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#1
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barely any reverse
i have a 1976 240d (w115) with an automatic and this morning i go to back out of my garage and there is barley any reverse. it just kind of idles backwards. it has been starting to leak fluid (a drop about the size of a dime every day) so i made sure i topped it off but still the same thing. so what do you guys think? time for a new tranny or could it be some king of adjustment? i live on the sf peninsula. any one have an idea on who i could see to check it out?
thanks, john |
#2
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Look up reverse band adjustment.
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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 |
#3
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Yup.
Read up on the reverse band adjustment for the 722.1xx trannys. As for who I would see... look no farther than your own right hand (or left, if that's what works for you).
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#4
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barely any reverse
thanks, i'll give it a try tonight.
john |
#5
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You might check to see if the bushings are intact between the shift lever and transmission. If they are gone it won't engage well.
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#6
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so i get home, jack the car up, find the adjustment nut covered in grime and boy is it loose. even the locking nut is backed out. i tighten it by hand until the locking nut bottoms out and give it a 1/4 turn for good measure but then i start to think "how do i know where it should be since everything has been backed out" can i tighten it too tight? and oh yeah how the hell do you get a wrench on the locking nut? it seems like it is too close to a rib on the trans on one side and linkage on the other? maybe that's why this thing seems to back out.
john |
#7
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In my limited comprehension of automatics. Yes you could get it too tight. Then the band would not release totally by the solinoid. You want it adjusted so the band is loose when the solinoid is off and tight enough not to slip when the solinoid is on. I suspect the adjustment just lengthens or shortens the effective circumferance of the band.
Again I would suspect if it engages reverse and seems to have normal reverse function then the band is tight enough. Tighter than that may set up an unwanted parasitic drag situation when the reverse solinoid lengthens the band when it is off. Or even cause excessive wear of the band. Since I know nothing about automatics I would try to get hold of an article of how to set it up properly or talk to an automatic transmission guy. Allow that I basically know for practical purposes nothing about automatic transmissions. Or wait awhile and see if one of our more knowlegeable site members posts with accurate information. If for example the locknut backed off more than a little. When you tightened up to the screw at that point you may have been too tight. Plus you added a little more tension. Now if the nut stopped backing out and the adjustment screw just continued to back off you are probably pretty close now. That is the most probable senario in my opinion. |
#8
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Quote:
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#9
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In one of the more recent threads (about a year ago) the adjustment spec was discussed, but it didn't really make a lot of sense (IIRC). I think what you did sounds about right. See if you can tell from the grime marks where the original setting was and go there plus a bit to compensate for wear I think that should do.
On the 240D , you may be able to remove the battery and lean in for better access to this area. You didn't confirm that it was working now...is it?
__________________
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#10
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it works. the car does go backwards and there is no lag when it engages reverse. i'll fiddle with it a bit more to see if i can dial it in better.
thanks for all the help. john p.s. i took a quick look on craigslist http://sfbay.craigslist.org/eby/cto/1053605228.html http://sfbay.craigslist.org/nby/cto/1052088849.html |
#11
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John,
Glad to hear you got it working. One word of caution, though, if it is working good, don't tighten the band any more, if you get it too tight you can cause more problems. |
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