How to replace the (Injection Pump Timing device) Stroke Curve on a bad vacuum pump.
 

Hello Folks,

I have a 95 E300D W124 with 152k miles and a very bad vacuum pump.

Well pulled the pump and found a badly scared stroke curve. The
instructions say I can't purchase an individual part that I have to
install a complete injection adjusting device. Am I over my head here?

Thanks for any help!

David in Virginia

Are you speaking of the timing device that runs off the timing chain?

I believe you refer to the ramp on the timing device and its part of the timing device. Better find a parts engine, the OE part is a high ticket item. Your lucky the pump didn't disintegrate and take the engine out with it.

Yes, the entire timing device. Not at all a cheap part and it's a major engine repair.

reply
 

Yes, I'm talking about the ramp looking device powered by the timing
chain. Directions for the pump said you used to be able to purchase
the part but now it is not available anymore. Said you need to
purchase a complete injection adjusting device....what ever that
is? Anyone have experience with this?

Ploy no help but on the W123 the (2) down part of the "roller coaster track" on the timing device is vertical when you reinstall the pump.

complete injection adjusting device... Waz zat?

Can you grab us a picture? Mine is marked up a good bit too just from normal wear...

What about replacing with a after market ele vacuum pump?
 

Folks have you every heard of anyone replacing the mech. vacuum pump
with after market one used by the auto racing circuit? Cost is around
$329. and you get back some HP because it wouldn't be drawing on the
engine.

Heres a link of the pump I'm talking about.
http://store.summitracing.com/egnsearch.asp?N=700+115+314448&D=314448

Good Idea?:) Bad Idea?:mad:

Come on now, I don't think the HP difference would even be measurable on a dynamometer.
Besides the fact the aftermarket pump costs more than what a Pierburg sells for the only real reason I can think of to go this way is to increase reliability, which, if you are using a new style pump, should be very reliable. Its the old pumps that were crap and have destroyed more than a few engines.

If however you have a timing device (ramp) with a rough surface then installing an outboard pump is a way around a costly repair!

Just fix it properly with the correct parts.