Replacing Speedometer unit for 560 with 240km/h - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 11-11-2018, 07:00 AM Thread Starter
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Question Replacing Speedometer unit for 560 with 240km/h

Hi All,

New to the forum, the car (560SEC 1990 Euro) and to Mercedes!

I have checked the forums for my problem but ive not found anything directly answering my issue.

So my odometer has given up and i took the unit for a check at our local independent MB specialist. He seems to think that its not a gear/cog problem but the circuit board is the problem. So he has said its better to get a replacement speedometer unit/full cluster.

Now i have a problem where i cannot find another cluster/speedometer that goes up to 240 km/h. The ones i can find for sale are 240 km/h which i understand are not for the 560.

My question is, can i replace the speedometre unit with one which has a 240km/h dial and then replace the dial with a 260km/h one?

Im also attempting to get a second opinion on the unit but im just seeing my options at the moment so any help on this would be very much appreciated!

Thank you
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post #2 of 10 (permalink) Old 11-13-2018, 08:20 PM
KRH
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Usually it is the little plastic small gear at the back that drives the larger white one that simply has deteriorated with age and can easily be replaced as set off ebay.

If it is the circuit board it can be fixed by someone who repairs speedo's

Swapping things around from another parts car can be a bit more complicated
560 SEC/SEL/SE has a 260km/h calibrated speedo and face with the markings on the face appropriate for that set-up
The 420/500 SEC/SEL/SE has a 240km/h calibrated speedo and face with the markings appropriate for that set-up
Your in Dubai so i am assuming your 560SEC is possibly a 300hp version?
The standard lower output 560 engines run a 2.47 ratio diff
The 300hp 560 engines run a 2.65 ratio diff
If your coupe is an AMG modified version? it may run a lower ratio diff 2.82 or 3.06
The gen2 500 SEC/SEL/SE runs a 2.24 high ratio diff

You will need to check the rear face of the diff down on the bottom right corner at a 45deg angle the flat piece that has the diff ratio stamped into the metal (you will need to wipe it clean to read the numbers)

The speedo is electronics and it gets its reading off the spinning cable by measuring the pulse rate.
The pulse rate value for your speedo is stamped on the back of the speedo housing

There are a few people scattered around the globe who can re-set the calibration to the desired value or it is simply easier to just buy one one those Dakota Digital SGI-5C and manually calibrate the speedo reading against a GPS reading off your iphone.

https://www.benzworld.org/forums/w12...a-sgi-5-a.html

Otherwise if chasing a replacement used speedo make sure it matches the pulse rate value stamped on the back of your speedo housing
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87 White Euro 500 "ECE" 265hp SEC
88 Black Euro 560 "RUF"300hp SEC
89 Blue Euro 560 "RUF" 300hp Hydro SEL

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post #3 of 10 (permalink) Old 11-14-2018, 09:25 AM
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KRH is right on the money. As the owner of an '87 560SEC with a 3.06 LSD, I can attest to the usefulness of the great little SGI-5 Dakota Digital speedometer adapter. Follow their instruction and with the use of the GPS functions on your phone, set the speedo perfectly.

Also, that little pinion gear on the end of odometer stepper motor is by far the common failure mode. Tell Garagetastic (sp?) on ebay what car you have and the particulars on it, they'll sell you the correct odometer gear set.
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post #4 of 10 (permalink) Old 12-14-2018, 06:07 AM Thread Starter
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Thank you gentlemen for the help. I am currently looking for someone to assist with the electrical side of things locally and if they are stumped I’ll go ahead and get a 240kmh speedo and stick a 260 dial on top of it and calibrate it with the tool you both recommended.

I have attached the back of the speedo unit just incase there are any visible indications on what the problem could be since I don’t really know what I’m looking at. The cogs look to be ok unless I am missing something!


Thank you
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post #5 of 10 (permalink) Old 12-14-2018, 07:00 AM
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Quote:
Originally Posted by KRH View Post
Usually it is the little plastic small gear at the back that drives the larger white one that simply has deteriorated with age and can easily be replaced as set off ebay.

If it is the circuit board it can be fixed by someone who repairs speedo's

Swapping things around from another parts car can be a bit more complicated
560 SEC/SEL/SE has a 260km/h calibrated speedo and face with the markings on the face appropriate for that set-up
The 420/500 SEC/SEL/SE has a 240km/h calibrated speedo and face with the markings appropriate for that set-up
Your in Dubai so i am assuming your 560SEC is possibly a 300hp version?
The standard lower output 560 engines run a 2.47 ratio diff
The 300hp 560 engines run a 2.65 ratio diff
If your coupe is an AMG modified version? it may run a lower ratio diff 2.82 or 3.06
The gen2 500 SEC/SEL/SE runs a 2.24 high ratio diff

You will need to check the rear face of the diff down on the bottom right corner at a 45deg angle the flat piece that has the diff ratio stamped into the metal (you will need to wipe it clean to read the numbers)

The speedo is electronics and it gets its reading off the spinning cable by measuring the pulse rate.
The pulse rate value for your speedo is stamped on the back of the speedo housing

There are a few people scattered around the globe who can re-set the calibration to the desired value or it is simply easier to just buy one one those Dakota Digital SGI-5C and manually calibrate the speedo reading against a GPS reading off your iphone.

https://www.benzworld.org/forums/w12...a-sgi-5-a.html

Otherwise if chasing a replacement used speedo make sure it matches the pulse rate value stamped on the back of your speedo housing
KRH, all non-North American 560's came with 2.65 ratio differentials. Only North American (US and Canadian) came with the 2.47 ratios.

I agree with you that if you don't have the correct speedometer, you can use the Dakota Digital unit to help calibrate. However, if it were me, I would hold off and keep your eyes peeled for European-based sellers on car forums, auction sites, etc and look for the correct one. To install the Dakota Digital unit, you will have to cut and splice wires in your original loom.

If you don't mind shipping your speedometer unit to the US, I know a talented guy who has repaired my tachometers and modified/fixed my radios perfectly. That is also another option for you.

1980 Mercedes 280TE AMG
1990 Mercedes 560SEL with AMG parts modifications
1991 Mercedes 190E AMG with Brabus 4-cyl M102 2.6
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post #6 of 10 (permalink) Old 12-14-2018, 07:03 AM Thread Starter
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Dr Grillz do the photos I posted in my last reply look normal to you? Gears look ok?

Thank you!
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post #7 of 10 (permalink) Old 12-14-2018, 10:20 AM
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Gen2 euro speedo

I have a gen2 Euro sec I am parting out I can check the speedo on it, I know it is in KM's.
Bob
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post #8 of 10 (permalink) Old 12-14-2018, 10:34 AM Thread Starter
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Quote:
Originally Posted by BARON YOUNGMAN View Post
I have a gen2 Euro sec I am parting out I can check the speedo on it, I know it is in KM's.
Bob
Please do! Keep me updated if it will be available.
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post #9 of 10 (permalink) Old 12-14-2018, 11:46 AM
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Those gears look fine here, it's usually that small one that gives out (DON'T reset the trip meter while rolling, only when stopped) and on my SE it took out the larger white gear. Same on my SEC, the small one split, on both I replaced all 3 as a set

Some days it's just not worth chewing through the restraints
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My Stable:
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Dif-tor heh smusma
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post #10 of 10 (permalink) Old 12-14-2018, 01:05 PM Thread Starter
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Quote:
Originally Posted by wooky_chew_bacca View Post
Those gears look fine here, it's usually that small one that gives out (DON'T reset the trip meter while rolling, only when stopped) and on my SE it took out the larger white gear. Same on my SEC, the small one split, on both I replaced all 3 as a set
Most likely a circuit issue then. Is that wire on the pcb supposed to be there or does it look like someone tried to fix this before?
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