83 300SD: Changed trans fluid/filter. Now won't go into gear. - Page 3 - PeachParts Mercedes-Benz Forum

flainn · #31 05-03-2012, 12:40 PM

Quote:

Originally Posted by tangofox007

In my experience, draining both the sump and torque converter will yield pretty close to 8 qts.

Simply running the engine will not adequately warm the transmission. You need to actually drive the car for 15 miles or so.

So it seems likely, if my figure of 1.5 gallons (6 quarts) is correct, that the transmission was still underfull when it started exhibiting the won't-go symptom.

I guess I should go buy 3 more gallons of ATF (does anyone recommend anything in particular? Does Wal-Mart's house brand suck?), drain the pan and TC once again, and put in 8 quarts and see what I get.

I'd like to warm the transmission adequately, but I've got a catch-22 problem on my hands.

flainn · #32 05-03-2012, 12:42 PM

Quote:

Originally Posted by rs899

^^ so, if I do all the math, you are 2 quarts low. That's your problem, lady.... (maybe , if you are lucky, and you haven't burned something else up in the meantime)

If I'm a lady, we've got bigger problems to worry about!

rs899 · #33 05-03-2012, 12:44 PM

^^ Just an expression. Just go put back in 1.5 quarts and see if it goes. If it goes, drive it carefully some to heat up the fluid, then check the stick and add to the mark.

flainn · #34 05-03-2012, 12:48 PM

Quote:

Originally Posted by rs899

^^ Just an expression. Just go put back in 1.5 quarts and see if it goes. If it goes, drive it carefully some to heat up the fluid, then check the stick and add to the mark.

I'll give that a shot tomorrow night and report back.

tangofox007 · #35 05-03-2012, 12:49 PM

Quote:

Originally Posted by flainn

I'd like to warm the transmission adequately, but I've got a catch-22 problem on my hands.

There is a cold check procedure. At 86*F, the max level (full) will be 5mm below the MIN line on the dipstick. (Fluid needs to be at 176*F to use the marks normally.)

The owners manual specifies 6.5 qts for a fluid change. (That said, I typically drain about 7.5 qts.)

rs899 · #36 05-03-2012, 12:59 PM

"Initial fill is 7.3 litres" meaning dry TC which gets close to 8 quarts per the Service Manual I am looking at.

barry123400 · #37 05-03-2012, 04:00 PM

Quote:

Originally Posted by flainn

Yes. The speedometer climbs (in jumpy fashion) when I have it on the ground and in drive, and rev up the engine.

It may have been 1st to 2nd; I am not entirely sure. Regardless, though, I've wound it up just the same way many times and never heard the tires chirp during a shift before. It didn't seem like a particularly hard shift, either.

This is interesting. Unless the speedometer movement is being caused from vibrations. Usually the speedometer feed is off the final output shaft of the transmission. If the final transmission shaft is turning the speedometer will read miles per hour.

Another quick check is to get a helper and see if the driveshaft is turning with the wheels on the ground and car in drive. Use a mirror on a long stick or some method to avoid getting under the car during this test.

The tires have to remain on the ground. You do not really have to rev up the engine much for this test. . Hopefully otherwise it is just a situation where you do not have enough fluid in there to allow the transmission to engage.

whunter · #38 05-03-2012, 05:05 PM

Quote:

Originally Posted by flainn

Shifting into forward gears produces the same result. Faint clunk from the rear, and the car won't go anywhere at all, regardless of RPM. But in forward gear, if I wind it up past about 2000 RPM, the speedometer starts to jump up to about 40 mph, then back to zero when I let off the accelerator.

Your diagnosis is done.

If the speedometer is reading = the final drive is spinning, but the output flange is not.

Item# 584.
Item# 841.
http://www.ganzeboom.net/images1/ganzeboom/parts/Mercedes/722.3,%20722.4.pdf

.

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Quote:

Originally Posted by Diesel911

I vaguely remember some one having the Yoke on the Out Put Shaft come loose or being stripped out with similar symptoms.
If the Speedo Needle was moving I am guessing there must have been Transmission movement up to that point inside of the Transmission.

While you are under there checking to see if the Filter you installed is OK see if there is anything else in the Drive Train disconnected.

This issue is becoming more common.
Bad 722.xxx-transmission output flange spinning on shaft

http://www.peachparts.com/shopforum/diesel-discussion/301813-transmission-problem-fix.html

http://www.peachparts.com/shopforum/mercedes-parts-reference-library/301849-output-flange-722-xxx-transmission.html

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flainn · #39 05-05-2012, 03:16 PM

Quote:

Originally Posted by whunter

Your diagnosis is done.

If the speedometer is reading = the final drive is spinning, but the output flange is not.

Item# 584.
Item# 841.

whunter: I've got a spare output shaft yoke, since I have a parts car. But I can't get it off the car, since the output shaft still has the original four-point locknut on the shaft.

Where can I get the correct socket to remove that nut?

whunter · #40 05-06-2012, 01:55 PM

Quote:

Originally Posted by flainn

whunter: I've got a spare output shaft yoke, since I have a parts car. But I can't get it off the car, since the output shaft still has the original four-point locknut on the shaft.

Where can I get the correct socket to remove that nut?

I take it off with a chisel, it is not re-usable and has been superseded by the twelve point nut..

915-0107... GROOVENUT SOCKET-TAIL FLANGE $ 83.46

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flainn · #41 05-07-2012, 09:57 AM

Quote:

Originally Posted by whunter

I take it off with a chisel, it is not re-usable and has been superseded by the twelve point nut..

915-0107... GROOVENUT SOCKET-TAIL FLANGE $ 83.46

.

Hrm. I decided to just go ahead and pull the transmission from my parts car. A lot of work just to effectively get a nut and yoke, but then again, this transmission has 80k fewer miles than the one that's misbehaving.