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#1
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Looking for proper Speedometer /Odo replacement
The odometer on my recently purchased 1985 300TD-t only shows about 80% of the actual mileage.
I know that it is *not* the original speedo. it currently has a 150MPH speed o that shows ~ 58mph at 3000rpm ( if my calculations are correct, when i show 58, I'm doing 72..unless I'm cracked) a 'spare' 100mph speedo, along with the 85 mph one from my 1982 240D both show ~ 54mph at the same RPM. I've found the parts numbers for proper replacement speedo's (per EPC online seems 85mph and 125mph versions are available) *o.k. to the point!* teh parts numbers i have are: a 009 542 67 06 ( 85 mph) a 010 542 75 06 (125mph) a 011 542 68 06 (125 mph) (along with some others that "are replaced by" newer part numbers such as those above) the parts numbers that i *SEE* on the speedos are written as: 123.542.37.01 (in the case of the currently installed one) how do i cross-reference these? (is it as simple as ignoring the leading set?) I'd hate to spend money on another unit designed for a different rear-end-ratio. thanks!! Robert |
#2
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I don`t know about your part #. the spedo on my 85 300D has a part#
of 123 542 27 57. my understanding is all 85`s have the 2:88 differential. 60mph Iam@ 3000rpm 65mph 3200 - 3300rpm 55mph 2500 - 2700rpm the spedo is matched to the diff gear ratio. hope this helps 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 |
#3
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I second that is the correct speedo part # for your '85.
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1983 123.133 California - GreaseCar Veg System |
#4
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hmm those RPM values got me thinking
*I* show 60mph @ ~ 3100 67mph @ ~ 3500 (on 195/70R14 tires) those seem to be about in-line then. leaving me to wonder about my odometer. I took a number of readings vs. mile markers on an interstate over 400 miles round trip. the ODO seemed to be consistently 80% off as opposed to working 80% of the time, then stopping altogether for a bit etc (this is the part there i *assumed* that the whole works was) maybe another roadtrip is in order. |
#5
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scary math time
(aka me thinking out loud) when my speedometer reads 60mph I'mshowing 3100rpm on the tach 3100 RPM * 60 = 186,000RP-hour (engine) if final transmission ratio is 1:1 186,000RP-hour (driveshaft) / 2.88 = 64583.3 RP-hour rear axle 195/70R14 tires get either 852 or 836 revs per mile dep. on brand 64583/852 = 75.8 miles in that same hour for better or worse the above seems to work out to what i *thought* was happening..when taking real- world measurements. (my odo would show 60 miles...80% of the 75miles the interstate said i'd traveled i am assuming the tach is right brain = ow robert |
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