transmission update
Rennlist Member
Joined: Jul 2008
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From: NW Arkansas
+1 for Greg and his willingness to share transmission knowledge. Even though I could most likely complete a successful trans rebuild I'll send mine to Dr. Brown when the time comes. The benefit of his experience is IMHO priceless.
Mike
Mike
Rennlist Member
Joined: Jul 2008
Posts: 2,288
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From: NW Arkansas
There isn't a tool I'm aware of (other than a good old vacuum gauge to check the vacuum signal from the engine) that plugs into the modulating pressure valve and reads internal fluid pressures. You need a set of pressure gauges like
to read the Modulating, Control (operating) pressure, and Governor pressures. Per the WSM, no up-shift is either an issue with the governor or the valve body. You can pull the governor with minimal loss of fluid. You will most likely need a new o-ring for the governor cover. The governor can be removed and serviced with the trans installed in the car.
Mike
Mike
Nordschleife Master
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Former Vendor
Joined: Feb 2005
Posts: 15,228
Likes: 2,530
From: Anaheim
The Mecedes "tool" is a set of gauges, so that you can see system pressure and modulator pressure, at the same time.
I believe that my "official" gauge set came from Baum Tools.
You might want to note that system pressure is a "fixed" value and governor pressure is a function of modulator pressure and throttle posistion (thus not adjustable). The only thing that you can change is modulating pressure.
If all you want to do is check the modulator pressure, I make up two different single gauge "kits" with the appropriate adpators (that I offer with a rebuilt transmission...or when someone changes a modulator)), that thread right into the port and read modulator pressure only. The hose is long enough to reach inside the car, from the underside, so that you can go drive around and check/set your modulator pressure. The gauges are fluid filled, to "dampen" the vibrations and slight pulses. The difference between the two different "kits" is the quality of the gauges. One has a basic 0-100 gauge (and you can pin it and ruin it, if there is something really wrong), for the "home guy" and is $99.95. The other is a much more robust (larger and more accurate 0-200 psi) gauge, for more frequent use (and tougher to pin and ruin.) It runs $169.95.
Makes setting the modulator pressure, initially, much easier.
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Thread Starter
Rennlist Member
Joined: Jul 2012
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Update:
Today it was to cold to pull off the governor.
In Park the vehicle is parked, in neutrol I can lightly press the gas to make it go forward.
Reverse does not engage.
In the selector 2, 3 and Drive will only put me in second gear.
Before I remove the bowden cable and kickdown solenoid relay it would go into reverse (i think this is another problem then the shifting) and stay in 2nd, but it would flare and not upshift.
Today it was to cold to pull off the governor.
In Park the vehicle is parked, in neutrol I can lightly press the gas to make it go forward.
Reverse does not engage.
In the selector 2, 3 and Drive will only put me in second gear.
Before I remove the bowden cable and kickdown solenoid relay it would go into reverse (i think this is another problem then the shifting) and stay in 2nd, but it would flare and not upshift.
Nordschleife Master
Joined: Feb 2011
Posts: 8,199
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His problem is different than yours. You probably have a linkage problem. His is likely the regulator, pump, or valve body.
Thread Starter
Rennlist Member
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can any one explain this better, the manual says to put the car in N then unplug the shifter cable on the transmission, then move the selector to neutrol and reattach cable. how do I know when the selecter is in neutrol?
Race Director
Joined: Sep 2007
Posts: 12,162
Likes: 383
From: Johnson City, TN
As I said earlier, those that know will not share.
Its a void we will fix in the next year or so I suspect as more fail.
Same as the Mercedes of same era.
Mercedes holds its tech information closely.
There are some videos, though, that might help, for them.
They are not very special inside, BTW, and we will as a community solve it once we focus.
Its a void we will fix in the next year or so I suspect as more fail.
Same as the Mercedes of same era.
Mercedes holds its tech information closely.
There are some videos, though, that might help, for them.
They are not very special inside, BTW, and we will as a community solve it once we focus.