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#1
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1977 W123-1030 only shifts at really high RPM
i have a 1977 300D that will only shift at really high RPM and I have to let off the accelerator to let it shift. This model doesn't have the ALDA...it is all mechanical linkge from the pedal to the valve cover to the transmission. I have a mercedes cheapo shop manual and I cannot understand the steps to adjust the shifting. Is there an easier way to adjust the shifting setting? thanks -Stephen
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#2
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sorry.....
I meant to say that it doesn't have the bowden cable. from what I understand adjusting the control pressure rod adjust the shift timing. if I were to make the rod bigger would that advance the shifting or retard it? thanks- Stephen
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#3
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sounds like your talking about wht folks generally refer to as 'flaring', you will find tons of posts regarding this on the forum
__________________
1996 E300 110,000 1985 300TD 212,000 1980 300D 238,000 |
#4
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Making the control pressure rod longer will make it shift earlier assuming its misadjusted. Did this car shift fine for years then, last week act up? By 'bigger" do you mean longer? Also I've seen bushings missing on linkages either up top or at the trans affecting shift points. Also put year and type of Mercedes in your signature profile.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE. |
#5
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flaring
I understood flaring to be when the engine's RPM's rose BETWEEN shifts not BEFORE shifts. Is that correct?
stephen |
#6
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Quote:
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#7
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My 77 does the same thing when its cold. Once it warms up, the shift points move down but they are still controllable by feathering the accelerator. Mine has done this for the 6 yrs I have owned it. I believe it has always behaved this way, so yours might just be behaving normally. On the other hand, it could be a stuck kickdown switch pushing the shift points up. Unplug the kickdown shift and see what happens.
I like being able to control the shift with pedal pressure.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#8
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kickdown switch???
Quote:
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daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior Cluster Needles Paint New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more |
#9
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I had a similar problem with my 1978 300D. First shift (2-3) was late in my opinion and a little harsher than I thougth it should be. Lengthened the control rod on the passenger side of the valve cover. It's the one that disappears below manifolds. Adjusted slowly, trial and error and after lengthening about 7-8 mm the shift point was earlier and less abrupt but still firm. The 3-4 shift is fine. If I can find the thread for adjustment of these non vacuum controlled transmissions I'll post.
Kevin 1978 300D 1979 240D |
#10
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Kickdown switch and control rod
I will definatley try the kickdown switch...I know this one has it. However I dont think it is normal for this transmission to behave like this. Though your mercedes might hav done this for years, it is not normal by any means. Maybe your experiening something different than me. She will not shift unless I feather the accelerator at extremly high RPMs....i am afraid to even drive it when it is like this. thanks to all i'll try to fix it tomorrow.
-Stephen |
#11
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ive understood flaring to be high rpm's before the shift, i would think high rpm's in between the shift would be a slipping kind of deal.
__________________
1996 E300 110,000 1985 300TD 212,000 1980 300D 238,000 |
#12
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Quote:
Sounds like the high rpm's is higher than mine.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#13
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flaring?
Quote:
-stephen |
#14
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not the kick down switch
i tested the switch and it "switches" on and off fine when i was pushing it with my finger. I am going to try to adjust that control arm today....is the best way to get to it from underneath? I dont have jack handy so it makes it difficult to get to froom underneath. can I access it from under the hood easily? thanks, stephen
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#15
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Year and type of Mercedes in your profile signature please.
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE. |
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