Mercedes W114 250 Coupe - help!

[grober]

I think it has to be taken from a blend of all six. Needless to say advice will be sought!

Oxygen Sensor Installation Issues (Tech Edge)

http://wbo2.com/lsu/LsuInstal.pdf

 

[grober]

Thinking back ??--- LHD I know

 

[Charles Morgan]

Superstar! Different duovalve so later car but the engine configuration is the same left or right handed. I think my pipe looks different though.

 

[Charles Morgan]

A trip to Bicester revealed the part above in all its glory, but for the bracket being the other side of the pipe, which didn't half confuse. However, we can now sort it all out.

The lambda installation guides were immensely helpful - the minimum distance from the closest exhaust valve of 1 metre takes the installation point well beyond the manifold and onto the downpipe. As was predicted by Bellow the thought of tapping this was not taken lightly, however JohnW said there were commercially available Lambda bungs so he'd look to weld one in.

Tomorrow is loom understanding time.

 

[Bellow]

Tomorrow is looming?

 

[Charles Morgan]

Back of the net Mr B!

 

[zet]

Whats the price for w114 in UK ? The real price ?

 

[grober]

TRY CLASSIC CAR ADVERTS for an answer? Price is heavily dependant on condition--- restored/unrestored---- engine converted to run modern fuels etc etc Due to a combination of UK weather/ salt road treatment/ a lack of basic body rust protection-- the vast majority of UK cars will require extensive and expensive body repair. If this has been done then the car is worth considerably more. The UK market is also restricted by being RHD meaning many imports have the steering on the wrong side of the car. Former colonies South Africa and Australia were useful sources of RHD cars with bodies undamaged by salt. Prices range from £3,500 to £15,000 ish depending on condition. They have yet to achieve the market status and astronomical prices of the W1O8/111 COUPES or W113 PAGODA SPORTS CARS for example.

Classic Cars For Sale on www.CarAndClassic.co.uk. Free Advertising for Classic Car Traders. Vintage/Old/Used Cars.

 

[Charles Morgan]

Meanwhile a lot of small but time consuming jobs have been done. The mounting for the CPS has been fabricated, and rock solid it is too. The position is easily accessible under the car so replacement should be easy.

The trigger wheel visible on the flywheel, now in situ

CPS bracket from the engine side

CPS looking through from the flywheel side. The bracket is adjustable back and fore, up and down and side to side.

 

[Bellow]

A question. 'Chased' I think, was the expression used earlier to describe mounting the trigger wheel to the fly'. What is 'chased'?

Looking at the photograph I can see what appears to be machining of the flywheel to accept the trigger wheel but not the method of securing it.

The CPS mounting looks perfect. Robust and adjustable - perfect.

 

[grober]

That and the wiring to the EDIS coil packs needs more work from me as I am entirely unclear how they all fit together, but the ECU is firing the EDIS directly rather than via the Ford controller.

This is a refresher-----
Mercedes-Benz Forum - View Single Post - 280SL "K-Jet and Ignition conversion to Megasquirt" write up

Ford edis coil pack diagram [ wasted spark]

the same twinned coil layout as the M104 6 wasted spark shown here with a straight 6 firing order of 153624 -same as the M114.

Some useful discussions on this thread but doesn't use the same hardware unfortunately.
Brown Benz (M104-Megasquirt)


If you don't intend to use a ford EDIS controller to drive the EDIS coil pack [ This would only require 2 wires from the Megasquirt unit ] then you will have to rig up a 3 power transistor/heatsink switching unit to fire the edis coils. wired as seen below[ taken from the first link]

 

[Charles Morgan]

A question. 'Chased' I think, was the expression used earlier to describe mounting the trigger wheel to the fly'. What is 'chased'?



Looking at the photograph I can see what appears to be machining of the flywheel to accept the trigger wheel but not the method of securing it.

The CPS mounting looks perfect. Robust and adjustable - perfect.

Chase in this instance being a term my builders used for putting a channel into plaster for wiring - in the case of the flywheel, recessing the trigger wheel onto a completely flat surface which was cut into the metal of the flywheel. It's secured by bolts - one is just visible on top right of that photo. A better photo attached.

 

[Mike Walker]

I got that bit right! First time for everything!

 

[grober]

Here are the wiring diagrams for the BIP373 ignition switching transistors. Board take off points and transistor wiring.
Megasquirt (V2.2 board) - Spark/ignition output

https://www.diyautotune.com/support/tech/other/bosch-bip373-ignition/

http://maya-auto.com/wp-content/uploads/bip373_datasheet.pdf

 

[st13phil]

Chase in this instance being a term my builders used for putting a channel into plaster for wiring - in the case of the flywheel, recessing the trigger wheel onto a completely flat surface which was cut into the metal of the flywheel. It's secured by bolts - one is just visible on top right of that photo. A better photo attached.

Just a word of advice: It's difficult to get socket countersunk screws tight enough to guarantee that they won't loosen in an application like holding the trigger ring onto the flywheel, and the consequences of them coming out could be expensive.

It may be that they were installed with thread lock on them, but better still would be to stake them in by using a centre punch near to the edge.

Ignore me if they're nyloc screws...

 

[Charles Morgan]

We'll have a shufty on Monday when I'm next up. Gearbox was supposed to go in today, helpfully!

 

[Bellow]

The bolt heads should be accessible via the CPS mounting point if needs be - and the sump isn't in the way. I agree with st13phil's point - I don't trust countersunks not to shuffle when more than one is used and they can't find their own 'centre'.

 

[Charles Morgan]

It is - John said precisely that yesterday, which your prompt has just reminded me.

 

[Bellow]

Re shuffling - if the trigger wheel and flywheel were drilled together (guaranteeing the centralisation of the screws) and hard to imagine it wasn't done thus - then the bolts shouldn't shuffle. Hard to imagine they didn't Loctite them also.

 

[Charles Morgan]

On the principle that it's always the modified bit that fails first, I'll do a belt and braces on the trigger wheel bolts. The effect on the bell housing of a failure would probably be a bit damaging, all the rest I have spares for!