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#1
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Is the Speedo/Odo on W123 model-specific?
Hi there,
The Speedo and Odo on my 240D with 4-speed manual needs replacing. Are the speedo/odos model-specific? In other words - different cars have different trannys and rear drive ratios. Are the speedo/odos different from model to model, e.g. 300d, 240d auto, 240d manual? Sorry for being such a noob. Thanks, PE
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83 240D - 4 speed manual - Manilla Beige 189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too! |
#2
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Any 240d speedo for a 123 car should work providing you have the stock diff in the rear.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#3
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Ideally, get the same speedo using the part number stamped on the face. An older speedo might only be up to 85, while the other variants might go higher (even if the car didn't really reach those speeds).
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Are the 240D's immune to this unique one-year feature?
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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg |
#4
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Just about any 123 speedo will fit. But it won't read the miles or the MPH correctly. The only ones that won't are the electric ones mentioned above. What is wrong with your speedo? Usually the odometer stops, and that can be fixed. There are DIY online for it, but I've never had luck making it work in the long term. I've sent two into a Speedo shop and had them fix them. One of them had 60kmile on it since they fixed it. Junkyard Speedos are going to be a gamble. The speedo is one of the weak points of the 123, they always break. Never trust a 123 speedo.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#5
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Here is the DieselGiant how to on fixing the spedo:
How to Repair Your Broken Odometer All 240D`s use the 3:69 diff. auto or manual trans. 300D/TD Na use the 3:46 77 - 81 300D turbo use the 3:07 82 - 84 300D Turbo use the 2:88 1985 The speedometers are geared to the Differential gear ratio. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#6
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If you're brave enough ANY w123 cluster can be modified for ANY diff.
I've taken apart at least 20 of these things and I've only found three differences between the different types. -speedo/odo faceplate -copper spur gear (seen below) -plastic worm gear (seen below) I can't remember the pitch and tooth count on the spur and the worm gears off the top of my head. But if you intend to swap them out COUNT THE TEETH FIRST, they look amazingly similar on the workbench.
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Onus probandi incumbit ei qui dicit, non ei qui negat I recondition w123/w126/w124/w140/r107/r129/ steering boxes! 1984 300D "Elsa" odo reset 6/2011 147k 1983 300TD "Mitzi" ~268k OM603 powered 1995 E300 "Adelheid" 262k [Sold] |
#7
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that bit about counting teeth is varry interesting. i do have several here from different ratios and i'll look at their components when they're on the workbench.
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#8
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yes, the speedo's are model specific for the 123 chassis.
the 240 speedo's ALL are geared for a 3.69 rear diff. the 300 non turbo's are all geared for 3.46 (unless it's a manual trans, then I don't know) the 300 Turbo's up to 1984 are geared for a 3.07 diff, in 85 the turbo's got the 2.88 Diff. the one anomaly is the 81 Wagon. it's got a electronic driven speedometer, and is only useful on that vehicle.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#9
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And, don't forget the very ends of the cable which go into the tranny and the end of the speedometer. There appears to be two different types: one is blade type and the other is squared and I suggest you don't jam the blade type into the squared ends and vice versa.
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#10
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#11
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Mr. Technical ... LOL |
#12
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THat was due to Mercedes using the 617.951 from the 'SD, right? Is this only the case only for wagons?
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
#13
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Actually there is a difference I have noticed between the speedos for an automatic car and a stick car with the same engine. The maximum rpm hash marks on the face are a little lower on an automatic equipped car due to I presume, slippage. ... one or two mph, IIRC.
Not enough to worry about.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#14
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no, it's because the 722.3 was only set up for the SD at the time, the engine is still a 617.952 (the first vehicle to get that variant .952 I think...) the NA vehicles all got the 722.2 trans...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#15
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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