BenzWorld Junior Member
Date registered: Nov 2010
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w108 auto transmission rebuild
Hi all, I have searched on this subject and haven't had much luck. I am contemplating undertaking a DIY rebuild of my 1971 280s auto transmission which packed up on me earlier this week.
I am no stranger to a engine rebuild and other extensive restoration and rebuild work, but have never opened up an auto box before.
I am looking for resources, printed, online or otherwise and someone who has done this before who might be able to guide me, or put me off altogether.
Is this a fairly straightforward auto box? Can I expect to order my parts, dissasemble, clean, replace, rebuild and re-install or are there some tricks to this that mean I should steer clear.
Since more is always better when it comes to info. Here's the situation, in case a full rebuild is not necessary.
I've only had the car for two weeks, my first Mercedes, and my first auto. I have noticed the past days driving that normally my oil pressure gauge is pegged at 3. I assume this is normal, I have no idea. Anyway, this particular day I notice it's dropping slightly at idle, a little lower every few times I inch forward in traffic but comes up full when I move. This worries me, and I decide ok, if I can make it a mile I can stop at a garage.
Well, I hardly made it around the corner of the intersection before a loud thump sound, one I can feel, and then no power, as if it's just been dumped in 4th or I don't know what. I pull over immediately and switch off the ignition thinking I just blew the motor.
I had the car towed home and called one of our Mercedes specialists here in Cape Town. I explained the situation and he asked if I have tried to turn the motor over since then. I say no, but I go out and crank it. It fires immediately to life, full oil pressure, and I sigh in relief that the thump was transmission not engine.
I call them back, ok, engine runs as normal, now they ask did I try to move the car, but no, of course I didn't shift it out of park. So I go back and now it won't even turn over at all, as if seized.
So, my assumption is that whatever is wrong with the transmission is stopping the engine from turning, but the engine is probably still fine, it did run no problems just before I tried for the second time.
I'm also assuming a 40yr old automatic needs a full rebuild regardless of if this is as serious as I assume it is or not.
Any help, wisdom, insight is appreciated.