Quote:
Originally Posted by floydla1
Hi folks,
The MB I have: '83 300SD 142K Mi Chassis W126 Engine: 617.95 Tranny: 722.3.
I have performed a full system leak test -- it holds vacuum well, about 0.2" Hg loss in ten minutes. The flaring at 2-3, which is not too bad, is occurring at ~5" Hg when acceleration is gradual. If I push the acceleration such that vacuum is less than 2" Hg, no flaring. It appears I am missing the first orifice (#62 on the vacuum line schematic) -- does anybody know what orifice size this is suppose to be?
Now, if I have plugged off the EGR valve, do the 3-2 valves now have a purpose? Looking at the vacuum diagram, I should by-pass them as well and avoid a potential source of leaks. No?
FYI, according to my MB dealership, the following orifices are no longer available in North America:
Red, 1.1 mm, PN 1162761029
Brown, 0.9mm PN 1162761429
White, 0.8mm PN 1162761229
This is my first exposure to the diesel engine -- loving it!
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Your orifice is in place and functioning properly. You can't find it because it's just a small round sliver of plastic between two rubber vacuum lines. If any dirt has accumulated, it's effectively invisible.
The first thing to do is to remove the 3-2 valves from that system. They only serve to run the EGR. Here is how to eliminate them:
http://www.peachparts.com/shopforum/showpost.php?p=1375506&postcount=5
After you remove the 3-2 valves, get a reading on the vacuum levels at idle and as you drive it. It's possible the flaring will increase. If so, report back and I'll show you what to do with it.