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  #1  
Old 06-11-2008, 03:14 PM
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possible wrong rear? 86 190D

was out cruising in the Benz today and turned on GPS and noticed that the speedo is off by 10mph at 75 (really 65), 65 is 8, 55, is closer to 6. All reading faster then I am really going. Is it possibly someone swapped in a rear at some point and it was the wrong one (what markings on rear would tell me this)?

I am running 185/65/15 which appears to be original for the car, they are low on tread but NOT that low.

Wonder how bad my mpg will be, if I have to spin it so high just to go the speed limit.

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86 190D 420k and counting
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Originally Posted by rcounts View Post
But then I don't worship the engine or view it as something sacred to be protected, babied, and treasured forever either. It is a machine - a fine machine to be sure - but still just a machine, and it is meant to be used. I specifically bought a Mecedes IDI because they are about THE most tolerant engine there is when it comes to alternative fuels, and that's what I wanted - to be able to use alternative fuels.
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  #2  
Old 06-11-2008, 03:43 PM
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Stamped on rearend.

The ratio is stamped on an "ear" of the rearend which is visible by sticking your head under the car (while the car is motionless). I've seen it on the passenger's side or the driver's side, depending on the car.

The other possibility is that you don't have the correct speedometer. (i.e. someone changed the speedo). I don't know if the speedo's are actually marked with the rearend ratio that they are set for.

SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner
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  #3  
Old 06-11-2008, 03:46 PM
ForcedInduction
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Here is the chart for ever ratio the 190 series used.

On the back of your differential there will be a flat spot with the ratio stamped on it.
Attached Thumbnails
possible wrong rear? 86 190D-190-201-rear-axle-ratios.jpg  
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  #4  
Old 06-11-2008, 06:32 PM
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You should be turning 3000rpm at around 75mph with the original 2.65:1 gears and IIRC 155/65-15 tires.
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  #5  
Old 06-11-2008, 07:05 PM
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190D diff ratios

Wondering whether you also could publish such a chart for the W124 model?
Anxious to find which diff will fit into a W124.128. Help much appreciated

my 190D 2.5, 1986, autom. tr. did run about 69 miles at 3000 rpm and my GPS
confirmed this speed. Engine was fairly noisy around 3000 rpm and became quiter again around 3150 rpm



Quote:
Originally Posted by ForcedInduction View Post
Here is the chart for ever ratio the 190 series used.

On the back of your differential there will be a flat spot with the ratio stamped on it.
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  #6  
Old 06-11-2008, 10:49 PM
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I think it's 3.07

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Originally Posted by babymog View Post
You should be turning 3000rpm at around 75mph with the original 2.65:1 gears and IIRC 155/65-15 tires.
Per the chart, the '86 190D 2.5 should have a 3.07 rearend. I think that the 2.5Turbo automatic is the only version with the 2.65 rearend.

SteveM.
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'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner
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  #7  
Old 06-11-2008, 11:09 PM
ForcedInduction
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Quote:
Originally Posted by diesel friend View Post
Wondering whether you also could publish such a chart for the W124 model?
The W201 chart is the only one I have.
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  #8  
Old 06-12-2008, 12:43 PM
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8 sats tracking me on GPS 70mph on speedo, 3300rpm on tach= 62mph

I only found a big 0 (alittle to the right of center) stamped on the rear, although alot of it is covered up by the rear subframe.

94mph=4500 eeek! looks like I might be going back to the junkyard to find a rear. any difference between gasser and diesel rears? if not I know where a 2.6 is with what appeared to be lower miles.

Although I should really find out what kind of MPG this thing will get me before I go swapping rears and making it deathly slow.
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Quote:
Originally Posted by rcounts View Post
But then I don't worship the engine or view it as something sacred to be protected, babied, and treasured forever either. It is a machine - a fine machine to be sure - but still just a machine, and it is meant to be used. I specifically bought a Mecedes IDI because they are about THE most tolerant engine there is when it comes to alternative fuels, and that's what I wanted - to be able to use alternative fuels.

Last edited by sethyboy85; 06-12-2008 at 12:50 PM.
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  #9  
Old 06-12-2008, 01:03 PM
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Stamped...

I've never seen one that didn't have the ratio stamped on one of the lower "pads" which face the rear of the car. These would be the on the lowermost part of the housing. They are not obscured by the subframe. Sometimes they get covered in grime, but a little scraping/degreasing should reveal the ratio.

SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner
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  #10  
Old 06-12-2008, 01:09 PM
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284035 3.42

son of a gun!

So I imagine at some point in it's 400k life the rear got swapped for one out of a 2.2l diesel and if I am reading that right the rear was made in 2/84
Why do I get that rear? Now I am going to go to the JY and pull on. Anything I need to know about pulling the rear, any special tools?
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I am not a post whore, I am a car enthusiast.
86 190D 420k and counting
Quote:
Originally Posted by rcounts View Post
But then I don't worship the engine or view it as something sacred to be protected, babied, and treasured forever either. It is a machine - a fine machine to be sure - but still just a machine, and it is meant to be used. I specifically bought a Mecedes IDI because they are about THE most tolerant engine there is when it comes to alternative fuels, and that's what I wanted - to be able to use alternative fuels.
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  #11  
Old 06-12-2008, 01:17 PM
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12 pt internals.

Off the top of my head, I think that the axle retaining bolts are 12pt internal bolts (sometimes called triple square). I have also heard people say that you should get the matching axles for the rearend if you are pulling from a JY.

Good luck, and I hope it's not too hot and steamy.

SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner
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  #12  
Old 06-12-2008, 01:30 PM
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Quote:
Originally Posted by Jetmugg View Post
Off the top of my head, I think that the axle retaining bolts are 12pt internal bolts (sometimes called triple square).
I have some of those from my dang VW I believe. stupidest design ever!
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I am not a post whore, I am a car enthusiast.
86 190D 420k and counting
Quote:
Originally Posted by rcounts View Post
But then I don't worship the engine or view it as something sacred to be protected, babied, and treasured forever either. It is a machine - a fine machine to be sure - but still just a machine, and it is meant to be used. I specifically bought a Mecedes IDI because they are about THE most tolerant engine there is when it comes to alternative fuels, and that's what I wanted - to be able to use alternative fuels.
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  #13  
Old 06-12-2008, 03:56 PM
ForcedInduction
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Quote:
Originally Posted by Jetmugg View Post
I have also heard people say that you should get the matching axles for the rearend if you are pulling from a JY.
No need for that unless your axle boots are cracked.
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  #14  
Old 06-12-2008, 10:53 PM
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Join Date: Apr 2005
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Quote:
Originally Posted by ForcedInduction View Post
No need for that unless your axle boots are cracked.
x2.

Tom W
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #15  
Old 06-12-2008, 11:27 PM
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most of the rear looks pretty fresh and extremely clean, like somebody did some work on it and then it got wrecked. (I bought it with a pretty well smashed front end) Thats cool, maybe next week I can run up to the JY and pull a rear and snag a front windshield since mine is pretty well cracked. ($10 glass day) haha

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I am not a post whore, I am a car enthusiast.
86 190D 420k and counting
Quote:
Originally Posted by rcounts View Post
But then I don't worship the engine or view it as something sacred to be protected, babied, and treasured forever either. It is a machine - a fine machine to be sure - but still just a machine, and it is meant to be used. I specifically bought a Mecedes IDI because they are about THE most tolerant engine there is when it comes to alternative fuels, and that's what I wanted - to be able to use alternative fuels.
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