Yes, big leak, small leak, as you mentioned.
Once you know which vacuum line is bad, it shouldn't too hard to find
the leak. especially with the vacuum tools people have mentioned. Notice
the color of the tube and follow it back. The door lock vacuum tubes are
all accessible from under the driver's carpet (maybe the trunk and fuel
door too). Also, when the car is running, what vacuum system is working
or not? (locks, a/c, brakes, engine shut off) What I've noticed, is that
the door locks seem to leak more often in the unlocked position. Is
there one that acts differently then the others? Does the engine shutoff
work only when the locks are down (or up)? There's a vacuum diaphragms
at the fuel door, as well as the trunk. The A/C should be easy to test
too, as the vents either open or close, when vacuum is applied by the
A/C controls, which you can tell when the car is running, and the fan is
on. The most common leaks seem to be the A/C pods, door locks
diaphragms, the fuel door diaphragm, and for some, the vacuum tube
connectors. If you need to replace a diaphragm, replace all in that
system, as the other one's are just waiting to go also, or with the door
locks, just have them (3 total) handy to replace as needed. My A/C
vacuum system is leaking vacuum, though it's such a PITA to get in
there, that my system has been isolated by a 1 way valve, so it won't
affect the other systems. Check the easy things first...
LA Nate should have more info on that year's A/C, as he fought with his
for awhile.
Rob
'85 300D
Garden Grove, CA
On 7/13/11 1:06 AM, diesel_mercedes@yahoogroups.com wrote:
> Newbie vacuum question # 1
> Posted by: "rkitt2002"rkitt@netscape.com rkitt2002
> Date: Tue Jul 12, 2011 9:29 am ((PDT))
>
> Hello All
>
> I am trying to track down the vacuum leaks in my new 1978 300D.
>
> I am assuming that if I pump vacuum into a line and it immediately looses the vacuum it is not supposed to work that way, there is a big leak.
>
> I am also assuming that if it slowly looses the vacuum there is a smaller leak.
>
> Please let me know if I am right.
>
> thank you
> Rodger
> Placitas, New Mexico
>
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