the main modulator you mentioned [YOUTUBE]n47fvv7BGYU[/YOUTUBE]


.

Those lines appear to be steel and I suspect fluid lines. The one that terminates in a banjo at at its forward end appears not not connect to the box - fuel line?
Mercedes traditionally used flexible plastic (with an internal structure identical to the three-pointed-star in cross section!) for vacuum pipes and I suspect a vacuum system would employ a diaphragm large enough to generate the required force which would be too big (and vulnerable) to fit within the box. But no sign of an external one. Pretty certain my W123 was purely mechanical - or it would never have moved given every other vacuum system on it leaked profusely!

KD solenoid? I can't make sense of the lumps and bumps that adorn MB auto boxes in photos. Surely a solenoid should be cylindrical in shape with a wire emanating from its internals?

 

[Charles Morgan]

I take it 47 is the connector block into which my 4 pin plug from the box connects.

I am going to wheel the box out and take some detailed photos. This make take some time as I have a SORN W126 which needs to get out of the way so my SM can come out (I'd always had suspicions...).

 

[Druk]

^ yes, although bear in mind it's all supposition as the info comes from a 107. The wiring colours are likely to be correct as 'they' didn't tend to change much as time progressed.

 

[Charles Morgan]

Holes underneath

Oily bits front offside - hole without grommet visible and purpose of grommet to keep oil in.

Close up oily bits offside

knobbly bit rear offside

Grommit topside of bell housing

Oily bit front nearside with electrical connectors to rear

Details of electrical connector with gear control linkage to selector to rear

 

[grober]

If you look at that video at 54 seconds you see the vacuum line leading from the inlet manifold to the vacuum modulator pictured in the snap entitled
"knobbly bit rear offside " you can actually see the banjo union bolt.


the picture entitled

Oily bits front offside - hole without grommet visible and purpose of grommet to keep oil in.
shows where the solenoid screws in


Grommit topside of bell housing
is a breather pipe I believe

Holes underneath shows the inlet +outlet for hydraulic fluid leading to the radiator for cooling ??
see video at 0.59 secs

That video answers a lot of questions-- it's worth a view but you have to concentrate as the relevant piccies only come up for a second or two. I hope also that all this "deductions from afar" from videos pictures and EPC that I am posting are not too confusing in the light of suggestions made by other posters--- they are merely educated guesses I can't ultimately be certain of their veracity

 

[Charles Morgan]

I'm planning to get the remaining bits from the seller next week.

Today removed rear caliper and half the drop link. Needless to say the bit I couldn't remove is really rusted in to the ARB which of course provides a lousy platform for exerting torque, and the exhaust gets in the way too. Much soaking with Monolex going on. Tomorrow I'll start prepping the wheel arch for rustproof paint.

In cleaning the n/s window from the front door, I noted it is a lighter shade of green than the rest - Tony bought a replacement door, so I shall need to find a matching one somewhere. Memo to all restorers - it never stops.

 

[grober]

A few more useful AUTOBOX piccies- not quite the same box its a 722.118 but similar layout

Then there's this mammoth rebuild thread ----warning light reading only advised to avoid brain damage!!!
722.118 Automatic transmission rebuild (Monster DIY) - PeachParts Mercedes ShopForum
has a little detail on the solenoid
PeachParts Mercedes ShopForum - View Single Post - 722.118 Automatic transmission rebuild (Monster DIY)

pressure regulator

 

[Charles Morgan]

Fantastic Graeme - I'll send those photos to the box seller to jog his memory.

 

[Charles Morgan]

Good news, chap thinks he's found the solenoid.

Bad news his glass is not coloured, which means I have to source a front quarter window pane too as I'd bought one from him last time. Some in Germany where I shall probably be going next week to get the remaining bits.

 

[grober]

The throttle linkage lever and rod mechanism would also be handy, as it also appears to be missing?
the dipstick tube and dipstick - can't remember if you have that already?
and that metal vacuum tube with the banjo unions that runs to the manifold- that could in theory be fabricated from nylon vacuum tube described earlier by Bellow but the banjo connections might be useful.

Moving to the other side of the box ---- the auto selector lever+ gate assembly [ 1min 18,1min 20,1min 28 in the video ] - and associated linkage---- Have you got them? ?

 

[Charles Morgan]

Other side - I have the lever, gate and linkage.

I have dipstick but not tube. I don't have vacuum tube and the banjo unions.

Throttle linkage lever and rod mechanism ditto - there is one on ebay at present.

 

[grober]

Other side - I have the lever, gate and linkage.

I have dipstick but not tube. I don't have vacuum tube and the banjo unions.

Throttle linkage lever and rod mechanism ditto - there is one on ebay at present.

There may be detail differences between the throttle linkages on the carburettor and injection automatics but hopefully just at the final manifold/carb/throttle body stage . I'm not sure exactly where that autobox control lever "interfaces" with the throttle linkage?
might be pictured at 1min 08 in the video?? would be different possibly for a RHD car altho I could see them retaining that horizonal rod as a fulcrum for both RHD and LHD linkages ?

 

[Charles Morgan]

I posted that simply to show what one looks like - I'll add the linkages to the parts list from Norfolk as the donor car is a 250CE auto and the guy owns a 250CE auto too - so we can have a look. My throttle linkage is in need of some love as the springs have lost their springiness and the thing sticks open. Not the best of things for driving!