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#1
02-18-2009, 03:51 PM
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300sdl trans flare 2-3 upshift
ok ive been reading on here for a long time and have done some of the vacuum testing. my trans only flares on the 2-3 upshift other than that its fine. it seems to shift fine at full throttle only flares under light to moderate shifts. my modulator is holding vacuum, plugged the egr, my vcv has about 13" at idle 0 at full throttle. what would my next step be?
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#2
02-18-2009, 04:59 PM
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do a search on K2 spring replacement --- I think there is a DIY article. I have it on my list of things to do to Coda.
__________________
daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior No longer selling Cluster Needles Paint No longer selling New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more
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#3
02-18-2009, 05:03 PM
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Quote:
I'd make a small adjustment to the vacuum amplifier (blue flying saucer). Remove it and you'll find a black plastic cap on the bottom. Remove the cap and you'll find a plastic hex screw..........4mm IIRC. Turn the plastic hex screw clockwise by two turns and reinstall the amplifier in the vehicle. Reconnect it and take it for a drive. See if the flare is gone.
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#5
02-18-2009, 10:16 PM
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Quote:
Help is what we do here.
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#6
02-18-2009, 11:20 PM
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Quote:
__________________
daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior No longer selling Cluster Needles Paint No longer selling New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more
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#7
02-18-2009, 11:30 PM
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I was considering replacing the 123 unit... I didn't know it was adjustable...
-Jason
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#8
02-18-2009, 11:39 PM
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Quote:
Which vehicle? What issues?
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#9
02-18-2009, 11:50 PM
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The blue and white saucer, in all the vacuum diagrams it's always number 123, and mine has 123 printed on it, even though it's part number starts with 126.
On my 350SDL shifts are always too firm, even after adjusting the modulator on the injection pump. Unplug the boost line going to the 123 unit and then shifts are way too soft. -J Last edited by compu_85; 02-18-2009 at 11:55 PM.
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#10
02-19-2009, 12:01 AM
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Quote:
There is no "modulator" on the injection pump. The IP has the vacuum control valve (VCV) attached to it. Get a reading of the vacuum at idle from the VCV output to the amplifier. Get another reading at idle from the amplifier to the modulator (transmission). My suspicion is that you've got a vacuum leak.
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#11
04-05-2009, 11:15 AM
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EPCnet Online the official Mercedes-Benz USA, LLC site for hosting spare parts documentation for Mercedes-Benz cars and light trucks sold in the USA seems to designate it as the "PRESSURE CONVERTER". Item no. 941 Part number
A 123 300 11 33. In case someone is getting blank stares at the parts counter. One wonders if a retrofit of this item on pre '85 diesels is doable and worth the trouble.
__________________
'83 SD, 2x '85 SD You are entitled to your own opinions, you are not entitled to your own facts.
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#13
04-05-2009, 12:36 PM
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This question is for our 300SDL: dose that blue flying saucer adjust shifitng smoothness...Mine kind of knock in at low rpms, we a adjusted the T key under the tranny (it did improved a little), the cable adjuster (white plastic hex bolt) and it still shift hard...
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN  1995 E320 SE 220k mi 1984 300SD 350k mi
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#14
04-05-2009, 12:55 PM
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The blue saucer should adjust firmness of all shifts. If the 2-3 shift flares and the rest of the shifts are good, I'd go for the K2 spring kit, right around $8 from Mercedes and adds about 10minutes to a filter change.
__________________
 Gone to the dark side - Jeff
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#15
05-31-2009, 12:05 AM
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I did some reading in the FSM and online, THIS page was helpful. First I checked all the vacuum lines. One of the ones at the VCV was a little tired looking, but replacing it made no change. Next I checked the VCV, which was set wrong. Per the FSM I held the throttle totally open then adjusted the VCV until I felt resistance. Then I adjusted the modulator on the transmission. Several test drives and modulator adjustments later everything is perfect: at low loads you can't even feel the shifts, under maximum load it shifts crisply without banging into gear or jarring the passengers.
I didn't make any changes to the boost transducer. Appreciate the terminology help Brian  -Jason
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. Last edited by compu_85; 05-31-2009 at 12:55 AM.
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