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1989 560SEL
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2,103 Posts
Discussion Starter #1
a few months ago i developed a transmission leak and took my car to the shop. my mechanic replaced some stuff, but it still leaked. so back to the shop it went, and it turned into a tranny rebuild that cost me an arm and a leg. i went ahead with it b/c i knew it was coming -- the tranny was flaring between 2nd and 3rd gears a lot, and it would jerk when it had to downshift from 3rd to 2nd, especially uphill.

problem is, the same symptoms exist after the rebuild! overall, the tranny is smoother, so i believe that *something* was done to it, plus i trust my mechanic and i'm 99.99% sure he wouldn't deliberately rip me off. but if i push the car at all, the jerking is there; and if i drive nice and slow, the flaring is more pronounced. i can't win...

so my question is: is there a wear-and-tear item in the tranny that produces these symptoms? i know the modulator can cause jerking, but that was replaced a little less than 2 years ago. or is it more likely that my mechanic do an incompetent job? i've been happy with him so far, but he's not an M-B specialist.

in the meantime, my car has started leaking oil that has been diagnosed as a head gasket leak +/- a rear main seal leak. arrrrgh. these are bad days for my w126... it still drives fine, but just knowing about these high-cost repairs looming above my head is enough to ruin my enjoyment of the car...
 

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1991 300 SE
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18,534 Posts
My 500 had a 2 to 3 flare due to a vacuum leak. A new line was installed and the modulator adjusted and it’s smooth now. But I had an MB familiar indy work on it.
 

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1984 280SEL AMG
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701 Posts
You can also check the manual downshift linkage, if it's improperly adjusted can cause hard shifting at inproper times ( if it has one )
 

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Premium Member
1990 SEC
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4,104 Posts
Janos_z,

Sorry to hear that about your car.

I just had the engine on my 1990 560 SEC diagnosed with a blown head gasket. It is nasty stuff.
What tipped my mechanic off was when he pulled the dipstick and the oil appeared "milky" and "foamy". In other words; engine coolant had made its way into the oil pan.[xx(]

Which does really nasty things to all the internals of the engine because it creates sludge which gets into bearings and blocks passageways and canals.[xx(]

My engine has close to 200K so a rebuild is not a good investment. I'm looking at a replacement engine and have contacted Metric Motor, Noel's and Adsit so far. The cost of a re-manufactured engine is $5,000 to $7,500. Then you have to add about 20 hrs. or, in my case $1,300 for installation and about $400 to $600 in various parts (engine mounts, hoses, seals, injection holders, new EHA, Etc.).[xx(]

Again, not a pretty picture. The good news is that a re-manufactured engine come with a warranty, 50k miles from Metric and Noel's and 1 year from Adsit.

Courage.
 

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86 420 sel,
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162 Posts
what did he all change in your trans?
a rebuild trans should include all brake bands & all clutch packs
also there is a seal kit. now all these parts will run $900 it will not include any parts for valve body or converter, but you should get a modulator valve.
 

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1989 560SEL
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2,103 Posts
Discussion Starter #6
he definitely did the seals, but i'm getting the feeling he didn't do the rest of the stuff to save money... i'll have to ask him, although i'm not sure i'll be returning. he's in NY and i've moved to boston, and i think it's time to cut the cord. i found some M-B shops in newton that i'll be looking into and maybe one of those places can finish the rebuild my old mechanic started (or fix the vacuum leak, if that's what it is)...

as for the head gasket -- i think, so far, that it's just oil coming out, without any coolant getting in, if that can be possible. i've been taking a look at the oil dipstick and so far the oil looks clean. the garage floor on the other hand -- not so clean [:(]

axel, sorry to hear about your car's engine problems -- honestly, as much as i love my car, i'd be devastated if it cost that much to get it back into shape, and i'm not sure what i'd do. good luck -- may your actual costs far undercut the estimates!
 
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