got some problems with my tranny on my 83 300SD. when the transmission
fluid is cold it will flare on the 2-3 and 3-4 upshift. it will also
make a loud clunking noise when downshifting 4-3,but only when cold.
it shifts perfectly once the tranny fluid is hot. the modulator has
been replaced and the tranny fluid changed every 20,000 miles.
modulator pressure is set according to specs. i was considering
inspecting the B2 piston to see if that was the problem. any
suggestions will be appreciated
1983 300SD 331,000 miles
P.S. the transmission has about 80,000 miles on it since rebuilt.
Pull the vacuum line to the tranny and drive it. Does it flare now?
If so, then your vacuum control valve atop the IP needs to be
calibrated or replaced.
Loud clunk on downshift, especially if it
happens sometimes is a sign of not enough vacuum.
So, it sounds to me like you have too much vacuum sometimes and
not enough at others. I'd check out your VCV and vacuum source.
Usenet special: on cases of any filters for BMW: http://u.bmwz.org
http://www.mbz.org | Mailing lists: http://lists.mbz.org
firstname.lastname@example.org (Richard Sexton) wrote in message wrote:
thanks for the reply. it will flare with the vacuum line off too, but
only when the fluid is still cold. i haven't checked the VCV valve
yet, but i was thinking that because it only flares with the tranny
fluid cold that the problem was not vacuum related (bad servo or
piston). i'll check out the VCV and let ya'll know
It could be a vacuum leak. Check the hose which rises from the top of
thevacuum pump on the front of the engine. It feeds an "H" shape rubber
divider. remove the two hoses from the left side and plug the fitting with
two wood golf tees.If the tranny shifts better and the car runs better, you
hav a leak soomewhere. You won't hurt the car by bypassing the unnecessary
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.