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#1
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puting a manual into a 300SD
want to know what tranny would be the simplist to swap into a 1985 300SD any help would be greatly apreaciated
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MPL Son of mplafleur (forum member) 1980 240D (dead) 1988 mazda rx-7 250whp@10psi needs dyno of 15psi |
#2
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anyone have any ideas?
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MPL Son of mplafleur (forum member) 1980 240D (dead) 1988 mazda rx-7 250whp@10psi needs dyno of 15psi |
#3
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The transmission would be the simple part. Any 4-spd manual from a 240D (W123 chassis) will bolt up to that 617 as long as you have the adapter plate that came with the tranny. Finding a clutch pedal cluster that fits the 126 chassis, well that's something else entirely.
You might look for graymarket 126 gassers in the northerastern US...you might just be able to find a rust-out 420SE with a manual that you could steal the parts from.
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Never a dull moment at Berry Hill Farm. |
#4
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I don't think the 380 or the 420 was ever offered with a manual, only the 280.
You have several challenges in this. You will need to find a manual flywheel to fit your diesel (from a 300D), and find an engine plate, as mentioned. Then you will need the clutch hydraulics and shift linkage (you will have to make the rods longer, or shorten some from a 4 cylinder), and driveshaft from a 126 280 or 280SE. You may ultimately come to grief because the end of your crankshaft may not be machined to take a pilot bushing. I have done a couple of these conversions (280E and a 250C). My advise would be not to try this one, but it would be a neat car if you can pull it off.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#5
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There has been a long ongoing thread about this conversion covering every step in detail ,check search if it's not still up in the diesel section............. P.S. the thread is on page two in diesel section and the vehicle is a 123 TD but it has been done in an SD using 240 d parts.........
William Rogers.......... Last edited by william rogers; 05-04-2004 at 04:12 AM. |
#6
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ive seen the 4sd conversion. The guy that i got my 240 from has one, im wondering more about the 5sd 5speed on ebay for 123 btw if anyone has the gear ratios for the two that would be amazing.
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MPL Son of mplafleur (forum member) 1980 240D (dead) 1988 mazda rx-7 250whp@10psi needs dyno of 15psi Last edited by MattLaFleur; 05-04-2004 at 10:15 PM. |
#7
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Now that is a VERY rare duck, at least in the US.
The 123 Haynes manual gives the ratios as 3.82, 2.2, 1.398, 1, and .813. The linkage will be a bear to find. But press on - it would be awesome if you could get it to work.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
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Never a dull moment at Berry Hill Farm. |
#9
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thanks for the help guys.
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MPL Son of mplafleur (forum member) 1980 240D (dead) 1988 mazda rx-7 250whp@10psi needs dyno of 15psi |
#10
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Hello,
The manual flywheel *will fit* but that's about it. The 5 cylinder engines have a much heavier flywheel that is balanced with the crank and crank damper at the factory. It will also be very problematic to find a manual pedal cluster for W126 in North America. My advice is to give this one a miss. Have a good week.
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Nachi11744 |
#11
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Any conversion may has unseen problems ,but that's the gravy that's why we do them, I put a 454 in a 2wd K5 Blazer,sounds simple? I had to fabricate new tranny mounts,build a floor shift unit,have a costom drive shaft made etc. As the only 126 that I can think of that has a manual is the Euro 280 SE and you are not going to find one easily. then you go for 240 parts whether the flywheel is balanced with the engine has been debated before.
But the conversion has been done with the owners being pleased. If I were going to do it (and actualy I have a manual 115 240 and one of my SD's has a bad tranny) I would buy a 240 with a bad engine ,I don't see why the peadal cluster and clucth master and cylinder slave cylinder could not be adapted to fit the 126. and I'll bet a glow plug that the flywheel that will bolt right up from a 240 is the same or very similar in weight to the Euro 300D manual tranny flywheel. If you happen to damage a flywheel on a 240 you can buy a replacement from the dealer which kind of dispells the balanced to the engine theory.Do it!!!!......... William Rogers........ |
#12
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i have a manual 240D that does not run siting in the driveway (thats why i got the 300SD)
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MPL Son of mplafleur (forum member) 1980 240D (dead) 1988 mazda rx-7 250whp@10psi needs dyno of 15psi |
#13
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William is right about the pieces being likely to fit or being made to fit.
You resolve the balancing issue by having the stick FW statically balanced to the automatic - a good machine shop can do it. You need to mark the crank and FW when you remove it so you can put the balanced FW in the right position. That's what I did on my 280E conversion. I would be careful with the FW, though. I would not use a FW designed for a 2.4 123 in a 3.0 126. And I think the 4 speed will be fine - doesn't the 300SD have a low rear-end ratio to begin with? Don't think you would need the overdrive in the 5-speed.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#14
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Never a dull moment at Berry Hill Farm. |
#15
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modified in comparison to the 616/M110(?). I have access to some old fiche if you'd really like me to look up the part numbers, I could also dig out the passage in an old service manual I have (somewhere) which explains differences between the two (and IIRC, also specifically warns AGAINST using the lighter flywheel on a 617...let alone a turbo 617). My opinion is this...there were no factory 617 turbos with manuals* - there must be a reason for this, considering practically every other Benz at the time (in Europe at least) was also offered with a 'stick'. Could be nice, but there are some serious issues to consider here...proceed with this modification "at your own risk"... * this according to an old MB microfiche, at least there was no listing of a 617.95x with a manual trans, nor parts diagram for one either |
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