This group provides a forum for owners and operators of diesel powered motorhomes and 5th wheel tractors to discuss mechanical issues, regulatory issues (US, Canada), ownership, insurance, campground accommodations, trip reports/suggestions, and other topics relevant to large RVs and the people who drive them.
From Mercedes Source .
I can hardly wait as there's little air flow through the interior with no HVAC fan .
-Nate
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That's great ! you're InLine 6 cylinder engine also makes far more power than does my old Tech OM617 .
-Nate
Joe wrote :
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>
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> Just an FYI. My 1991 300D 2.5 (286K) and I just made a 650+ mile round trip to Philly area. 90% highway. No A/C, but heater on auto as it's winter here. Drove with "the flow" - though saw most of it in rear view mirror ;-)
>
> 33.36 MPG down, 33.23 MPG home.
>
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First thing :
*CAREFULLY * remove the long vacuum pipe between the engine and brake booster , most models have a metal support you *MUST* undo else you'll break it when it flexes .
Then , remove the brass conector that attaches the pipe to the vacuum pump being _SURE_ to use only a 6 point socket (either 17 or 19 MM , I forget right now) , wipe all the oil & dirt off it and try to blow through it both ways ~ my bet is : it'll blow both ways and it shouldn't do this as it's a one way check valve , often the disc either has a groove worn in it so it leaks or the disc crumbles and falls inside the pump further complicating things ~ if the valve is wide open & blows both ways , start the engine and let it run a while , have a nice hot cuppa while you watch the open pump like a hungry hawk watches a mouse , rev. the engine occasionally , in due time you'll see tiny bits of crud (the disc remenants) come flying out of the open pump , stop the engine and replace the check valve with a new (or used) one and marvel at how it now reaches 20" of vacuum 30 seconds or less after you start the engine .
Don't stop the engine as soon as you see the first bit of crud come flying out , Tom's car had multiple bits of dead valve disc in it that kept cloggng the new valve we put in , frustating as it'd check out fine but loose vacuum as he was driving , this caused hard brakes and greatly increased pedal effort....
Be VERY careful to not allow any dirt or crud to fall inside the pump as you're working on it ~ this is why I always try to keep my engine clean , it facilitats repairs .
Like most mechanical repairs , first thing is proper diagnosis then you have to address the various bits in the proper order to achive satisfactory results ~ as soon as you have good vacuum , the rest will follow faster & easier / better than you think .
-Nate
David wrote :
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> Hi Nate,
>
> I'll take another look. Nasty weather here in central NJ for the next few days. Don't know when I'll get back to the car. Drove it around the neighborhood a bit yesterday. Vacuum pump is coming off for a rebuild this weekend, though. Vac gauge was mostly wobbly and only a few inches. Probably just enough for it to shut off. Brake boost also very weak. At least I can work on the pump in the basement. I ordered their catalog. Lots of good stuff on their website.
>
> thanks,
> David
>
>
>
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Of the front of the engine.....
Just use your ignition key , my 84/85 TD's tailgate only unlocks by vacuum if the engine is running so it's a two handed affair to open it after it sits a couple days .
You have to hold the key turned as far as it'll go whilst you press in the button and lift the tailgate .
-Nate
Boyd wrote :
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> Any of you guys know where the vac pump is for the 85 300TD? My tail gate will not unlock with the rest of the locks, but it will lock. I am too old to be crawling back to unlock that door with the rear head rests on.  Â
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>
> Boyd
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>
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Hi Nate,
I'll take another look. Nasty weather here in central NJ for the next few days. Don't know when I'll get back to the car. Drove it around the neighborhood a bit yesterday. Vacuum pump is coming off for a rebuild this weekend, though. Vac gauge was mostly wobbly and only a few inches. Probably just enough for it to shut off. Brake boost also very weak. At least I can work on the pump in the basement. I ordered their catalog. Lots of good stuff on their website.
thanks,
David
--- In diesel_mercedes@yahoogroups.com, "Nate" wrote:
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> Don't feel too bad David ;
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> I went through this same hell with my '78 & '80 300CD , my current '84 300CD has a _gasoline_ hose map on it thanx to Frantz having a bit of a hangover the dsay they built my car..... =8-^ .
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> Didja look though _ALL_the home page files, photos and links yet ? there's a lot of different things in there so it takes time , lotsa time .
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> I wish I had a scanner as I have thier Fall/Summer Catalog # 59M and parge # `65 has the correct diagrams....
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> I'm sure if you take the time to peruse thier OnLine Catalog they'll have it there , or you can request a paper catalog from them .
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> -Nate
> David wrote :
> >
> > thanks, looked there already, they didn't have the one I needed.
> >
> >
> > Alan wrote :
> > >
> > > Look at Ecklers,AKA Performance Products catalog or online. They have
> > > layouts of the vacuum lines.
> > >
> > > On Thu, Jan 17, 2013 at 12:27 PM, David Starbuck wrote:
> > >
> > > > **
> > > >
> > > >
> > > > Hi,
> > > >
> > > > Anyone out there with a 79 300D who could take some pictures of the vacuum
> > > > hose connections near the oil filter and valve cover? I have 3 hoses that
> > > > were plugged off and need to find out where they are supposed to go. I
> > > > think one or more might need to go to something on the valve cover but
> > > > nothing up there. A diagram for a 79 would be good, also. I find a lot of
> > > > diagrams for newer models, but they all have an EGR and mine doesn't.
> > > >
> > > > thanks,
> > > > David
> > > >
> > > >
> > > >
> > >
> >
>
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I was working on it yesterday. No flex pipe on mine.
-David
--- In diesel_mercedes@yahoogroups.com, "Steve Parolin" wrote:
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> Its an 84, but not a US model.
> No Turbo, antenna on the front fender, no sun roof. Most of the time when I am looking for parts I tell the guy behind the counter its an 80. The guys a the stealership are confused by my VIN #, non US compliant.
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> The down pipe is for an 80, it matched with I pulled off, no flex coupling on it. 1 piece, solid.
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> Does your pipe from the manafold to the resonator pipe have the flex peice on it ?
>
> Thanks
> Steve
>
>
> --- In diesel_mercedes@yahoogroups.com, "David Starbuck" wrote:
> >
> > Steve,
> > What year is yours? Mine is a 79 300D, no springs on mine.
> > -David
> >
> > --- In diesel_mercedes@yahoogroups.com, "Steve Parolin" wrote:
> > >
> > > 300D, non turbo.
> > >
> > > I dont have spring bolts at the junction between the Exhaust manafold and the down pipe, I beleive there should be, none of the chains, nor my online searches have turned up spring bolts or anything else for this junction.
> > > I have straight through bolts, and they have to be re-tightened every six months or so.
> > >
> > > What doese everyone else have ?
> > > Bolts, Studs, Bolts with springs, studs with springs.....
> > >
> > > Thanks,
> > > Steve
> > >
> >
>
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