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  #16  
Old 10-20-2012, 09:48 AM
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the gasser speedo is from an 89 300TE, no 4 matic, no asr.
should be a 2.65, same as the diesel.
both speedo heads hooked up to my drill at max RPM both show 70 mph...
it's the cable/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!
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  #17  
Old 10-20-2012, 10:04 AM
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Quote:
Originally Posted by vstech View Post
... a higer ratio speedo hooked to a lower ratio diff, would raise the indicated speed, not lower it.
... I'm not thinking straight...... I can't wait to get over this head cold!
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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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  #18  
Old 10-20-2012, 10:06 AM
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Location: Mount Holly, NC
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why would a gasoline motor with a more powerful motor have a shorter diff ratio than the diesel? in all previous chassis, the gasser variant got 2.47 or 2.24 ratios, to the diesel's 3.07/2.88 why reverse this with the gasser wagon?
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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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  #19  
Old 10-20-2012, 02:39 PM
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Quote:
Originally Posted by vstech View Post
... a higer ratio speedo hooked to a lower ratio diff, would raise the indicated speed, not lower it.
Well, I'm not here to get in a pissing contest with anybody, but your statement is just incorrect, and the reality that exists right before your eyes demonstrates that. That you choose to ignore all the evidence directly before you and cling to your implausible theory is a mystery.

The facts are: the differentials are different ratios, the coordination of differential with speedo head is with regard to any particular ratio is widely known and understood, the evidence before you demonstrates the opposite of your "theory" and confirms the widely held understanding of how these things actually work.

Good luck, particularly for the actual owner of the vehicle under "repair".
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  #20  
Old 10-20-2012, 02:45 PM
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Quote:
Originally Posted by vstech View Post
the gasser speedo is from an 89 300TE, no 4 matic, no asr.
should be a 2.65, same as the diesel.
both speedo heads hooked up to my drill at max RPM both show 70 mph...
it's the cable/trans...
http://www.w124performance.com/docs/mb/other/differentials.pdf
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  #21  
Old 10-20-2012, 03:29 PM
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Quote:
Originally Posted by vstech View Post
why would a gasoline motor with a more powerful motor have a shorter diff ratio than the diesel? in all previous chassis, the gasser variant got 2.47 or 2.24 ratios, to the diesel's 3.07/2.88 why reverse this with the gasser wagon?
I didn't see your post where your corrected yourself before responding previously, but just for the record and for anyone who might read and then rely upon the incorrect info you've provided again. As far as I know all 124 chassis variants with either the OM603 or OM602 inline turbo diesels where equiped with a 2.65 rear differential, even the diesel 4-matic versions. So those are the only vehicles that will have the correct speedo matched to that diff's ratio.

I suspect the diesel 124 cars have that ratio diff because with those engines over their RPM range and their power band the increased torque in combitation with their specific transmission's speed ratios and valve body specifications are most optimally balanced as far as drivability. The engineers at MB have no doubt either in theory or practice run through many possible combinations to eventually decide on the configuration they sold.

With your "all previous chassis" I asume you're referencing 123 and 126 vehicles, it's really not a fair or accurate comparison because diesel 123 and 126 vehicles had significantly lower horse powered engines than most of the gasoline powered engines used in the same chassis except maybe the M102 as used in the 123 chassis.

It is interesting to note that in the case of 123 chassis vehicles that where equiped from the factory with "Special version 15" wheels" where also equiped with higher ratio rear diffs!

Good luck
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  #22  
Old 10-21-2012, 10:28 PM
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I got the car home today!

Update on speedo
Someone changed the speedo in a prior life to a gas speedo.

Car came to me with a 124 542 20 67 speedo, according to EPC that is for a 124.090 300TE.

The speedo from the donor 89 TE that I previously tried is at John's, don't have the number handy but I suspect it is going to cross to a gas as well.

The car should have a 124 542 59 06 (superseded by ...45 65) according to my vin on EPC.

John, I know you got some 124 speedos in your stash, any chance that you got one of the right ones? If not, anyone out there got a spare or know what other numbers might work?

Of course this assumes that no one has fooled with the rear end on this car. Where exactly is the ratio stamp on the pumpkin, I will try to slide under there and have a look if it is visible without having to raise the rear up.

My son and I did some testing with a GPS it is definitely reading slow. The discrepancy is linear and consistent from slow to highway speed. I got to think I have the wrong speedo, if it was the cable or gear problem it would be jumpy and all over the place.
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #23  
Old 10-21-2012, 11:02 PM
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Quote:
Originally Posted by jay_bob View Post
I got the car home today!

Update on speedo
Someone changed the speedo in a prior life to a gas speedo.

Car came to me with a 124 542 20 67 speedo, according to EPC that is for a 124.090 300TE.

The speedo from the donor 89 TE that I previously tried is at John's, don't have the number handy but I suspect it is going to cross to a gas as well.

The car should have a 124 542 59 06 (superseded by ...45 65) according to my vin on EPC.

John, I know you got some 124 speedos in your stash, any chance that you got one of the right ones? If not, anyone out there got a spare or know what other numbers might work?

Of course this assumes that no one has fooled with the rear end on this car. Where exactly is the ratio stamp on the pumpkin, I will try to slide under there and have a look if it is visible without having to raise the rear up.

My son and I did some testing with a GPS it is definitely reading slow. The discrepancy is linear and consistent from slow to highway speed. I got to think I have the wrong speedo, if it was the cable or gear problem it would be jumpy and all over the place.
The actual gear ratio is stamped into the differential's cast steel housing, on either the left or right side of the rear facing mating surface that the rear cover bolts to. There will be a protrusion off to the side about 1 1/2" long and 1/2" or so wide off to the outside of the aluminum cover down on the lower half of the differential. It's usually covered with grease and grime but if you take a rag and wipe it well you will get down to the housing's steel surface and leave just enough grime and grease imbedded in the stamped numbering to make them highly legible! Take a flashlight and your reading glasses down under there with you!
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  #24  
Old 10-22-2012, 12:41 AM
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two of my cars have the 5906, one has the 4565, so I've got one in my parts wagon to test, but it's not for sale. I need it to get the parts wagon, running.
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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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  #25  
Old 10-22-2012, 01:13 AM
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Quote:
Originally Posted by vstech View Post
two of my cars have the 5906, one has the 4565, so I've got one in my parts wagon to test, but it's not for sale. I need it to get the parts wagon, running.
I'm kinda new to this party but as I read it, jay bob bought the car from you which had a speedo from a gasser and no one noticed that the speedo was off before or during that transaction taking place?
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  #26  
Old 10-22-2012, 01:32 AM
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Quote:
Originally Posted by Robert Williams View Post
I'm kinda new to this party but as I read it, jay bob bought the car from you which had a speedo from a gasser and no one noticed that the speedo was off before or during that transaction taking place?
nope, didn't buy from me, I just assisted repairs that were needed on the vehicle.
and the vehicle was purchased as a wreck, the first time either the seller or jaybob drove the car was after most repairs were done, and the car was already owned by jaybob.
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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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  #27  
Old 10-22-2012, 01:48 AM
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Quote:
Originally Posted by vstech View Post
nope, didn't buy from me, I just assisted repairs that were needed on the vehicle.
and the vehicle was purchased as a wreck, the first time either the seller or jaybob drove the car was after most repairs were done, and the car was already owned by jaybob.
Oh OK, I was relying on this part of the thread's first post, where it seemed like you acquired it and owned it "a deal was struck, and now I have another."; and later for jay bob acquired the car and mbselect did the body repair stuff. That's why it seemed like you where the seller, when actually you where just one of the prior owners.

Quote:
Originally Posted by jay_bob View Post
...Anyway between vstech and mbselect I have something new for my son to drive. If you remember from last summer http://www.peachparts.com/shopforum/diesel-discussion/319895-im-lining-up-my-4th-87300td.html.
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  #28  
Old 10-22-2012, 02:08 AM
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nope, not a prior owner either, just the guy who found the car. I've known of the car for the last 2 years, I knew the previous owner, she lived near me, and we've bumped into each other before she wrecked the car. mbselect purchased it from the prior owner, and jaybob got it from him. I just get to help service it.
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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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  #29  
Old 10-22-2012, 03:45 PM
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Yes I was aware going in this was a "as-is" deal and knew the odo was stuck at 210k.
SC motor vehicle laws exempt vehicles > 10 years old from odometer disclosure.

I'm just glad we solved the mystery. Once I was able to research the part numbers it became apparent that both the existing spedo and the speedo from the donor were both the wrong ratio.

Fortunately the 300D from that era, and several other models, use the same ratio rear end so it should not be the end of the world to find a donor speedo with the correct ratio. Thanks tjts1 for posting the spreadsheet, that is like a gold mine for figuring this out.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #30  
Old 10-23-2012, 03:09 AM
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Wagon looks nice jay_bob. I'm going to have to get one too now. Oh well, what's one more MB in the yard?

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