Can anyone point me to some info on how vacuum is supplied to the modulator on an M-pump equipped car? I recently snagged one from the local p/p and it does not have a VCV on it,like the MW-pumps do. None of the gear on top of the valve cover was present, BUT the trans DID have a modulator of course...

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-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)

I lost that link. Thanks for re-posting it!

I'll confess that I came to this thread late and didn't read quite all of it so this may have been addressed - but is so, I missed it.

Anyhow, I'm putting an '84 300SD drivetrain in an '82 S10 Chevy PU to be used as a Land Speed Racing vehicle. It will never see street duty and is trailered to the track. I posted a couple of threads in the "Diesel Performance" section if anyone's curious. I won't be using much of the vacuum system (no PB, no heat/air system, etc.) but I am retaining the MB transmission, the vacuum engine shutoff, and any other bits that you guys tell me are critical.

So -
- How do I plumb this monster?
- What vacuum readings should I see at the shutoff, transmission vacuum modulator, etc?
- Can I skip the pile of stuff on top of the valve cover or is that critical to transmission operation? (Sure would look better w/o that mess!)
- Any other input? I'm new to MB but a pretty experienced automotive professional (retired).

Thanks for whatever input you can provide.

Dan

I'm pretty sure, all you'll really need is to get vac supply to the vcv, properly, 13-15 in/hg....and have the vcv connected to the modulator thru an orifice restriction fitting.

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-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)

That will depend on the car. Can you specify?

The VCV of a MRSF pump has an input (vacuum supply) and an output (regulated vacuum). It also has a vent line on the side.

I dont understand, there doesn't appear to be anywhere to connect vac lines to the pump itself

I see the two bolt holes where a VCV would go, I guess thats how I would hook this up... this is an M pump isnt it?

Thanks for the diagram. That helps a lot!

Dan

That is a MW pump.

Any time Dan, I'm happy to help if I can. As far as the pump types, I guess I had to re-read on how to tell the difference.

without VCV

.

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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered

The stock transmission doesn't have a locking torque converter...you will always be seeing a loss between the engine and transmission. I'd recommended swapping in a different transmission if you're building a race car.

You can ditch the pile of stuff on the valve cover.

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

Dang. The vacuum diagrams only go to 1985 on his site

Thanks so much for the great info

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Carpe Diem!