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  #1  
Old 07-22-2009, 07:00 PM
1982 240D
 
Join Date: Sep 2005
Location: Winston and Salem, North Carolina
Posts: 32
Oil in Vac lines?

I've got a 1982 240D. It's got 206k miles on it.

I was having a problem with the engine not stopping once the key was removed, so I started hunting for a leak.

I put a vac tester on the main brake line, and got a reading of 22 Hg. I started tracing fittings and dashpots, and found that the fourway fitting for the door lock actuator was loose.

But, I also noticed a little bit of oil in the vac lines. Not much, but a little.

So, I'm wondering if I need to rebuild the vac pump. I believe I've got a piston style vac pump (single line coming out the top of the pump).

Any help/insight you could offer would be greatly appreciated.

Oh...assuming I do need to rebuild the pump, does anyone have a step by step tutorial on how to do it? I checked the DIY links, and all the photo tutorials no longer work.

Thanks in advance!

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  #2  
Old 07-22-2009, 08:49 PM
kmaysob's Avatar
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Location: mesa az
Posts: 1,673
you may have a failing shutoff valve. the rebuild for the pump is really easy
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Last edited by kmaysob; 07-22-2009 at 08:56 PM.
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  #3  
Old 07-22-2009, 08:50 PM
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Posts: 18,350
Check your shut off valve with a mity vac. The most common cause of oil in the vacuum lines is a bad diaphragm in the shut off valve. Since you have adequate vacuum, I see no need to rebuild the pump.
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Old 07-22-2009, 08:58 PM
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Quote:
Originally Posted by kerry View Post
Check your shut off valve with a mity vac. The most common cause of oil in the vacuum lines is a bad diaphragm in the shut off valve. Since you have adequate vacuum, I see no need to rebuild the pump.

kerry, you are absolutely right. ive been out of the mercedes diesel game so long i mixed it up. post edited
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Old 07-22-2009, 09:19 PM
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Location: Long Beach,CA
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If the Oil is coming out of the Shutoff Valve there should be Oil inside of the Tubing/Hose that plugs into the Shutoff Valve.
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  #6  
Old 07-23-2009, 08:18 AM
1982 240D
 
Join Date: Sep 2005
Location: Winston and Salem, North Carolina
Posts: 32
Thanks for the replies, folks. I am going to replace the shut off valve at the back of the IP, but wanted to know if I needed to rebuild the vac pump as well...

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