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#1
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'81 240D 3rd to 4th shift issue
I did a search and could not find what was a definitive answer to my question.
I have an '81 240D auto and it shifts 1st and 2nd normally. Then at the proper time shifts to 3rd, stays for a second, and on to 4th. The bowden cable seems like it adjusts the shifting on all gears, I'm having problems only with 3rd to 4th. Would adjusting the bowden cable then change 1st to 2nd as well? The K-1 spring - I read some posts that said it fixed similar problems others were having and some said it had no effect at all. Am I missing something in thse posts that the more experienced can extract?
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1981 240D, Auto Trans, 160k miles -- CRASHED! |
#2
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my wifes 240 has the same problem. the indy wants to replace the vacuum valve(the white thing on the left side, rear of the engine) and the two(or is it one ?) three way vacuum valves on the valve cover. we already have replaced the modulator on the trans.
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currently [1981 300 td tdidi 165500 dark brown/palamino-Brownie-mine-3k miles of ownership 1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red the above two cars are for sale and can be seen on the cars for sale thread here. pix also available. 240d-144+ Manilla Yellow w/ palmino interior-greasecar kit-Blondie-the college kids car 23" gt 21 speed still on original tires-still got the nubs 21" khs tandem |
#3
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K-1 spring kit cures a sluggish 2-3 shift....the 3-4 shift is a B-2 piston issue...if it does it every gear you have way too much vacuum at the modulator...
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#4
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BHD - I only get the quick shift from 3rd to 4th. Is the B-2 pison a major fix that Indy needs to do or is it something I can easly do in the driveway?
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1981 240D, Auto Trans, 160k miles -- CRASHED! |
#5
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Quote:
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#6
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BHD - The shift is quick, but suttle. I can tell the shift occured by listening to the RPM and resulting loss of pick up from being in 4th too soon.
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1981 240D, Auto Trans, 160k miles -- CRASHED! |
#7
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Quote:
I'n not sure whats casuing the early 4th shift.....I misread your original post.....
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#8
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Quote:
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck. |
#9
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#10
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At the risk of disseminating false or inaccurate information, I will let you know what I found with my 240.
My shift points were all messed up after an engine change from a Euro injection pump to a NA one. To get my shift points back, I needed to adjust the screw in the modulator and all was fine again. My transmission is a 722.118 in a 1982 Euro and yours might be different, but mine doesn't have a Bowden cable and works by the shift points controlled by the modulator on the transmission and the harshness of the shift controlled by vacuum through the 3 way valve on the valve cover and the vacuum valve on the injection pump. Yours may be different. You might want to do the search for shift problems on this board and study up for a night or two because this is quite a topic, but I would check the easy stuff first and check the vacuum lines and connections. Next I would buy or borrow a Mit-T-Vac tester and check the numbers working from the vacuum modulator back through the 3-way valve to the vacuum valve on the IP. You can pick up some of the values here on the board. The vacuum from the valve on the IP should vary from high to low as you advance the throttle. The 3-way valve likewise adjusts the vacuum dependant on the linkage position. These valves frequently leak or fail causing quirky shifting. Good news is that they are cheap. If your problem is internal to the transmission, disregard everything I say because that is above my pay grade. Good Luck, Jim
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'82 240D Euro 68K and growing |
#11
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Thanks for all the replies and information. I will do more searching, I had initially just searched on SHIFT 3rd 4th.
Friday when I was driving home(lots of stop and go traffic), I made note of exactly how the shifting was acting. Shift from 1st to 2nd was harsh, whether I was on the throttle hard or easy. 2nd to 3rd was normal for the second that it remained in 3rd and easily went into 4th. When I pressed hard on the throttle, sometimes it would downshift on its own and remain in 3rd until I'd back off the throttle a little then a smooth shift into 4th. I'm embarrassed to say, I just checked the ATF after a 20 min drive. The fluid looked and smelled OK. It was about 1/2 inch over full on the stick. I checked in Park and neutral. I'm not sure what to use to pump out some of the fluid through the dipstick.
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1981 240D, Auto Trans, 160k miles -- CRASHED! |
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