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  #16  
Old 02-10-2006, 03:31 AM
crazy banana's Avatar
1983 MB 300D Turbodiesel
 
Join Date: Apr 2005
Location: Houston, Texas
Posts: 81
you might want to check if the pin on the balancer is still there. without the pin, your tach won't work. mine was broken by the oil pan bolt. someone strip the thread on the oil pan so they put a nut on top of it. i had to make a new pin out of a cut-off bolt.

http://pg.photos.yahoo.com/ph/mazzy_1234/detail?.dir=4519&.dnm=6695.jpg&.src=ph
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  #17  
Old 02-10-2006, 11:27 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
Thanks, I will check on that, however, the gauge did work "occassionally" when I first got the car, sometimes it'd work great for 10 mins, then go sporatic, then die. It hasn't even jittered in years now though...
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-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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  #18  
Old 02-13-2006, 05:14 PM
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Join Date: Feb 2006
Posts: 2
Tach Problems

Did you ever fix it? I have the same symptoms on my '84 300SD.

Jim
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  #19  
Old 02-13-2006, 05:36 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
Its been snowing and freezing out lately, and I've been very busy, so I haven't had a chance to check for the pin, I'll look by wednesday though. If the pin is missing what is a suitable replacement? Does a bolt stuck in the same spot work acceptably? I am doubting the pin is missing since the tach used to be "jumpy" before it went completely dead. Who knows....
__________________
-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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  #20  
Old 02-14-2006, 12:32 PM
MS Fowler's Avatar
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Join Date: Jan 2003
Location: Littlestown PA ( 6 miles south of Gettysburg)
Posts: 2,208
I also have an '82 300SD with a dead tach. The pin is in the pulley. Is it supposed to be at an angle to the pulley, or should it stick straight out?
I also pulled the 3 pin connector from the diagnostic plug. I could not measure ANY continuity among any combination of the three connections. Should there be some measureable resistance in that pickup coil?
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  #21  
Old 02-14-2006, 02:34 PM
crazy banana's Avatar
1983 MB 300D Turbodiesel
 
Join Date: Apr 2005
Location: Houston, Texas
Posts: 81
the pin should stick straight out and have certain distance from the sensor. i think it might be magnetic or something.
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  #22  
Old 02-14-2006, 03:35 PM
Old300D's Avatar
Biodiesel Fiend
 
Join Date: Apr 2004
Location: Denver, CO
Posts: 1,883
Quote:
Originally Posted by crazy banana
the pin should stick straight out and have certain distance from the sensor. i think it might be magnetic or something.
It just has to be made of steel. There is a coil in the pickup that detects the moving pin, kind of like an electric guitar.
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http://i16.photobucket.com/albums/b1...oD/bioclip.jpg
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  #23  
Old 02-14-2006, 06:33 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
Quote:
Originally Posted by crazy banana
the pin should stick straight out and have certain distance from the sensor. i think it might be magnetic or something.

Ok, based on that I am pretty sure my pin is missing, I'll check for sure tomorrow....but in the past when working on the water pump/belts etc...I never remember seeing any "pin" nor do I notice anything going past when its running. Its supposed to be right in the middle of the balancer?
__________________
-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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  #24  
Old 03-04-2006, 09:52 PM
Registered User
 
Join Date: Mar 2006
Location: Asheville, NC!!!
Posts: 215
can someone supply a pic of what the RPM relay looks like

I'm having the same problem with my '82 300D, The tac is just dead.
Can someone supply a pic of what the RPM relay looks like to clairify where it is. This is something that I definitly would like to fix.

'82 MB 300D, Greasel
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  #25  
Old 03-04-2006, 10:04 PM
crazy banana's Avatar
1983 MB 300D Turbodiesel
 
Join Date: Apr 2005
Location: Houston, Texas
Posts: 81
here is what it looks like. its located on the driver side under the hood on top of the fender

http://img.eautopartscatalog.com/live/P401312022VDO.JPG
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  #26  
Old 03-05-2006, 02:38 PM
Registered User
 
Join Date: Mar 2006
Location: Asheville, NC!!!
Posts: 215
rpm location

Quote:
Originally Posted by crazy banana
here is what it looks like. its located on the driver side under the hood on top of the fender

http://img.eautopartscatalog.com/live/P401312022VDO.JPG
i've seen this but i've been told it's some kind of diagnostic compute plug in for dealer service....is this true as well

Rolling on Greasel
1982 300D
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  #27  
Old 04-04-2006, 12:40 AM
Registered User
 
Join Date: Apr 2006
Posts: 1
Btt

Anybody fix their tach problems?
I just purchased an '82 300SD with a non-op tach. The tach amp body does not look like it comes apart on mine. I cant see how to get inside of it to put spacers in without breaking it.
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  #28  
Old 04-04-2006, 12:48 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
Nope, as of yet no success, I am going to try crimping the ends of my amp to get the best connection possible, if that fails, I am going to put the amp in the street infront of my rear tire, and do a burnout on it, melting it to oblivian. Kidding.
__________________
-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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  #29  
Old 09-01-2006, 10:31 PM
Brian Perkins
 
Join Date: Aug 2006
Location: High Point, NC
Posts: 127
Paw, Any success yet?

I got mine working by cleaning the amplifier contacts of both the plug and the socket and then putting about a 1/4" of foam pipe insulation inside the cap behind the amplifier.

(By the way, I'm from Plainwell.)

Last edited by PerkHouse; 09-04-2006 at 04:56 PM.
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