Tachometer Issues -- W123, W126, W116 Turbo Diesel Mercedes

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[@cjp28]

Badass! Thank you

[@w124mercedes7]

What a fantastic car. Looks great. What causes the 1987 300d tach not to work.

[@MrGwinn]

Mine is works only sometimes... What is the trick with the penny/quarter you mention?

[@danyalybrownrice7841]

Great info! My experience is 9 out of 10 times the tach amp is bad. Putting pressure on it and messing with it only works for a couple days/weeks. I agree the gummy stuff is horrible and is barely good decades later. I actually found a new VDO amp once on Ebay for $130. Avoid used ones if possible. Also grounding issues can cause tach problems if I'm not mistaken

[@mercedesclassicswithpierre1753]

have you ever opened up the tach amps and replaced the capacitors?

[@w124mercedes7]

Pierre is a real wealth of knowledge when it comes to m.b I have learned how to fix a few items from his videos.

[@zainaman710]

I have a 1994 w124 250 d. The tachometer is not working and nor is the ac blower. Need help

[@chimar0]

Yep. Got a jumping tach. Where should I look for both ends of that thing? Thanks so much!

[@mercedesclassicswithpierre1753]

at the crankshaft end, look for wear and tear on the pick up.

[@chimar0]

Roger that. Thanks!

[@AllAmericanDreamChaser]

I have a 1993 190E 2.6 liter. Reverse works, but no forward gears. I think it may possibly be the B2 piston. Anyone familiar with this and where can I find one? Thanks👍🤔

[@mercedesclassicswithpierre1753]

yes! B2 piston or brake band it is..here's the diagnosis upcouple the bownden cable from the throttle linkage put the car in drive see what happens. if it moves forward the issue is the piston. if it doesn't, the issue is the brake band itself

[@TheCamarokid1976]

I have a 1985 and don’t have the amplifier on it is this y my tack is not working?

[@mercedesclassicswithpierre1753]

your tach will usually quit working of the over voltage protection relay fails.

[@TheCamarokid1976]

The Pierre Hedary Mercedes-Benz Classic Specialist Thank you were is it located so I can replace it thank you for your help

[@mercedesclassicswithpierre1753]

@@TheCamarokid1976 on a 123 under the right side of the dash. on a 126 in the fuse box

[@lucasrojas7269]

@@mercedesclassicswithpierre1753 what do you think of a 500sec 1985 with a 617 turbodiesel swap

[@qwertyui90qwertyui90]

This one is a bit of a head scratcher. I have a brand new one i got today with 72 ohms reading. and my tach is doing this kzbin.info/www/bejne/pHPJeZ2bmc1-iNU

[@mercedesclassicswithpierre1753]

what model are you working on?

[@qwertyui90qwertyui90]

@@mercedesclassicswithpierre1753 W123 300D om617A engine :) 1983 engine

[@qwertyui90qwertyui90]

@@mercedesclassicswithpierre1753 I suspect my pickup cable is bad as it's reading a little higher resistance than you say in the video. If i remember it reads about 80 Ohms