have I screwed up?

[Joe]

Yesterday was a bright beautiful day, so I decided to replace the sockets and balls (and two rods) on my throttle linkage of my 1965 Euro 230SL. The new balls measure .312 inch in diameter, and those in the linkage were .300 to .312. I decided to keep those .310 and higher, assuming two thousandths slop is not so bad.
The one on the pump was close to .300, so it was a candidate for replacement. Since it was pressed on, I had to remove the lever thing from the pump so as to be able to use the bench grinder on the ball. When I went to reinstall the lever thing, I found the shaft onto which it fits rotates, so there is not a fixed place to put the lever. At this point, I got out the BBB and found a description of making a degree wheel thing fit on this lever so it could be set up correctly. I should have marked the shaft and lever before I removed the lever, but did not.
Is there a way to determine where to set the lever on its shaft without this tool? If not, is this tool available? Any ideas on whether the typical shop is set up to make this adjustment?
Thanks,
Joe

[ja17]

Hello Joe,
This is a factory setting and should never be tampered with, as you know now. This lever positions a follower on a compound cam inside the injection pump. The degree wheels will not help since the geometry of the linkages have not change, only the internal position of the linkage on the cam in the pump has changed. Re-metering the pump would be the obvious and expensive solution. If the car ran good before, I would attempt a trial and error method. Try first installing the linkage arm in a position so that the car idles warm as it did before. Then test drive and move it as required. Do you remember my post on how to separate the linkages to diagnose a rich or lean mixture ? Do not change the factory set stop screw on the pump, or else you will need the degree wheels. Keep us informed. Good luck.

Joe Alexander
Blacklick, Ohio

[ja17]

Hello Joe,
Here is some more information on your problem; (click on the enlarge
button to inhance images)
Download Attachment: pump linkage arm ill.JPG
54.63 KB

Download Attachment: Internal pump ill.JPG
66.36 KB
Joe Alexander
Blacklick, Ohio

[Joe]

Well, Joe, you read my mind! I was wondering just what is going on inside the injection pump when the accelerator is pressed. Just what is happening when the lever is mounted to the shaft in a different place? Does this alter the time the fuel is sent to each cylinder?
Do you think it would be possible to set this back up using the exhaust analyzer, viz., setting the axle to the shaft so as to have the CO in spec at the tailpipe at idle?
I'm not sure how I would turn the axle with the lever on. Not much room to grab ahold of it.
If I were to have this recalibrated, who does that, and what do I have to send?
This looks like an opportunity to learn even more about how this car works!
Appreciate the advice, for sure.
Joe
1965 Euro 4-speed

[Benz Dr.]

GOOD GOD DON'T DO IT. DON'T START YOUR CAR WITH THAT THING IN A DIFFERENT POSITION !!!!!!!!

  Last time I had a customer do what you did it bent something inside of the pump. Sorry, but you will need to send it to a Bosch rebuild centre for calibration. This shouldn't be all that much really if everything was working OK before this happened.

Dan c

Daniel G Caron

[Joe]

I'm glad you posted this before I started the engine, Dan.
Can you get this thing sorted out if I mail the IP to you? What is the turnaround time?
Thanks,
Joe

[Benz Dr.]

Maybe a week or less from the time I receive it. It's a couple hours of set up and calibration time and as long as everything is working well it's pretty straight forward.
My guys don't use the graduated cylinders any more and use a very exspensive machine that's used on Diesel pumps. This is a lot faster and far more acurate. They made up almost all of the special tools they need but still need the equipment that is owned by Bosch to do the whole job.
Make sure you drain ALL of the oil out of the pump before you ship to anyone. Shippers get very upset about that otherwise. I'd send the injectors and CSV for cleaning if they haven't been done in a long time.

regards,
Dan c

Daniel G Caron