Very technical MFI question....

[Jandrews]

Curiouser and curiouser! This is very interesting and it will be important to find out the truth. The amazing thing is that it appears we have many examples of both!


JA

[Roland911]

Same situation with my pump.
I have spoken to Koller&Schwemmer (Bosch) in Germany last weekend. This is the company who bought the whole equipement directly from Porsche and are the experts.
They confirmed that the pin hast to stick in the whole.

Roland

[Grady Clay]

Roland,

Thanks for inquiring – nothing like getting closer to the horses mouth (we tend to work from the other end sometime.)

A quick Google produced this link:
http://www.koller.de/

Go to “Kontact” and ask a question.

When I contact German companies, I send both English and a Google translation. Use simple sentences. That way it gets forwarded to someone who can actually answer the question.

Milt, the only reason I didn’t post here is I don’t have a pump apart. Sorry I didn’t make it to LA. Doc appointment change intervened.

Best,
Grady

[bavaria911]

Grady and Roland,

Herr Sattleburger is the man! He speaks English very well.
He rebuilt my S pump and adjusted the T pump ...which I plan to sell in the future.
Vr,
Bavaria911/ Scott

[Roland911]

Grady,

unfortunately the information you get from Koller is limited as they are cleaqrly "protecting" their knowledge.

But:

I got in contact with Porsche Classics in Stuttgart recently and these people are REALLY very helpful as they don't make a secret out of it.
They are responsible for the oldtimer maintenance and the car rebuild work at Porsche.
I met an elder mechanic who is VERY experienced.
He gave us a lot of hints.
Next meeting in May.

Scott,

in the meantime I bought a used MFI pump (from the US), I thought it would be a good idea to have it in order to replace parts if neccessary. In my case I think the flightweight mechanism isn't working properly. Too expensine to repair...

Hopefully I get the problems in the part load area now under control.

Roland

[Jim Richards]

I pulled the side cover off my injection pump today and found that the pin was not located in the hole of the lever arm.



Is it difficult to remedy this?

edit: After looking at john_cramer's post of the disassembly procedure and Warren's post of the pump internals, I think I should be able to correct this. I hope this will help my rich running condition that seemed to be a bit worse when we were at greater altitudes on our road trip.

[svandamme]

i've dealt with her Sattleberger for my S pump , found it best to translate things in german before mailing, and have him send back in german as well... wasn't getting anywhere with english mails...
and a typical german to boot, inquire about using 2.2S pistons for a 2.4 and how that would work with the pump and if they could calibrate for that, got back " nein we calibrate for ze exact 2.4S specification!"

and yes, they are very protective bout the knowledge...

[Jim Richards]

I've come to the conclusion that it is normal for the pin to rest above the lever, as seen in milt's, John Carmer's and my (2) MFI injection pumps. Here is a pic that Grady Clay posted a while back and it shows the pin resting above the lever (gotta look close).


(C) 1969 Dr. Ing. h.c. F. Porsche A. G., Christophorus #79, p. 9, February 1969


In addition, the pin diameter is roughly 0.14mm larger than the hole diameter (as measured on 2 injection pumps). After I replaced my inop barometric cell, I buttoned the pump up, leaving the pin/lever as they were.

[Roland911]

Strange.....I have never seen on pictures that the pin is outside the hole.
I have a contact at Porsche Classics.
I will try to get a final answer from one of their senior mechanics.

Roland

[jcge]

FWIW - in mercedes benz and RSR pumps, the barometric cell is located directly above this lever, and acts directly on it (right where the pin is shown resting on top of the lever in your many photos above) - in these applications, there is no need for the eccentric and pin to transfer the displacement to the correction lever

John

[isabuddy]

I am right now working on my MFI system and highly appreciate all the posts on this board. When I came acroos the pin "in" or on the lever question I took a look at mine (72 T) and it was resting on the lever. So I took a closer look and tried to understand the kinematic situation of this lever and here is my explanation why the pin should always rest on top of the lever:
The end of the lever which is actuated by the thermostat is guided in a linear slide (plunger type). If the pin was in the hole that would force a circular movement of the lever on the thermostat side. This would either destroy the plunger slide or prevent the thermostat mechanism from working properly. I thought that this is important to know for everybody so I put my first post after years of reading.

[Bobboloo]

This could be one of those situations where a design was altered from it's original blueprint but the hole still remains from that original blueprint. Possibly for the reasons you've outlined.

Thanks for adding your thoughts on this.

[Wayne 962]

I've always maintained that the pumps were way more complicated than the engines themselves!

-Wayne

[j911brick]

Thought I would bump this for the sake of possibly new information.