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  #1  
Old 09-18-2006, 05:36 PM
DeliveryValve's Avatar
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Oil in vacuum line

Hello all,

I was helping my friend with a 1980 300D change out the diaphram on the vacuum pod for the center vents when I discovered there is oil in the vacuum lines. He also stated that he had some oil ruin his shoes while driving. I suspect it came from the vent line that runs under the steering column. Do any of you know what can be the cause of this?

One more thing, the pod worked great with the mityvac but now we find that there is no vacuum in the lines to the pod when the car is running.. what else can be wrong?..?

Thanks

Richard

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  #2  
Old 09-18-2006, 05:38 PM
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Check the fuel shutoff diaphram on the rear if the Injection pump with your vacuum tester.
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  #3  
Old 09-18-2006, 05:41 PM
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Quote:
Originally Posted by bgkast View Post
Check the fuel shutoff diaphram on the rear if the Injection pump with your vacuum tester.
This is the usual culprit.
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  #4  
Old 09-18-2006, 11:17 PM
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Thanks for the info. Is the fuel shutoff the metal round thing at the end of the IP? If it is the problem, do you replace the whole shutoff?

Thanks again.
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  #5  
Old 09-18-2006, 11:39 PM
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The search function is a wonderful thing......

http://www.peachparts.com/shopforum/showthread.php?t=163498&highlight=shutoff


You are going to need to loosen the vac line at the brake booster and make sure there isn't oil down inside of it. If so, you need to suck it out with something......
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  #6  
Old 09-19-2006, 01:07 AM
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Booster: check only if you have been loosing brake fluid without any noticable drips. Buy a new 'o' ring first! Often you can leave the lines on the MC, unbolt the MC & slide/pull it forward enough to check if brake fluid is flooding the booster.
Do a search on diesel vacuum pump & you will find a few posts on bad pumps putting oil in the lines. I'd jerk the large black line & look for oil & verify the check valve condition.
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Old 09-19-2006, 10:10 AM
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You might have a read through dieselgiants shutoff valve repair.
http://dieselgiant.com/repairyourshutoffvalve.htm

If you aren't getting vac to the pods you have leak somewhere up stream of that. It may be as simple as a connector, or something a little more difficult like repairing/replacing the vac pump. You'll have to go through the system with the mity vac.
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  #8  
Old 09-19-2006, 11:43 AM
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Richard - I too vote for the notion that it's a leaking...

... a leaking IP shut-off diaphragm. Additionally I recommend that you also purchase a couple of in-line fuel filters and:
(1) Mount one in the engine compartment where it is readily visible... in the vacuum line that runs from the IP shut-off valve to through the firewall, and
(2) Mount the other under the dash on the intake of the vent line to prevent dust/dirt/crud from entering the vacuum system.

Sam
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  #9  
Old 09-19-2006, 11:58 AM
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Quote:
Originally Posted by Samuel M. Ross View Post
Additionally I recommend that you also purchase a couple of in-line fuel filters and:
(1) Mount one in the engine compartment where it is readily visible... in the vacuum line that runs from the IP shut-off valve to through the firewall, and
(2) Mount the other under the dash on the intake of the vent line to prevent dust/dirt/crud from entering the vacuum system.

Sam
Really.. What type of inline fuel filter works? Any generic one?
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  #10  
Old 09-20-2006, 12:06 AM
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cdplayer

My first MB was a 1980 300CD. I first noticed oil inside the airbreather canister. I had oil in several vac. pods and in the brake booster too. What a mess. Turns out for me the vacuum pump diaphram had ruptured.
The diaphram was an easy fix. Got several extras at the junk yard. Cleaning the pods, and the lines took some time. Hope this helps.
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  #11  
Old 09-20-2006, 12:23 AM
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Possibly coming from the speed head/cable connection??

We saw that on about an '81 I think,at the Indy MBZ shop I was service writing at for about 6 mos. Leaked right on to the customers shoe!!

Get up under there with a light and check it out.
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  #12  
Old 09-20-2006, 02:28 AM
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Cheap but clear filters that fit is what you want...

Quote:
Originally Posted by rmarzan View Post
Really.. What type of inline fuel filter works? Any generic one?
[A] In-line with IP shut-off - Any brand or type that is clear and has ends that you can fit the rubber connectors over so the filter is in-line and readily visible. The purpose of this one in the engine compartment on the IP shut-off is to: (1) slow down the oil from being sucked into and contaminating the ignition vacuum switch and dripping on your feet! And if the filter is clear you will be able to readily see when the filter becomes contaminated by the oil... early detection maybe!?

[B] On the VCV vent line - This one on the vent line under the dash is strictly to prevent dirt and other "stuff" from being sucked into the vacuum line, on to the VCV and the rest of the system that controls shifting and EGR actuation.

Sam Ross
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  #13  
Old 09-20-2006, 08:20 AM
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oil pressure gauge?

How about oil leaking from the oil pressure gauge everywhere behind the instrument panel, being ignored for too long, and getting sucked into the system at the (leaky) ignition switch vacuum lines? I think this is what happened on my car. I have oil in my climate control lines too, but my IP shutoff works and holds vacuum. My vacuum pump pulls a 20 or so. What a mess. I still have to find a way to get all that oil out of the lines.
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  #14  
Old 09-20-2006, 10:36 AM
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Quote:
Originally Posted by rocketman93116 View Post
Possibly coming from the speed head/cable connection??

We saw that on about an '81 I think,at the Indy MBZ shop I was service writing at for about 6 mos. Leaked right on to the customers shoe!!

Get up under there with a light and check it out.
Quote:
Originally Posted by threehunnertdee View Post
How about oil leaking from the oil pressure gauge everywhere behind the instrument panel, being ignored for too long, and getting sucked into the system at the (leaky) ignition switch vacuum lines? I think this is what happened on my car. I have oil in my climate control lines too, but my IP shutoff works and holds vacuum. My vacuum pump pulls a 20 or so. What a mess. I still have to find a way to get all that oil out of the lines.
We had the dash out to change the Diaphram of the vacuum pod, and the Speedometer Cable looks clean and the Oil Pressure Guage/lines looks to be sealed with no leaks. So I guess we'll have to check on the other suggestions posted here. Now if we find the problem... We are in the same boat... How the get all the oil out of the lines!.!
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  #15  
Old 09-20-2006, 10:55 AM
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Quote:
Originally Posted by rmarzan View Post
Now if we find the problem... We are in the same boat... How the get all the oil out of the lines!.!
Please read the links supplied above. Your answer was there all the time.

**edit**
Here you go:

http://www.peachparts.com/shopforum/showthread.php?t=126051&highlight=shutoff

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'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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