tachometer and speedometer in w123 + om606
tachometer and speedometer in w123 + om606
How many pulses per revolution gives the old pick up vs the W on the alternator??
how can i sort out the speedometer?? i was planing to transplant a w124 speedometer and adding a sensor and pickup on the outputshaft from gearbox. Any inputs??
Holset power!
I am building a w123 + om606. whant the tachometer to work. Can i connect it to the "W" on the alternator or do i need the pickupthing from my om617.
How many pulses per revolution gives the old pick up vs the W on the alternator??
how can i sort out the speedometer?? i was planing to transplant a w124 speedometer and adding a sensor and pickup on the outputshaft from gearbox. Any inputs??
Holset power!
(03-18-2014, 08:27 AM)john I am building a w123 + om606. whant the tachometer to work. Can i connect it to the "W" on the alternator or do i need the pickupthing from my om617.
How many pulses per revolution gives the old pick up vs the W on the alternator??
how can i sort out the speedometer?? i was planing to transplant a w124 speedometer and adding a sensor and pickup on the outputshaft from gearbox. Any inputs??
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
Idk if this applies to your situation or not but the 1981 W123 300TD uses elecrtonic speedo while '82+ W123 uses mechanical.
(03-18-2014, 08:27 AM)john I am building a w123 + om606. whant the tachometer to work. Can i connect it to the "W" on the alternator or do i need the pickupthing from my om617.
How many pulses per revolution gives the old pick up vs the W on the alternator??
how can i sort out the speedometer?? i was planing to transplant a w124 speedometer and adding a sensor and pickup on the outputshaft from gearbox. Any inputs??
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
(03-18-2014, 02:11 PM)john WHAT?? superinfo, it made my day.
I will start locking for that. Where is the pickup placed on those? Maybe cara with abs have a electric speedo? I have a 79 300d and that i think have a cabel.
Any more exact specs on which one had electric?
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
What transmission are you using?
(03-18-2014, 02:11 PM)john WHAT?? superinfo, it made my day.
I will start locking for that. Where is the pickup placed on those? Maybe cara with abs have a electric speedo? I have a 79 300d and that i think have a cabel.
Any more exact specs on which one had electric?
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
(03-18-2014, 03:13 PM)CRD4x4 What transmission are you using?
(03-18-2014, 02:11 PM)john WHAT?? superinfo, it made my day.
I will start locking for that. Where is the pickup placed on those? Maybe cara with abs have a electric speedo? I have a 79 300d and that i think have a cabel.
Any more exact specs on which one had electric?
Bmw zf gs6-53dz
So no speedsensor there.
Where does 126 take there pick up signal from?
Holset power!
(03-18-2014, 03:13 PM)CRD4x4 What transmission are you using?
(03-18-2014, 02:11 PM)john WHAT?? superinfo, it made my day.
I will start locking for that. Where is the pickup placed on those? Maybe cara with abs have a electric speedo? I have a 79 300d and that i think have a cabel.
Any more exact specs on which one had electric?
Bmw zf gs6-53dz
So no speedsensor there.
Where does 126 take there pick up signal from?
Holset power!
.
Gota love Mercedes Diesels!
.
DeliveryValve
03-19-2014, 03:07 PM #7If I am not mistaken, I do believe the '81 one year only electronic speedo only came in the US spec 300TD Turbo Diesel. Unless there are other 1981 300td Turbo Diesels offered in other countries, perhaps Canada, you won't be getting an electronic speedo in KM but in MPH.
.
Gota love Mercedes Diesels!
.
.
Gota love Mercedes Diesels!
.
DeliveryValve
03-19-2014, 07:29 PM #9Here is my theory. Ultimately, it is cheaper to produce a speedometer inline with the other mechanical units offered in the w123 at the time. The decision was made to borrow the transmission from the 300sd for the 300td to bring it to production faster. They had no choice but to produce the electronic speedo unit until the mechanical speedo transmissions were built.
.
Gota love Mercedes Diesels!
.
I heard it had to do with noise level. First year of a turbodiesel in the USA shouldn't have "noisy" cable driven instruments. Something like that. Then it was found unnecessary? Cable is cheaper? Idk.
(03-19-2014, 04:49 PM)john Any ideas why this is so exclusive?
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
I was too slow to respond...
I heard it had to do with noise level. First year of a turbodiesel in the USA shouldn't have "noisy" cable driven instruments. Something like that. Then it was found unnecessary? Cable is cheaper? Idk.
(03-19-2014, 04:49 PM)john Any ideas why this is so exclusive?
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
back to question number one.
How many pulses per revolution does the "W" phase on alternator give? one per revolution on alternator time its about 4 times smaller than the cranks pulley should make around 4 pulses per engine revolution??
how many does the w123 trigger give?
Holset power!
ok.
back to question number one.
How many pulses per revolution does the "W" phase on alternator give? one per revolution on alternator time its about 4 times smaller than the cranks pulley should make around 4 pulses per engine revolution??
how many does the w123 trigger give?
Holset power!
The crankshaft pulley spins the alternator pulley about 3 or 4 times faster indeed. But, one rpm from the alternator gives about 15 pulses on the W phase (and the others) this is to give a smooth steady voltage. So 15 times 3 is 45 pulses.
The pulses are waaayyyy more. Like +40 per rpm.
The crankshaft pulley spins the alternator pulley about 3 or 4 times faster indeed. But, one rpm from the alternator gives about 15 pulses on the W phase (and the others) this is to give a smooth steady voltage. So 15 times 3 is 45 pulses.
(03-20-2014, 07:35 AM)john ok. and on the 617?
found this tachometer. whats the black thingy on the back? cant remember that i have seen it on any of my tachometers??
For the clock I believe
if it don’t blow black...take it back.
1982 300TDT 4 Speed 196K Standard Beige “VEGEWGN”. 300GD FW. Walbro FRC-8 Fuel Pump. ZadaTech LCD Boost, EGT, & Fuel Pressure gauge. Non-EGR Exhaust and Intake Manifold. 3/2 Valves gone. Soon to have Elsbett WVO conversion
1981 300D 314K Midnight Blue “The Blue Car”, Lovecrap system, owned 25 years+
1985 300TD White 198K “Betty White” Pure beauty
The VEGEWGN
(03-20-2014, 07:35 AM)john ok. and on the 617?
found this tachometer. whats the black thingy on the back? cant remember that i have seen it on any of my tachometers??
For the clock I believe
if it don’t blow black...take it back.
1982 300TDT 4 Speed 196K Standard Beige “VEGEWGN”. 300GD FW. Walbro FRC-8 Fuel Pump. ZadaTech LCD Boost, EGT, & Fuel Pressure gauge. Non-EGR Exhaust and Intake Manifold. 3/2 Valves gone. Soon to have Elsbett WVO conversion
1981 300D 314K Midnight Blue “The Blue Car”, Lovecrap system, owned 25 years+
1985 300TD White 198K “Betty White” Pure beauty
The VEGEWGN
I can say with certainty that I have 2 '85 federal engines in the fleet and they both had sensors on the starter ring gear.
raysorenson
03-20-2014, 02:59 PM #15I think the late '84 and '85 MY use the starter ring gear for the tach. The schematic shows the federal models have the tach wired directly to the 2 wire "engine speed sensor". The cali models look to have the 2 wire speed sensor wired to the egr box and a single wire from the egr box to the tach. Pre- 84 model schematic show a 2 wire "tdc sensor" plugged into a "tdc amplifier" that is connected to the tach with a single wire.
I can say with certainty that I have 2 '85 federal engines in the fleet and they both had sensors on the starter ring gear.
i plan to get a early generation tachometer from a w123 300tdt from the us with the pickup on teh front of the engine, and somehow mod it onto my engine, and use that. if i can make that work.
---------------------------------
daily driver
w115 240d 72hp 3.07 rearend
w123 om602 turbo 200whp 7.5mm pump fivespeed 3.07 rearend
+ a few more.
mbturbo.com
swampmonkey
03-26-2014, 04:52 AM #17if you have a gasser tachometer, go to dakota digital and order a converter, get w+ to dakota digital part, and sync it with a strobelight to the crank, and then connect to the tachometer....
i plan to get a early generation tachometer from a w123 300tdt from the us with the pickup on teh front of the engine, and somehow mod it onto my engine, and use that. if i can make that work.
---------------------------------
daily driver
w115 240d 72hp 3.07 rearend
w123 om602 turbo 200whp 7.5mm pump fivespeed 3.07 rearend
+ a few more.
mbturbo.com
(03-19-2014, 03:07 PM)DeliveryValve If I am not mistaken, I do believe the '81 one year only electronic speedo only came in the US spec 300TD Turbo Diesel. Unless there are other 1981 300td Turbo Diesels offered in other countries, perhaps Canada, you won't be getting an electronic speedo in KM but in MPH.
.
Hello, just in case we may share info of value for both.
I have a 1993 MB 300D turbo, sedan. It was made for Japan, has metric signals I think.
I am on my way to attach a trip computer to it, looking to determine how many pulses per mile or per km the VSS signal has.
Any info available?
On the other hand, I adapted a tachometer to a swap motor in another MB I have.
Oldbeaver
(03-19-2014, 03:07 PM)DeliveryValve If I am not mistaken, I do believe the '81 one year only electronic speedo only came in the US spec 300TD Turbo Diesel. Unless there are other 1981 300td Turbo Diesels offered in other countries, perhaps Canada, you won't be getting an electronic speedo in KM but in MPH.
.
Hello, just in case we may share info of value for both.
I have a 1993 MB 300D turbo, sedan. It was made for Japan, has metric signals I think.
I am on my way to attach a trip computer to it, looking to determine how many pulses per mile or per km the VSS signal has.
Any info available?
On the other hand, I adapted a tachometer to a swap motor in another MB I have.
Oldbeaver
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
oldbeaver, i dunno anything about that setup but if you can get a friend with an oscilloscope to ride with you and record the signal, it should be clear afterwards how the pulses come. buena suerte, eres de santiago?
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
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