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Car Forum / Mercedes-Benz Cars / June 2007Repair of tach amplifier in 116 series, 300SD
I have another tach amp going bad in my 300SD. I recall seeing some discussion here about how to maybe salvage this one, before buying a new one. It's intermittent, but it's not the contact pins, I've cleaned and reseated them several times. Any other tips? Seems like it could be a bad solder joint inside? But I can't figure out how to get the innards out of the top of the cap withour breaking it apart. TIA! Fooling with it is a losing proposition, IMHO. BUT I've pulled the guts from the cap and placed a bit of foam inside and snapped the amp back into the cap. It worked - for a while. Now its intermittent - again. This is one of the few weaknesses of this otherwise fine model. '80 300SD @ 110K miles  Signature© 2007 T.G.Lambach. Publication in any form requires prior written permission. >I have another tach amp going bad in my 300SD. I recall seeing some >discussion here about how to maybe salvage this one, before buying a [quoted text clipped - 5 lines] > >TIA! It's not a question of the pins not being clean, it's that they don't make enough contect. You unscrew the barrelpull up (very) hard, stick a small rock in there and put it back and that "fixes" it for some period of time ranging from 6 months to 3 years. I'm assuming the 116 tach am is the same a the 126 but I relaly don't know. http://articles.mbz.org/electric/300tachamp/ Has the pics of how to do it. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > In article <1181578805.283806.291...@m36g2000hse.googlegroups.com>, > [quoted text clipped - 17 lines] > > Has the pics of how to do it. The directions say to: "It's really easy to fix though, you just unscrew it, then pull off the top (that can be kind of tough, just pull); once you have it off, remove the tach amp from inside the casing" But, did they change the design of these? The problem is how do you remove the electronics from inside the top of the cap? The part with the electronics and pins is floating/turning in the top of the cap and I don't see what holds it in or how to pull it out from the top of the cap. > -- > Need Mercedes parts? http://parts.mbz.org > Richard Sexton | Mercedes stuff:http://mbz.org > 1970 280SE, 72 280SE | Home pages:http://rs79.vrx.net > 633CSi 250SE/C 300SD |http://aquaria.nethttp://killi.net >But, did they change the design of these? The problem is how do you >remove the electronics from inside the top of the cap? The part with >the electronics and pins is floating/turning in the top of the cap and >I don't see what holds it in or how to pull it out from the top of the >cap. I dunno if they change dit or not. I don't think so but looking up bothpart numbrs would probably give you an authoritative answer. It is, in technical terms "a bitch" to remove it. I used needle nosed pliers. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > In article <1181606557.185455.112...@q69g2000hsb.googlegroups.com>, > [quoted text clipped - 11 lines] > > -- But what do you grab hold of with the needle nose pliers? Again, inside the cap is the part with the pins showing that rotates/floats inside the cap. There is nothing to release it and if you pull on it, it doesn't come out. It seems to me like it may have holding tangs/fingers that compress when it put together and then grab onto the ridge of the cap lip from behind. Meaning it looks to me like it won't come apart without breaking it. Am I missing something? > Need Mercedes parts? http://parts.mbz.org > Richard Sexton | Mercedes stuff:http://mbz.org > 1970 280SE, 72 280SE | Home pages:http://rs79.vrx.net > 633CSi 250SE/C 300SD |http://aquaria.nethttp://killi.net >But what do you grab hold of with the needle nose pliers? Again, >inside the cap is the part with the pins showing that rotates/floats [quoted text clipped - 3 lines] >the ridge of the cap lip from behind. Meaning it looks to me like it >won't come apart without breaking it. Am I missing something? Yeah that's the impression you get alright. I can't even remember if it has male or female ends. I think they're female and I used true needle nosed pliers and stuck both sides in a hold each and wiggled it till it came downa few millimeters when was able to pull it out with my fingers. Look on the bright side, it's not hard to get it back in :-) SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net |
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