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Old 03-03-2007, 07:37 AM   #1 (permalink)
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Date registered: Sep 2004
Vehicle: 1985 500SEC, 1991 190E 2.6 (50k original miles)
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Missing: Part # 29 in vacuum diagrams?

We have a bit of a stumbler.
On the CD,s, all vacuum diagram, 19 81 - 86, show on the top part # 29, a check valve (injected air).
The former owner of my car had plugged a number of vac. lines that we restored.
But there is no # 29 valve on my car.
I posted in 'good news for me', but haven't heard back from anyone.
This valve is shown to be on the back (to fire wall) of the engine, next to the linkage.
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Old 03-03-2007, 08:02 AM   #2 (permalink)
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do you need the part # if I find it?
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Old 03-03-2007, 08:07 AM   #3 (permalink)
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Yes, that would be great.
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Old 03-03-2007, 08:08 AM   #4 (permalink)
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Check valve

On my 84 500 SEC euro that check valve is threaded into the block at the right side towards the front, with a hose running from it to the air pump.
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Old 03-03-2007, 08:26 AM   #5 (permalink)
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Just a second, I got to get to it!
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Old 03-03-2007, 08:39 AM   #6 (permalink)
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The good news is you don't have to mow the lawn today!
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Old 03-03-2007, 08:50 AM   #7 (permalink)
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Dave D, you say the valve is on the right side of the intake, towards the firewall? From the diagram, it looks like it's on the timing housing cover.
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Old 03-03-2007, 09:32 AM   #8 (permalink)
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You are right. Found it up front, next to the oil filter. Hasn't been used in a while.
Thanks to all.
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Old 03-03-2007, 09:49 AM   #9 (permalink)
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I'm so glad I didn't start digging...
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