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1980 Mercedes 300D vacuum routing diagram

  #1  
Old 08-29-2014, 09:51 PM
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Default 1980 Mercedes 300D vacuum routing diagram

Could someone please post a routing diagram? On Vacuum control valve there are several ports. Are they all vacuum ports and interchangeable? Thanks. Ray
 
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Old 08-30-2014, 12:18 PM
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Thanks for the diagram. It shows that vacuum line goes directly to transmission modulator valve. How does vacuum control valve on top of injector pump affect shifting? From the diagram it seems it is not in the loop. Thanks. Ray
 
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Old 08-31-2014, 09:54 AM
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So the way I understand it, the vacuum control valve is a bleed valve mechanically linked to throttle. At idle the VCV is closed and vacuum is the same as the break boost line. As you push on gas pedal, the VCV starts leaking vacuum and at full throttle vacuum is zero. This is to mimic a gas engine at idle and under load. If all this is true why would we need the white 3-way valve on top of the valve cover? If there is no EGR, can I disconnect and throw away the white 3-way valve on top of the valve cover?
 
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