Mercedes W114 250 Coupe - help!

[Charles Morgan]

Next how to deal with the idle air intake valve. But not with it now!

 

[Charles Morgan]

I've been doing lots of little jobs and pondering the IACV control valve mounting a lot more.

One little job is cleaning up the fusebox area and dealing with the effects of 45 years of dirt and zinc corrosion. New OEM relays are unfeasibly expensive so I am trying to avoid buying them for aesthetic reasons, so thought I'd clean them all up. The logo on the side in red is very faded and I thought if I sprayed the relay casing with zinc paint I'd lose it. So I did a photo using my finest macro lens, boosting the original colour with oil, then photoshopped some more detail and colour in. Then I printed it onto a clear plastic label, painted the relay and stuck it on the repainted relay. Result very pleasing and much cheaper than a new relay!

 

[Charles Morgan]

Idle Air control Valve ("IACV")position is the current headache, but I think I am getting there, inspired by a discovery when last up at CCPS.

The current idle control is entirely mechanical - the first photo below shows the line from air intake housing to manifold (bottom left to about 35% up right side).

The problem is the weight of the IACV. It weighs just under a pound, and would need a mounting (plus a wider hose). My BMW M535i has a bracket for it and my SM has it mounted on some seriously thick hose, with half the span of hose than on the 114. Second photo shows the difference in hose size.

Anyway back to the first photo - mid-way up on the left side you'll notice the cold start injector on the side of the manifold. This is now redundant with MS (and I have a back up). Removing the injector itself reveals a nice possible mount for a hose to the air inlet - drill a wide hole, weld in a pipe through it to the outside, then do the same on the underside of the air intake and mount the IACV where the MAP sensor (an equally lumpy and hefty thing) sits on the inner wing. Guaranteed to cause bafflement and searches in the marking boxes of a concours judging sheet of the men in white short sleeved polyester shirts perhaps?

(apologies for photos, photobucket is being so slow I've give up today).

 

[Bellow]

What restrains the cold-start injector? Can it not be tweaked to accept the hose without having to weld the manifold?

 

[Charles Morgan]

The injector mount on to the manifold is what I'd weld, but removing the injector from its housing entirely would leave a nice pipe width in, so thanks for the improvement!

 

[grober]

Not sure what you mean by IACV? This is not what is also termed a warm up valve where its thermally controlled by heat from the block??
see
Fast idle device, 280 SE 1974

 

[Charles Morgan]

No - the Idle Air Control Valve is a device that opens as required to let air into the manifold while the engine is at idle, bypassing the closed throttle butterfly. The stepper motor inside is controlled by the ECU to maintain a steady idle, opening and closing as required. The existing mechanical set up will go as it is entirely redundant.

 

[grober]

Right you are using a more up-to-date electrical idle air control valve---- didn't twig that.

 

[Charles Morgan]

Lots of progress but little time to report. Photos to help in the meantime.

 

[Bellow]

Bolted not brazed?

Those relays - cunning!
Firewall insulation looks good - as does all the progress. You're getting there.

 

[Mike Walker]

Looks bl**dy fantastic to me!

 

[Charles Morgan]

Bolted not brazed?



Those relays - cunning!
Firewall insulation looks good - as does all the progress. You're getting there.

The machine shop decided that the face of the flywheel was not flat enough so they chased in the trigger wheel. Bolts ensured it was balanced, which it has turned out to be, perfectly. It's a very nice piece of work.

I'm really pleased, the chap now working on it is intelligent, knowledgeable about old and new car systems and is not prepared to cut corners. He has been really helpful on planning the MS conversion too, and when I explain something he grasps it instantly, which is reassuring to me that I'm not spouting total nonsense, and invariably he has a better plan.

 

[Charles Morgan]

In case anyone was wondering the cam cover pictured is not going to be the one going on finally, it's simply protecting the gubbins underneath. I am hand-polishing one to crown it all off.

 

[grober]

Thought you might like this Charles if you hadn't noticed before?

250 C/CE 10-1968 (D)

taken from this guys excellent site
Engels

he posted a link here originally
http://www.mbclub.co.uk/forums/general-discussion/194214-brochures.html

 

[Charles Morgan]

Thanks Graeme - a lovely period resource!

 

[Charles Morgan]

All my Megasquirt bits and pieces (ECU and other bits) have now been ordered from Phil at ExtraEFI. He has been exceptionally helpful, and his website has a huge number of useful how to videos.

 

[Charles Morgan]

A nice pair of pressed black and silver aluminium plates also ordered.

 

[Charles Morgan]

I spent most of the day helping with the restoration work up at Bicester as identifying and fitting a lot of hoses etc required my knowledge.

Duovalve (beautifully polished by Iwan, the new apprentice) and heater pipes all in.

John fitting the manifold gasket (one stud was slightly out of true so this was a bit tough)

Next the exhaust manifold - very tight, so we had to remove the bolt holding the o/s engine mount and pull the engine over to the n/s enough to create some space.

In

 

[Charles Morgan]

Doesn't look like the original ignition amplifier, I wonder what this is?

Radiator and oil cooler all in:

What brake cleaner pulled out of the inlet manifold

Inlet manifold completes the day's exciting activities.

 

[brucemillar]

Looking fantastic Charles. Great work.

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