|
|
|
|
|
#1
03-20-2013, 02:35 PM
|
|||
|
|||
|
76 300D Transmission shift issues
Can anyone tell me if the transmission in my 76 300d can be adjusted. It delays in all gears. When the car warms up it shifts like it is supposed to however I noticed when driving on the expressway it starts hunting gears at around 55-65mph. Is there any kind of adjustment that can be done? Car used to be in pristine condition until my dad let it sit for a number of years. I want to be able to drive it may 2-3 times a week to get out of my acura mdx.
__________________
1972 220d gone lived a good life 1972 280se gone but not forgotten 1978 300D the best i ever had 1977 350se speed racer gone 1995 honda accord lx coupe victim of the growing family 1988 300e gone but not forgotten 
|
|
#2
03-20-2013, 03:29 PM
|
|||
|
|||
|
jc:
First things first; you may or not be aware that the transmission is actually a four-speed trans (722.1xx)(W4B025) that normally starts in 2nd gear, although a full throttle start w/kickdown will force a 1st gear start. The shifting delay when cold, and the 4-3-4 hunting at 55-65 mph suggest a problem with the governor (sticking), or a leakage of governor pressure. This comment does assume that the fluid level is correct. Since the car has been out of service for a while, a change of fluid and filter would be in order as a first step. Other possibilities include intermittent activation of the kickdown switch, and mis-adjustment of the throttle pressure linkage to the trans.
|
|
#3
03-21-2013, 02:40 AM
|
||||
|
||||
|
Assuming you have have clean fluid and the correct amount, clean filters etc and a 722.118 with the throttle connection (rather than vacuum only) - I'd start by checking the throttle bushings.
And to answer the question - yes it can be adjusted. If you have the transmission I think you have there is adjustment at the throttle linkage and at the back of the transmission where you can change the modulating pressure. Start with the throttle though. To adjust the modulating pressure you need gauges.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
|
|
#4
03-24-2013, 12:56 PM
|
|||
|
|||
|
I had this take place on a 1975 230 (gas) and a 1978 240D. Both times it was a bad vacuum modulator.
These are cheap and easy to replace. Then they are very, very difficult to adjust and like Stretch said you will need a set of gauges. You might just want to take it to a shop that deals with Mercedes transmissions. It could be the cheapest route in the long run.
|
|
#5
03-24-2013, 03:39 PM
|
|||
|
|||
|
[QUOTE=Pooka;3119353]I had this take place on a 1975 230 (gas) and a 1978 240D. Both times it was a bad vacuum modulator.
jc: Re: The above quote from Pooka Both of those transmissions are equipped with vacuum modulators. The trans in the 76 300D is not; There is a fixed pressure plug installed where there would otherwise be a vacuum modulator.
|
 |
| Bookmarks |
| Thread Tools | |
| Display Modes | |
|
|
Linear Mode
