Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts
Nick Gough wrote: BTW, when the A/C is on, and I try to accelerate hard, the car seems slower and I don't hear or feel the A/C cutoff. I could have a faulty switch, I guess. Thanks guys, I really appreciate the advice. I guess since no one has responded on the seat thingy, that no one has a seat or a line on one. I will have to resort to it being repaired, I guess. Ouch!!! :>( Microswitch S27/1 (located near the junction of the accelerator cable and the mechanical linkage to the IP etc.) should shut off the compressor whenever the pedal is floored - or even very near the floor! So the compressor should NOT be on when measuring acceleration! Be SURE that when the pedal is floored that the injection pump lever moves to the stop AND the microswitch "clicks." Make sure when the switch clicks it closes (electrically). Left and right seat bottoms are interchangeable! Marshall -- Marshall Booth (who doesn't respond to unsigned questions) "der Dieseling Doktor" [EMAIL PROTECTED] '87 300TD 181Kmi,'87 190D 2.5 199Kmi, '84 190D 2.2 227Kmi, '85 190D 2.0 159Kmi, '87 190D 2.5 turbo 234kmi Diesel Technical Advisor MBCA, member GWSection http://www.dhc.net/~pmhack/mercedes/mbooth1.htm
Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts
Joe, I confess... the truent officers have tried to catch me, but I've eluded them... thus far. It seems that the 300SDL is still faster than a Chevette. :>) I'll get this checked out, if I can't do it myself. It appears as if the final verdict could be an ALDA adjustment or a cleanout. Sounds like a RotoRooter job could need to be performed. The car rarely smokes in the summer (in the winter, only during cold starts, even with good glowplugs, etc, etc). Dave, thanks for the pic... I will look into that. It is weird, though, as all has been fine for the last week or so. It has R134 in it and a newer compressor. BTW, when the A/C is on, and I try to accelerate hard, the car seems slower and I don't hear or feel the A/C cutoff. I could have a faulty switch, I guess. Thanks guys, I really appreciate the advice. I guess since no one has responded on the seat thingy, that no one has a seat or a line on one. I will have to resort to it being repaired, I guess. Ouch!!! :>( Nick Gough Dayton [EMAIL PROTECTED] wrote: -- Message: 1 Date: Mon, 1 Aug 2005 09:20:19 -0700 From: Joe Knight Subject: Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts To: Mercedes mailing list Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ISO-8859-1 You've pretty obviously been playin' hooky for a while now, Nick. ;) Your times are on the slow side, but before you start foolin' with the wastegate you need to patch in a pressure gauge to the boost line to the ALDA, preferably right near it rather than further upstream, and run it into the passenger compartment (out thru the back of the open hood and back in at the front door jamb works fine using standard vac line). Take it for a good full throttle run and see what kind of boost it's showing at speed. If it's not at least in the 8-10 psi range you want to make sure that the fitting on the manifold and the pressure lines themselves aren't plugged and that the overboost protection switch is working. You can, at least temporarily, bypass that last as a diagnostic aid. After you've confirmed decent boost and if it's still slow, you'll want to pressurize the ALDA direct with your gauge hooked up so as to make sure it's able to transmit the info the pressure line is sending on to the pump. Without the additional fuel that the ALDA calls in, no amount of boost is going to improve your performance one whit, and too much boost is just and only a direct power drain. If everything else looks ok, you might benefit some from an ALDA adjustment. joe On 8/1/05, Nick Gough wrote: > > > In my early efforts to sell the 86 300SDL (I've postponed that one a year or > so... finances), someone mentioned after driving it, that the turbo was weak > and it needed to be adjusted. He suggested that it was a valve of some sort. > I've always thought that the only adjustment on any turbo was the wastegate. > The car does fine with the A/C off, in the 0-60mph run (about 14 secs) and > about 16-18 secs with the A/C on. > > A/C is another story... most of the time it is great, but sometimes it just > doesn't kick in... like a switch or fuse is keeping the compressor from > kicking in. > > Anyone with advice? ------------------ Message: 5 Date: Mon, 1 Aug 2005 10:33:16 -0600 From: "Dave M." Subject: Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts To: [EMAIL PROTECTED] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ISO-8859-1 Hi Nick, It's highly unlikely the turbo wastegate needs adjustment. More likely is the ALDA needs a slight tweak. Your numbers are pretty close to spec, you should be approx 13 seconds to 60mph near sea level assuming your speedo is accurate (check with GPS) and you are using a stopwatch for timing. If you put a boost gauge on the car, put a "T" in the line to the ALDA, spec is 12-14psi at 4000rpm at full throttle under load. Most OM603's are set around 12psi, in my experience. A half-turn CCW of the ALDA screw might be enough to help things out, maybe a full turn if you don't get excess smoke leaving a stop. The odd part is the car is slower with the AC on. There is a WOT cutout switch on the throttle linkage that is supposed to turn of the AC compressor at full throttle. Perhaps your throttle linkage is not adjusted properly, or the switch is faulty, or a wire is broken. With the AC on, you should be able to push the switch with your finger and observe the compressor turn off while the switch is engaged. Here's a photo of the switch: http://www.w124performance.com/images/OM603_misc/microswitch.jpg Not sure about the AC engagement issue, could be one of a number of things - not sure where to start. I'm not a W126 expert so I'll let someone else pipe up on that topic. :-) HTH, Dave M. Boise, ID - Start your day with Yahoo! - make it your home page
Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts
Hi Nick, It's highly unlikely the turbo wastegate needs adjustment. More likely is the ALDA needs a slight tweak. Your numbers are pretty close to spec, you should be approx 13 seconds to 60mph near sea level assuming your speedo is accurate (check with GPS) and you are using a stopwatch for timing. If you put a boost gauge on the car, put a "T" in the line to the ALDA, spec is 12-14psi at 4000rpm at full throttle under load. Most OM603's are set around 12psi, in my experience. A half-turn CCW of the ALDA screw might be enough to help things out, maybe a full turn if you don't get excess smoke leaving a stop. The odd part is the car is slower with the AC on. There is a WOT cutout switch on the throttle linkage that is supposed to turn of the AC compressor at full throttle. Perhaps your throttle linkage is not adjusted properly, or the switch is faulty, or a wire is broken. With the AC on, you should be able to push the switch with your finger and observe the compressor turn off while the switch is engaged. Here's a photo of the switch: http://www.w124performance.com/images/OM603_misc/microswitch.jpg Not sure about the AC engagement issue, could be one of a number of things - not sure where to start. I'm not a W126 expert so I'll let someone else pipe up on that topic. :-) HTH, Dave M. Boise, ID > -- > Date: Mon, 1 Aug 2005 08:39:48 -0700 (PDT) > From: Nick Gough <[EMAIL PROTECTED]> > Subject: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts > To: [EMAIL PROTECTED] > > > In my early efforts to sell the 86 300SDL (I've postponed that one a year or > so... finances), someone mentioned after driving it, that the turbo was weak > and it needed to be adjusted. He suggested that it was a valve of some sort. > I've always thought that the only adjustment on any turbo was the wastegate. > The car does fine with the A/C off, in the 0-60mph run (about 14 secs) and > about > 16-18 secs with the A/C on. > > A/C is another story... most of the time it is great, but sometimes it just > doesn't > kick in... like a switch or fuse is keeping the compressor from kicking in. > > Anyone with advice? > > > Regards, > > > > Nick Gough > > 86 300SDL 168k miles
Re: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts
You've pretty obviously been playin' hooky for a while now, Nick. ;) Your times are on the slow side, but before you start foolin' with the wastegate you need to patch in a pressure gauge to the boost line to the ALDA, preferably right near it rather than further upstream, and run it into the passenger compartment (out thru the back of the open hood and back in at the front door jamb works fine using standard vac line). Take it for a good full throttle run and see what kind of boost it's showing at speed. If it's not at least in the 8-10 psi range you want to make sure that the fitting on the manifold and the pressure lines themselves aren't plugged and that the overboost protection switch is working. You can, at least temporarily, bypass that last as a diagnostic aid. After you've confirmed decent boost and if it's still slow, you'll want to pressurize the ALDA direct with your gauge hooked up so as to make sure it's able to transmit the info the pressure line is sending on to the pump. Without the additional fuel that the ALDA calls in, no amount of boost is going to improve your performance one whit, and too much boost is just and only a direct power drain. If everything else looks ok, you might benefit some from an ALDA adjustment. joe On 8/1/05, Nick Gough <[EMAIL PROTECTED]> wrote: > > > In my early efforts to sell the 86 300SDL (I've postponed that one a year or > so... finances), someone mentioned after driving it, that the turbo was weak > and it needed to be adjusted. He suggested that it was a valve of some sort. > I've always thought that the only adjustment on any turbo was the wastegate. > The car does fine with the A/C off, in the 0-60mph run (about 14 secs) and > about 16-18 secs with the A/C on. > > A/C is another story... most of the time it is great, but sometimes it just > doesn't kick in... like a switch or fuse is keeping the compressor from > kicking in. > > Anyone with advice?
[MBZ] Turbo adjustment on a 300SDL, A/C & search for parts
In my early efforts to sell the 86 300SDL (I've postponed that one a year or so... finances), someone mentioned after driving it, that the turbo was weak and it needed to be adjusted. He suggested that it was a valve of some sort. I've always thought that the only adjustment on any turbo was the wastegate. The car does fine with the A/C off, in the 0-60mph run (about 14 secs) and about 16-18 secs with the A/C on. A/C is another story... most of the time it is great, but sometimes it just doesn't kick in... like a switch or fuse is keeping the compressor from kicking in. Anyone with advice? BTW, the body looks good now, since ol' Maaco got ahold of it and fixed all rust spots (cutout and re-welded those that were through the metal). I replaced the RF fender, as well. Next item: interior. I'm looking for a driver's seat in cream beige leather that is not ripped or torn. I don't care about sagging springs or discolorations. Wrecking yards don't seem to have one that is any better than mine and not in cream beige for an 85 - 87. Does anyone have one or know of one? Regards, Nick Gough 86 300SDL 168k miles 93 300E 2.8 123k miles 97 Jetta 73k miles - Start your day with Yahoo! - make it your home page
