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3rd Pedal

Started by sutekh, 01 April 2022, 08:32 AM

sutekh

Would have been fair to think I'd given up on this project as so often happens with these threads. False! Just taking my time amassing parts.  ;)

Speaking of which, I received a 70kg special delivery from a very nice gentleman in Belgium yesterday. That's a NOS 717.402 5-speed sitting front and center  ;D  ;D  ;D

Additionally (clockwise from top left):

  • Sachs clutch disk
  • OM617 manual trans flywheel from a G-Wagon
  • w126 5-spd shifter pictured earlier in the thread above, but rebuilt with all new bushings
  • 2x new guibos and a CSB for the driveline
  • Pedal cluster also pictured in thread above, but completely rebuilt with new pedal rubber, clutch master, bushings, and sand-blasted / painted
  • Shift rods from a w126 280SE galvanized and painted
  • r107 560SL speedometer (717.402 has an electronic pickup, but I may machine the tail housing to retain my mechanical speedo)
  • Pressure plate and slave cylinder

Aside from a few lingering incidentals, that's a complete BOM! I need to wrap up another project to get a different car off of my lift, and then it's game on! I'll also be installing a Time Valve stainless exhaust I received last month while I'm at it  ;D

IMG_20230507_130431_748.jpg

Randys01


orientrot

You are fulfilling a dream I had many moons ago before I decided to ditch diesel haha. We have the equivalent set up going into my dad's W123 with the rebuilt engine from my 300SD (changed to 123 spec of course). We're currently figuring out the mounting of an '02 E55 engine in his other 300D with a 6-speed, just picked up an electronic to mechanical speedo converter box because unfortunately the electronic 123 speedometers are rare and expensive.
75 450SEL
80 300SD- cancelled project
83 300D- 5-speed OM617
84 300D- AMG 5.4L N/A M113 6 speed
92 300D- 722.6 OM603 3.5
93 190E 2.6 Sportline LE x2- 6-speed M111 turbo, 3.0 M103
02 C320 Wagon
03 Sprinter 2500
06 E500 4Matic Wagon- AMG 5.4L NA M113

sutekh

Quote from: orientrot on 08 May 2023, 10:52 PMJust picked up an electronic to mechanical speedo converter box because unfortunately the electronic 123 speedometers are rare and expensive.

We're grappling with the same challenge here. I'd have just retained the mechanical speedo had this box of mine been a 717.401 instead. As it is, its clear that they use the same tailpiece casting. It has a hole on one side that's been machined open for the inductive speed sensor, and a hole on the other that still plugged for the mechanical wormgear.

If you look closely at the pic of the trans above, you'll note the gear and spacer for mechanical conversion zip-tied to the output shaft (guy I bought the trans from was nice enough to include those from his parts bin). I now have a decision to make...

  • Stick with the OE 120mph mechanical speedo, machine open the other hole in the tailpiece (and plug the other hole), take apart the trans, and replace the internal bits. Or...
  • Remove the cable and convert to electronic using the 160mph r107 speedo pictured (as you say, the 85mph w123 electronic speedos are rare)!

Option 2 is more work and more $$$, but it doesn't require attempting to modify a very rare and very expensive transmission. I do also like the idea of an electronic speedo overall, as they're more accurate at low speed and less prone to wear (my needle is already pretty bouncy between 0-10mph).

If I stick with that plan though, I'll need a PWM converter to calibrate the speedo. I'm planning on building one of these to accomplish that: https://members.rennlist.com/tom86951/Speedometer%20Calibrator%20Page1.html

BTW, what hall speed sensor are you using on your 717.402? I still haven't sourced that bit, and the w126 part is ~$250 new / $100 used. I suspect any much more pedestrian sensor of proper diameter & length would work just fine though.

orientrot

Quote from: sutekh on 09 May 2023, 06:28 AMBTW, what hall speed sensor are you using on your 717.402? I still haven't sourced that bit, and the w126 part is ~$250 new / $100 used. I suspect any much more pedestrian sensor of proper diameter & length would work just fine though.

I wasn't sure but ours actually is a 722.401, out of a 123 240D and I have a collection of diffs and matching speedos to deal with that on that swap, so unfortunately I can't answer your question.

The converter box we got for the E55-engined 300D was a Dakota Digital ECD-200BT-1; we live near a Summit Racing and they had an open box one for half price. The cable/shaft itself is the same diameter as the Mercedes ones but the screw connector is different and will need to be modified.

I am putting one of those electronic 160mph r107 speedo's in my 450SEL when I drop in the Euro 5L M117 I was able to find for it. It's also getting a 722.6 and the controller (OFGear) has a electronic speedo output. I'm doing W126 gen 2 V8 front spindles and brakes and will use the ABS sensors from that for the speed sensor signal.
75 450SEL
80 300SD- cancelled project
83 300D- 5-speed OM617
84 300D- AMG 5.4L N/A M113 6 speed
92 300D- 722.6 OM603 3.5
93 190E 2.6 Sportline LE x2- 6-speed M111 turbo, 3.0 M103
02 C320 Wagon
03 Sprinter 2500
06 E500 4Matic Wagon- AMG 5.4L NA M113

JeffCullen

Great project! I love the 722.1 and think it suits the car, but an extra ratio would be nice for highway runs. I haven't driven a car with a 617.95x and a manual, but on the 115 four cylinder diesels it's remarkable how much quicker a four-speed manual feels compared to an automatic.

Curious to hear what you think of that Timevalve exhaust as well -- particularly the sound.
1979 300SD #6680 - Astralsilber - 153,750km
1998 E300 Turbodiesel - Rauchsilber - 172,000km