Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
Don, what you are looking at is the control pressure/kick-down cable. The modulator is right in front of the Neutral safety switch at the left side right above the pan.. On 11/13/05, OK Don [EMAIL PROTECTED] wrote: I did adjust the VCV - and it made a little bit of difference, but not a lot. Under WOT - it takes almost a full second to complete a shift from 1-2 or 2-3. This the 722.418 transmission - guess I need a technical resource with where to measure what, etc. I don't think I have a gauge that will measure 15.6 bar +/-1.0. If it's where I think it is, the modulator is on top of the tranny on the passenger side. I think that's where the vacuum line ends. I can only see the bottom side of it. Don't see how one would make any adjustments to it with the tranny in place. On 11/13/05, Marshall Booth [EMAIL PROTECTED] wrote: OK Don wrote: I'm missing something here - I can't find where/how to adjust the shift hardness on this car. Chassis - 124.128 Engine - 602.962 Tranny - 722.418 The sifts on this car are softer than I'd like - just short of flaring. I like a nice crisp shift under WOT. I don't have the 124 manual, but it looks like this engine is referenced on the 126 manual that I do have, in the injection system section. However, if it's right, the adjustment lever must be between the VCV and the IP - meaning you have to remove it? There is also mention of rotating the VCV with the throttle at the full open stop (with the engine running?). You rotate the VCV till you feel resistance. Does this affect the shifts? What's the right way to adjust the shifts, and where is it done? The 722.3/.4 series transmissions for turbodiesels manufactured from the mid '80 on shifted MUCH more smoothly than all of the previous versions. That's a feature, NOT a flaw! To increase the firmness of the shifts beyond what was intended WILL result in premature wear. I suggest that you measure the pressures and set them to the intended values (I don't have confirmed settings for your model - 1990+ 124.128 - the last setting I have are for '89 cars with a 722.418 transmission - a mod pressure of 3.25 bar and a working pressure of 15.6 bar +/-1.0). Much of the illusion of soft shifts comes from the high stall speed of the torque converter used in later turbodiesel cars - much higher (~20-25%) than the converters used until 1985. With these later transmissions, the difference in engine speed between the engine driving the car and the car driving the engine can be more than 600 rpm - the earlier transmissions (and those for normally aspirated diesels) seldom vary more than about 100 rpm. I DO prefer that tighter coupling, but you'd need to re-engineer the torque converter to accomplish that. Adjusting the shift firmness beyond the factory settings would only damage the transmission. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/ ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
The control box is on the side of the IP, has three hoses on it and two screws in slots. loosen screws, hold throttle wide open (engine off, since you don't want to toss a rod), rotate clockwise until you feel slight resistance. If that doesn't fix it you will need to adjust the modulator itself. peter
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
never had to do it on a Benz, but the tightness of the shifts are controlled by a spring in the modulator and on GM and some Chryslers there is a screw inside the modulator where the vacuum line connects. To tighten the shift you turn the screw clockwise and to soften the shift its counter clockwise. Basically all you are doing is putting tension on the spring to control how much vacuum is needed to shift. 69 280 SEL 120,000 Miles 72 350SL 108,000 Miles 2004 VW Passat 4 Motion 1999 Mazda Miata -Original Message- From: OK Don [EMAIL PROTECTED] To: Mercedes mailing list [EMAIL PROTECTED] Sent: Sat, 12 Nov 2005 20:59:53 -0600 Subject: [MBZ] '90 300D 2.5 transmission modulator adjustment I'm missing something here - I can't find where/how to adjust the shift hardness on this car. Chassis - 124.128 Engine - 602.962 Tranny - 722.418 The sifts on this car are softer than I'd like - just short of flaring. I like a nice crisp shift under WOT. I don't have the 124 manual, but it looks like this engine is referenced on the 126 manual that I do have, in the injection system section. However, if it's right, the adjustment lever must be between the VCV and the IP - meaning you have to remove it? There is also mention of rotating the VCV with the throttle at the full open stop (with the engine running?). You rotate the VCV till you feel resistance. Does this affect the shifts? What's the right way to adjust the shifts, and where is it done? -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/ ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net ___ Try the New Netscape Mail Today! Virtually Spam-Free | More Storage | Import Your Contact List http://mail.netscape.com
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
Well the shifts on that car will be soft, much softer than you are used to. Those things are so complicated vacuum wise Im not aware of the procedure for adjusting it to spec. I suppose you could just yank the line to the tranny and plug it off. OK Don wrote: I'm missing something here - I can't find where/how to adjust the shift hardness on this car. Chassis - 124.128 Engine - 602.962 Tranny - 722.418 The sifts on this car are softer than I'd like - just short of flaring. I like a nice crisp shift under WOT. I don't have the 124 manual, but it looks like this engine is referenced on the 126 manual that I do have, in the injection system section. However, if it's right, the adjustment lever must be between the VCV and the IP - meaning you have to remove it? There is also mention of rotating the VCV with the throttle at the full open stop (with the engine running?). You rotate the VCV till you feel resistance. Does this affect the shifts? What's the right way to adjust the shifts, and where is it done? -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/ ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 85 380SE, 85 300D, 84 250 LWB, 83 300TD, 81 300TD, 81 240D, 81 240D, 76 450SEL, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
I suspect that would be a little harder than I'm looking for. I'd like it to be like the SDL --- I'll try adjusting the VCV till you feel resistance and see what happens. On 11/12/05, Kaleb C. Striplin [EMAIL PROTECTED] wrote: Well the shifts on that car will be soft, much softer than you are used to. Those things are so complicated vacuum wise Im not aware of the procedure for adjusting it to spec. I suppose you could just yank the line to the tranny and plug it off. -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
Thius is a pretty good article on the MB trannies, how they work and what to adjust. http://www.continentalimports.com/ser_ic20242.html On 11/13/05, OK Don [EMAIL PROTECTED] wrote: I suspect that would be a little harder than I'm looking for. I'd like it to be like the SDL --- I'll try adjusting the VCV till you feel resistance and see what happens. On 11/12/05, Kaleb C. Striplin [EMAIL PROTECTED] wrote: Well the shifts on that car will be soft, much softer than you are used to. Those things are so complicated vacuum wise Im not aware of the procedure for adjusting it to spec. I suppose you could just yank the line to the tranny and plug it off. -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/ ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
Thanks! On 11/13/05, Hans Neureiter [EMAIL PROTECTED] wrote: Thius is a pretty good article on the MB trannies, how they work and what to adjust. http://www.continentalimports.com/ser_ic20242.html -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
OK Don wrote: I suspect that would be a little harder than I'm looking for. I'd like it to be like the SDL --- I'll try adjusting the VCV till you feel resistance and see what happens. I would warm up the engine, then unhook the vacuum (and plug the source) and take it for a brief drive. If I liked the way it shifted at full throttle, I'd then go after the VCV. If I didn't like the zero vac shifting at full throttle, I'd adjust the modulator before touching the control valve. Note: when driving with no vacuum, shifting will be very harsh except at full throttle.
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
I did adjust the VCV - and it made a little bit of difference, but not a lot. Under WOT - it takes almost a full second to complete a shift from 1-2 or 2-3. This the 722.418 transmission - guess I need a technical resource with where to measure what, etc. I don't think I have a gauge that will measure 15.6 bar +/-1.0. If it's where I think it is, the modulator is on top of the tranny on the passenger side. I think that's where the vacuum line ends. I can only see the bottom side of it. Don't see how one would make any adjustments to it with the tranny in place. On 11/13/05, Marshall Booth [EMAIL PROTECTED] wrote: OK Don wrote: I'm missing something here - I can't find where/how to adjust the shift hardness on this car. Chassis - 124.128 Engine - 602.962 Tranny - 722.418 The sifts on this car are softer than I'd like - just short of flaring. I like a nice crisp shift under WOT. I don't have the 124 manual, but it looks like this engine is referenced on the 126 manual that I do have, in the injection system section. However, if it's right, the adjustment lever must be between the VCV and the IP - meaning you have to remove it? There is also mention of rotating the VCV with the throttle at the full open stop (with the engine running?). You rotate the VCV till you feel resistance. Does this affect the shifts? What's the right way to adjust the shifts, and where is it done? The 722.3/.4 series transmissions for turbodiesels manufactured from the mid '80 on shifted MUCH more smoothly than all of the previous versions. That's a feature, NOT a flaw! To increase the firmness of the shifts beyond what was intended WILL result in premature wear. I suggest that you measure the pressures and set them to the intended values (I don't have confirmed settings for your model - 1990+ 124.128 - the last setting I have are for '89 cars with a 722.418 transmission - a mod pressure of 3.25 bar and a working pressure of 15.6 bar +/-1.0). Much of the illusion of soft shifts comes from the high stall speed of the torque converter used in later turbodiesel cars - much higher (~20-25%) than the converters used until 1985. With these later transmissions, the difference in engine speed between the engine driving the car and the car driving the engine can be more than 600 rpm - the earlier transmissions (and those for normally aspirated diesels) seldom vary more than about 100 rpm. I DO prefer that tighter coupling, but you'd need to re-engineer the torque converter to accomplish that. Adjusting the shift firmness beyond the factory settings would only damage the transmission. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/
Re: [MBZ] '90 300D 2.5 transmission modulator adjustment
the modulator is on the drivers side, on the side of the tranny right above the pan. OK Don wrote: I did adjust the VCV - and it made a little bit of difference, but not a lot. Under WOT - it takes almost a full second to complete a shift from 1-2 or 2-3. This the 722.418 transmission - guess I need a technical resource with where to measure what, etc. I don't think I have a gauge that will measure 15.6 bar +/-1.0. If it's where I think it is, the modulator is on top of the tranny on the passenger side. I think that's where the vacuum line ends. I can only see the bottom side of it. Don't see how one would make any adjustments to it with the tranny in place. On 11/13/05, Marshall Booth [EMAIL PROTECTED] wrote: OK Don wrote: I'm missing something here - I can't find where/how to adjust the shift hardness on this car. Chassis - 124.128 Engine - 602.962 Tranny - 722.418 The sifts on this car are softer than I'd like - just short of flaring. I like a nice crisp shift under WOT. I don't have the 124 manual, but it looks like this engine is referenced on the 126 manual that I do have, in the injection system section. However, if it's right, the adjustment lever must be between the VCV and the IP - meaning you have to remove it? There is also mention of rotating the VCV with the throttle at the full open stop (with the engine running?). You rotate the VCV till you feel resistance. Does this affect the shifts? What's the right way to adjust the shifts, and where is it done? The 722.3/.4 series transmissions for turbodiesels manufactured from the mid '80 on shifted MUCH more smoothly than all of the previous versions. That's a feature, NOT a flaw! To increase the firmness of the shifts beyond what was intended WILL result in premature wear. I suggest that you measure the pressures and set them to the intended values (I don't have confirmed settings for your model - 1990+ 124.128 - the last setting I have are for '89 cars with a 722.418 transmission - a mod pressure of 3.25 bar and a working pressure of 15.6 bar +/-1.0). Much of the illusion of soft shifts comes from the high stall speed of the torque converter used in later turbodiesel cars - much higher (~20-25%) than the converters used until 1985. With these later transmissions, the difference in engine speed between the engine driving the car and the car driving the engine can be more than 600 rpm - the earlier transmissions (and those for normally aspirated diesels) seldom vary more than about 100 rpm. I DO prefer that tighter coupling, but you'd need to re-engineer the torque converter to accomplish that. Adjusting the shift firmness beyond the factory settings would only damage the transmission. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- OK Don, KD5NRO Norman, OK '90 300D, '87 300SDL, '81 240D, '78 450SLC The FSM created the Diesel Benz http://www.venganza.org/ ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 85 380SE, 85 300D, 84 250 LWB, 83 300TD, 81 300TD, 81 240D, 81 240D, 76 450SEL, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts
