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#1
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Tranny almost skipping 3rd / shifting to 4th early on '85 300D
I've been having this problem for quite some time now, the tranny in my '85 300D likes to almost skip 3rd gear on anything other than hard acceleration. It likes to just spend a split second in 3rd before going to 4th. I've got the bowden cable adjusted to spec but but it still does it. The only way really to keep it in 3rd is to put it in "S" and then shifting it to D when starting out.
This problem's got me worried.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#2
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I have the same problem - for me it is not the cable. (85 300TD Ca) - I was told possibly the valve body or the governor. I am talking to a mechanic. Let you know what I find out.
Steve |
#3
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Occasionally on my '85 too
Does yours do this under light acceleration? When you give it a little more pedal does it shift out correctly?
I have a slight hill after I turn out of my neighborhood and when I take off rather slowly my '85 will almost skip 3rd. But when I need to move on with the traffic it goes through the gears precisely as it should.
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Rick Avid Benz watcher Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL, Previously owned 123's: 1978 300D, 1983 240D, 1985 300D Previously owned 124: 1994 320TE Currently: 2004 Toyota Sequoia SR5 206k 2010 Ford Edge 122k Always looking for the next MB diesel! |
#4
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I have to push the pedal at least past half way if not nearly to the floor for it to shift right(?). It will downshift without too much trouble if it's in 4th.
Mine is also a CA model.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#5
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Mine was doing EXACTLY the same until about 2 weeks ago.
I installed a K1 accumulator spring kit. It cost $10.50 at the dealer. Part# 126 270 44 77. See my thread: http://www.peachparts.com/shopforum/showthread.php?t=118941&highlight=spring+kit
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
#6
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Saw your thread and read this article...
Good job on the K1 replacement. I found this http://transmission.articles.mbz.org/k1/
article most informative as well. RP
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Rick Avid Benz watcher Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL, Previously owned 123's: 1978 300D, 1983 240D, 1985 300D Previously owned 124: 1994 320TE Currently: 2004 Toyota Sequoia SR5 206k 2010 Ford Edge 122k Always looking for the next MB diesel! |
#7
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Thanks for the good news. It's the kind I like, cheap and easy to fix.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#8
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Vacuum adjustment
I was wondering how to adjust the vacuum to the transmission. I know that there is an adjustment on the IP that regulates the amount of vacuum but which way do you turn it to adjust it for more vacuum?
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#9
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Great tranny article
Read up on MB trannys and their myriad of adjustments:
http://users.vnet.net/w123d/w123d/transmission.htm RP
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Rick Avid Benz watcher Previously owned 126's: 2 1981 300SD's, 1987 300SDL, 1991 350SDL, Previously owned 123's: 1978 300D, 1983 240D, 1985 300D Previously owned 124: 1994 320TE Currently: 2004 Toyota Sequoia SR5 206k 2010 Ford Edge 122k Always looking for the next MB diesel! |
#10
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Trani switch fixed mine
Did a re & re 3.07 out, 2.88 in. The correct load on the trani against governor pressure makes the shift perfect. I love it.
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#11
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I was wondering how in the heck can you adjust to vac modulator on the tranny with it in the car. I've been under it and it looks like there's no way to get to it w/o dropping the tranny down.
I've read somewhere that you can make an adjustment to regulate the vacuum to smooth out that 1st to 2nd shift by simply turning the adjustment on the vacuum bleed valve. I can't find that thread or post anymore. The search option SUCKS.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#12
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Quote:
Then often someone elects to follow bad advice and never posts the end of the problem so the thread reads like the bad advice was the solution to the problem. |
#13
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mine does the same thing, but with 2nd instead of 3rd.
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1985 300D Turbo "Eunis" |
#14
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The SD used to do this too until I played with the ALDA and got the boost back up to spec. Also make sure you check your linkage for full throttle movement. The last little bit makes a huge difference in movement for the IP
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#15
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My car does the exact same thing even with the K1 replacment.
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