Slipping auto transmission
12-05-2004, 03:21 PM
#16
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Originally Posted by Doug Hillary
Hi Dave,
what we both (Fogey1 and I) said is that commercially flushing any Auto transmission can lead to serious problems. There is considrable evidence supporting this
Draining and refilling should not be confused with "flushing"
Probably just confusion over terminology
Regards
Doug
what we both (Fogey1 and I) said is that commercially flushing any Auto transmission can lead to serious problems. There is considrable evidence supporting this
Draining and refilling should not be confused with "flushing"
Probably just confusion over terminology
Regards
Doug
12-06-2004, 05:51 PM
#17
Burning Brakes
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Hi,
Scott - I think that may be the presurised filling device. The commercial flushing process is somewhat more aggressive and like many such things, dependent on the skills of the Operator
ATF's are very sensitive and complex fluids - most are semi-synthetic. They are NOT overly detergent in their action and depend on the filter to remove wear contaminants. Of course there are no products from combustion etc but heat destroys their effectiveness. Fully synthetic ATFs can reduce operating temperatures by up to 20C prolonging component and ATF life
I have not seen a Porsche or MB reference to a "commercial flushing" routine in service documents
Dave - thanks, we are all on the same "Bondi tram" - great stuff
Regards
Doug
Scott - I think that may be the presurised filling device. The commercial flushing process is somewhat more aggressive and like many such things, dependent on the skills of the Operator
ATF's are very sensitive and complex fluids - most are semi-synthetic. They are NOT overly detergent in their action and depend on the filter to remove wear contaminants. Of course there are no products from combustion etc but heat destroys their effectiveness. Fully synthetic ATFs can reduce operating temperatures by up to 20C prolonging component and ATF life
I have not seen a Porsche or MB reference to a "commercial flushing" routine in service documents
Dave - thanks, we are all on the same "Bondi tram" - great stuff
Regards
Doug
12-07-2004, 12:12 PM
#19
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Originally Posted by Wolvreen
With a possile danger of some clear communications, can someone pease explain properly what a commercial flush is?
12-11-2004, 11:48 AM
#20
Racer
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Wally and Tony,
It was the modulator - fluid level was a bit high but sucking some off made no difference to the slip when changing gear. Next I tried 3 turns (clockwise) on the handle of the vaccum modulator and I can't belive the difference - no slip, and crisp, smooth and timely changes. Whole car feels more eager! Does this suggest I have got a leak somewhere in the system - or is it likely to be a one off adjustment.
Thanks
Mark
It was the modulator - fluid level was a bit high but sucking some off made no difference to the slip when changing gear. Next I tried 3 turns (clockwise) on the handle of the vaccum modulator and I can't belive the difference - no slip, and crisp, smooth and timely changes. Whole car feels more eager! Does this suggest I have got a leak somewhere in the system - or is it likely to be a one off adjustment.
Thanks
Mark
12-11-2004, 12:09 PM
#21
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Originally Posted by Drmark
Wally and Tony,
It was the modulator - fluid level was a bit high but sucking some off made no difference to the slip when changing gear. Next I tried 3 turns (clockwise) on the handle of the vaccum modulator and I can't belive the difference - no slip, and crisp, smooth and timely changes. Whole car feels more eager! Does this suggest I have got a leak somewhere in the system - or is it likely to be a one off adjustment.
Thanks
Mark
It was the modulator - fluid level was a bit high but sucking some off made no difference to the slip when changing gear. Next I tried 3 turns (clockwise) on the handle of the vaccum modulator and I can't belive the difference - no slip, and crisp, smooth and timely changes. Whole car feels more eager! Does this suggest I have got a leak somewhere in the system - or is it likely to be a one off adjustment.
Thanks
Mark
I dont think it is a leak in the "vac" system as removing the line comletely and capping it would default the tranny to the "firmest" shift it could give. Odds are that adjustment has never been touched in the life of your car so perhaps over time it just needed re-adjusting as things wear inside a bit? Im not really sure. thats just an idea.
10-19-2009, 04:59 PM
#22
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I have a question for any Auto-trans gurus out there. Therre are a couple of references in this thread to turning the modulator adjustment three turns clockwise. Is this really a reasonable amount to adjust when trying to help a trans that slips a bit between gears (more on the 3-4 shift than the others) I followed the directions, and turned my modulator adjustment one half turn, and the 1-2-3 shifts are nice and crisp, a definite improvment, still a bit slippy on the 3-4 shift. I do not possess a pressure gauge, so I am trying to get it right by road testing.
Any help?
Any help?
