1995 e300di vacuum lines - PeachParts Mercedes-Benz Forum

Djsantanvalleyaz · #1 06-11-2015, 10:05 AM

We are preparing to remove the center intake section to replace vacuum lines. 3.0 non turbo.

We ordered 2 o ring seals for the bottom. Do we need the top 1 or 2 o ring seals or any other parts to complete the job?

Seems no other way to access vacuum lines.

Dj

Maxbumpo · #2 06-11-2015, 10:08 AM

The seal rings in the intake tubes / manifold / cross-ever pipe are able to be used over and over again. I simply clean them and then lubricate them with some automatic transmission fluid when putting it all back together.

Djsantanvalleyaz · #3 06-11-2015, 10:51 AM

Nice to know. Have you incurred vacuum issues? We are using the Mercedes schematic to check on proper routing.

Previous owner we believe did not route correctly.

Any way to check lines without removing center intake piece?

Dj

Maxbumpo · #4 06-11-2015, 10:55 AM

I haven't had that particular issue, lots of other mess from previous "mechanics" to fix though.

You may not be able to get to all the vacuum lines without pulling the intake manifold. Note that the manifold to head gasket can also be re-used, just clean it up and clean off the metal head and intake surfaces. Be warned that the PCV tubes / piping is plastic and rubber and it all gets old and brittle with age, and THAT may disintegrate when you remove it and require an order from the dealership. If you just remove the cross-over pipe, you may not need to remove the rest of the intake manifold.

Djsantanvalleyaz · #5 06-11-2015, 11:16 AM

Understood. So only the dealership and no other vendor on that part? Any idea on part number? Hoping to resolve occasional rough shifting.

DJ

Zulfiqar · #6 06-11-2015, 11:24 AM

The vacuum lines under the manifold are not much, a VCV (for transmission) and a shut off along with two for the manifold flaps. There is also a T line going to the EGR on the passenger side of the car.

The whole nest of vacuum lines routes near the brake booster, and go into the interior, the green line is for the climate control pods, the white is for the rear headrests, there would also be a red one looping back down and disappearing under the wiper cowling.

This line goes to a vacuum chamber hidden in the right fender wing, It acts as a reserve when vacuum demand is high.

any leak in the lines (except the brown ones) will cause harsh shift and also loss of AC airflow direction control.

Djsantanvalleyaz · #7 06-11-2015, 11:36 AM

Ok. My center dash vents are not operational. Defrost and side yes.

So we have some plumbing to check out.

Your assistance is greatly appreciated.

DJ

Zulfiqar · #8 06-11-2015, 03:13 PM

you have a vacuum leak somewhere, all pods in the dashboard are directed with vacuum from the green line going into the interior - its behind the brake vacuum assist servo. You can test individual systems from directing vacuum from the extra and capped vacuum port in the large brake vacuum line.

Jeremy5848 · #9 06-12-2015, 01:49 AM

Center dash vent failure to operate is probably a bad pod; replacement requires pulling the dash, a time-consuming procedure. Other causes of failure are failure of vacuum to the entire climate control system (less likely since you say defrost and side vents work) and failure of vacuum to just the center vent pod. The latter could simply be a line popped off the manifold (behind/left of passenger airbag).

Jeremy