So, I keep reading about how far off people's Mercedes speedometers are on the older models. Mines is TERRIBLY off! @75 MPH it's reading 65.

So, what goes wrong that causes them to be so far off? What's the fix to get it reading right?

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1980 240D (Mileage Unknown, broken odo say's 160K)
1985 300SD (213K) SOLD

The speedometer in my W115 is off by 1-2 MPH. The one in my 280CE is dead accurate. Wonder what causes them to read incorrect speeds.

Are you sure you have the correct speedometer, or rear axle in your car? You should have a 2.88:1 rear axle. Usually they're aren't off by 10 MPH...

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Mine is off by about 5mph pacing with the 2006 A4. So I'm not sure what the actual number is. But if I am going "65" I seem to be passing most people.

Based on what I'm finding (617.952--not .951 engine and tranny that doesn't match what went in an 85 300SD), I wouldn't be surprised if the rear end was different too.

Any tips on finding out which rear end is in mine? (ie. where to look?)

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1980 240D (Mileage Unknown, broken odo say's 160K)
1985 300SD (213K) SOLD

My 78 240D is off by ten but the tach on the dash tells me its been changed

Not the original instrument panel.

.

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Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

The differential is stamped. On the bottom left corner you'll see a small flat spot, clean that off very good and you'll see the ratio.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

My 300SD is spot on all the way through 80, my 300e is off but the instrument panel was either tampered with or replaced at some point...car has salvage history and the odometer is messed up too.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Thanks. I'll take a look when I climb under there next time.

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1980 240D (Mileage Unknown, broken odo say's 160K)
1985 300SD (213K) SOLD

My 300E's original speedometer is dead on accurate..... ~.5mph off at most. My spare cluster on the other hand is 6-8mph off. I wonder if you can re-index the speedometer needle like the other gauges when disassembled?

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

All 3 of mine are dead on the money!!
Well, the '85 wagon was until I changed the tire size from stock. Wasn't the car's fault......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Mine's pretty darn accurate...even when it starts bouncing. . .

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1984 300D, 228k, Light Ivory, Java MB-Tex

Mines 5 off. Probably the tires though.

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1981 300TD 4 speed manual
Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light

So you really are traveling at 15, 30, 20, 40, 35 MPH?

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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!

Well, you have to figure that at some point in the bouncing it will cross the actual speed, so it's momentarily accurate

Yep, that's what I meant.

My bouncing isn't too severe, only a range of 3mph max...more twitchy than bouncy, really. And, it only happens at high speeds, and then, only sometimes...

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1984 300D, 228k, Light Ivory, Java MB-Tex