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  #46  
Old 06-17-2015, 01:03 PM
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If you're concerned about how soft the shifts are then it may be time to get out a pressure gauge and make sure the modulator is set correctly.

Glad to hear about the success, hopefully it lasts
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  #47  
Old 06-17-2015, 01:36 PM
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@Dude99
Yes, that was going to be my next step. The shifts are quite comfortable right now, but from what all I've read that should not be the case.

So yep, next step is to check the pressure etc. I've got some reading up to do on that first, though.
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  #48  
Old 06-17-2015, 01:46 PM
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Quote:
Originally Posted by Ceristimo View Post
@Dude99
Yes, that was going to be my next step. The shifts are quite comfortable right now, but from what all I've read that should not be the case.

So yep, next step is to check the pressure etc. I've got some reading up to do on that first, though.
The neck snapping "shift like you mean it" should not happen.

This is a Mercedes - a thing of bizarre geekish beauty - it is a luxury vehicle - in a bizarre geekish kind of a way - it is meant to shift smoothly. If you adjust it so that it bangs into each gear you will wear it out quicker and cause damage to your drive line too...

...whilst the 722.3 is a bit tougher this is most certainly the case for the splined shafts in the 722.0/1 transmissions which have a nasty tendency to give up...

[RANT]

...don't fall into the trap of the "they all do that advice" just because someone has only ever seen W123 diesel engine oil that you could spread on the ceiling and it won't drip off does not mean it is meant to be that way - just because some people drive with a neck restraint in their W123 diesel does not mean that's how Mercedes intended it to be - just because "they all clang and clack" it does not mean it was meant to be that way...

[/RANT]


So long as the transmission shifts like it has purpose and does not hesitate then it is probably closer to how it should be than it was before.

Drive it for a bit and see if some thing else starts to happen

If nothing happens in about 200 to 500 miles think about sourcing a pressure gauge to see if the pressures are actually where they should be.
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  #49  
Old 06-17-2015, 01:47 PM
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...oh and if you want data on when the shifts should happen - ask
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!

Don't leave that there - I'll take it to bits!
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  #50  
Old 06-17-2015, 02:02 PM
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@Stretch
Hahaha, you made me spew my coffee all over my keyboard with your "oil on the ceiling comment".

Transmission certainly shifts with purpose, it's not flaring or slipping, it's just not...ya know, "banging abruptly" into gear like it used to. I thought they were supposed to shift to an almost uncomfortable degree, but like you said: don't fall into the trap of the "they all do that advice.

Sure, I'd like data on when the shifts should happen.
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Betsie: 1984 W123 300D (hobby, 280k miles)
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The Turd: 2007 Toyota Camry (wife's car, 118k miles)
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  #51  
Old 06-17-2015, 02:19 PM
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The K1 and K2 accumulators control shift engagement. They work like a manual clutch pedal...if you snap your foot off the clutch, it grabs. If you ease it off too slowly, it slips. The idea of the K pistons is that the spring and piston work together to control the time it takes to for fluid to fill the clutch pack. I actually don't see the spring in your photos...just the piston. Did you inspect the spring? I'm not sure about the hole, it seems odd, but maybe not. There are photos of some springs and pistons in the attachment.

The condition of the K pistons generally won't completely prevent a pack from filling. Since you're getting better engagement it's probably due to the fluid or additives. Either the level was low or the additives have swelled the seals.
Attached Thumbnails
Lost 4th gear....-k1k2pistons-springs.jpg  
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  #52  
Old 06-17-2015, 02:43 PM
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Here's a link containing quite a lot of the FSM data

DIY W123 Transmission Diagnose and Adjustment 722.xx OM 616-7 - Mercedes-Benz Forum

Make sure you look at the correct data for your transmission type - don't get confused by the masses of information in that thread.
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1992 W201 190E 1.8 171,000 km - Daily driver
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1965 Land Rover Series 2a Station Wagon CIS recovery therapy!

Don't leave that there - I'll take it to bits!
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  #53  
Old 06-17-2015, 02:45 PM
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2x on Stretch's ''The neck snapping "shift like you mean it" should not happen.''

Think quality, think Rolls Royce...Bently... Benz... smooth and solid shifts
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  #54  
Old 06-17-2015, 04:23 PM
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My '79 300CD had snappy engagement out of the showroom. No adjustment could make it buttery smooth, certainly nowhere near as smooth as the GM hydramatics used in the contemporary Rolls. I was under the impression that all the early 123's were a bit abrupt, and Mercedes later changed the composition of the friction elements for the later cars.
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