It was message number 53626, titled "Super-Leaky SD - Solved?", October 18, 2010.
Only rebuild the diaphram pump if that's the set-up you have. To convert a piston-style-equipped engine to the diaphram-type pump requires more than mere bolt-across. It's all in the "Super-Leaky..." post.... Except for the part where I found the rebuild kits for the diaphram pumps (at autohausaz.com, for instance, you hafta to look it up as a rebuild kit for an earlier car, say, '74 240D. All the look ups for the '79s bring up the piston-type pump).
Now that I know this, I'm probably going to convert mine back to the original diaphram pump.
Mark in Lakewood, CO
> To: diesel_mercedes@yahoogroups.com
> From: bgiovan@cavtel.net
> Date: Mon, 7 Feb 2011 10:26:24 -0500
> Subject: Re: [diesel_mercedes] Re: Vacuum pump 101
>
> Sorry Mark - wasn't thinking about it in October! I'll do an archive
> search. I was just surprised I guess that within the span of a
> half-year these cars had two different vacuum pumps. So rebuild the
> double diaphragm is the consensus?
>
> Ben near Detroit.
>
> On 2/7/2011 10:24 AM, Mark in Lakewood CO wrote:
> >
> > Nah, the one on the right is the double-diaphram style, used on the
> > earlier (and so, generally, non-turboed) diesels, AND was the original
> > unit on my '79 SD. The one on the left is the piston type that is now
> > pretty common in the yards around here, because there simply AREN'T
> > any pre-80 cars in the yards right now. The nice thing about the
> > earlier unit is that it's still rebuildable for relatively cheap ($25
> > for two diaphram kits), whereas the kits for the piston type are over
> > $100 and were not available last time I checked (in October).
> >
> > It was in October that I submitted a rather comprehensive (and,
> > admittedly, lengthy) post on my findings on these pumps. 'Guess
> > nobody read it.... (Insert pity party here.)
> >
> > Mark in Lakewood, CO
> >
> > ------------------------------------------------------------------------
> > To: diesel_mercedes@yahoogroups.com
> > From: vwnate1@yahoo.com
> > Date: Mon, 7 Feb 2011 04:52:19 +0000
> > Subject: [diesel_mercedes] Re: Vacuum pump 101
> >
> >
> > Good question ! .
> >
> > Maybe one is a NA and t'other is from a turbo equipped engine ? .
> >
> > -Nate
> > Ben wrote:
> > >
> > > Both cars built in 1979 but two totally different vacuump pumps. Why
> > for?
> > >
> > > https://picasaweb.google.com/116318077355015592300/OM617VacuumPumps#
> > >
> > > Ben near Detroit.
> > >
> >
> >
> >
>
>
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