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#1
01-06-2005, 03:30 PM
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Turbo Vacuum Line
Helo Folks,
There's a single vacuum line hooked to what appears to be the Turbo's Housing. The other end is dangling in the open. Where is it supposed to be hooked to? And what's the purpose for this line? Thanks! Peter - 1984 300D 
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#2
01-06-2005, 07:31 PM
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Could you be a little more specific? Is it a cloth covered rubber line or a thin hard plastic line?
There is a pressure line that goes from the inlet to the turbo wastegate that spills boost pressure to prevent an overboost - it's a thick cloth covered tube. On some years there is also a vacuum line going to some sort of air recirculation device, but I don't think it's actually on the turbo itself, but it is close to it. Kevin
__________________
'85 300SD
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#3
01-07-2005, 01:06 AM
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Quote:
Absolutely and thanks for requesting clarification. Indeed it is a hard blue/white/red plastic line. I should have referred to it as a pressure line instead of vacuum. Since diesels do not produce vacuum. I ran out to the garage clicked a few diigi pics and attached one right here to illustrate my question. As you can see from this picture there's the blue/white line attached to the turbo's housing. The opposite end of this tube, not visible in pic, is not attached to anything. Nearby this blue/white tube is a somewhat brown/red tube not attached to anything from either ends. All and any comments would be appreciated from anyone who recognizes these two hard plastic tubes as to where they belong from both ends. Thanks, Peter - 1984 300D
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#4
01-07-2005, 08:00 AM
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Peter,
That is the air recirculating valve (also reffered to as the circulating air safety valve, depending on what vacuum diagram you're looking at). I had to disconnect mine due to leaking diaphragm causing a VERY annoying whistle. I just plugged the line with a BB. The vacuum line on my 85 300TD-T is routed across the engine bay to a switchover valve (I think mounted on the other fender. I'll check later on today and try to get a picture for you. Doug
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#5
01-07-2005, 11:04 PM
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Quote:
Likewise this blue lplastic line is routed across the engine but unhooked at the end. The only switch over valve I know of is the one by the brake booster for ALDA and manifold pressure sensor. However there's no sign that this valve supposed to be connected to this ARV. With Regards, Peter
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#6
01-07-2005, 11:18 PM
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Slightly off topic, but...
Dance'w'Diesels: I should have referred to it as a pressure line instead of vacuum. Since diesels do not produce vacuum. Correct, as in they don't produce manifold vacuum. Incorrect, or incomplete, in that M-B diesel engines have a vacuum pump. Most of the lines are, indeed, vacuum. A line connected to the manifold may be under slight pressure, up to 1.0 bar under full turbo boost. You knew that, of course...  Best Regards, Jim
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#7
01-09-2005, 02:57 AM
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Quote:
All good points! Whatever I may know is nothing compared to the mountain of unknowns I still have to learn
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#8
01-09-2005, 02:31 PM
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Here are the pics
Peter,
I apologize for my tardiness, but here are a few pics of where that vacuum line routes on my 85 300TD-T. There is a wide view and a close up of the switchover valve.
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#9
01-09-2005, 06:04 PM
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The red and white line probably goes to the EGR valve. Blue line is the air recirc.
Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#10
01-09-2005, 08:16 PM
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Quote:
Those are great pictures! It certainly fills in the missing link. So this tells me a few things. The PO was right his mechanic used different parts from other MBs during engine rebuild. I suspect those dangling lines were left so because on this version they serve no purpose on my early '84 300D.  Correct me if I am wrong but that big round white can in the foreground is the so called trap oxidizer? If this is true they were part of MB's emerging emission controls already implemented for the CA models. Hence those blue/white and red/whatever colored plastic tubes are probably used in conjunction with the trap oxidizer.So then unless anyone objects I shall remove these two lines then plug up the ARV. Also seal off the EGR with a solid sandwich gasket.
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#11
01-09-2005, 08:26 PM
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Quote:
Right, at least this is how I managed to interpret from available schematics. Right now my EGR is routed to a twin tubed sensor near the front valve cover. The other tube appears to route to the black valve control mechanism near the rear and top of the valve cover. I suppose this "black box" somehow routes vacuum to the EGR via this twin tubed sensor. For this reason the dangling red/white line isn't used and probably does not belong there...
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#12
01-10-2005, 10:27 AM
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Quote:
That is the hydraulic fluid resevior for the rear suspension. Its an '85 300TD-T (wagon) with federal emissions setup.Quote:
Here's what RWThomas had to say when I was trying to figure out what the ARV does. Quote:
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#14
01-10-2005, 10:06 PM
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Quote:
As usual thanks for your very informative input!  Well OK I mistakened the hydraulic reservoir for something else  What else did you expect from a newbie? But I was thrown off guard by the fact that the switch over valve was mounted on your fender as opposed to mine on the firewall by the booster...But I am learning a lot thanks to you and everyone else in this thread 
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#15
01-10-2005, 10:24 PM
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Please look at this thread...
I just posted an update with new pictures at this thread...
http://www.peachparts.com/shopforum/showthread.php?p=793708#post793708 Your input is much appreciated! With Regards, Peter
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