722.1xx help in W116 needed - Page 4 - PeachParts Mercedes-Benz Forum

tjohn · #46 07-25-2007, 01:36 PM

Quote:

Originally Posted by dunl

Okay, I guess that's my first place to start looking.

Is there a linkage tutorial somewhere - I've done some searching, but haven't really found anything for the beginner DIY'er.

Couldn't have looked too hard

.

The mother of all shifter bushing write-ups just came along yesterday. Here you go.

Thomas Pindelski, an old member here, did a nice pictorial+write up on replacing these, but his site has been pay only for two or three years now. Good luck, I hope this solves your problem.

dunl · #47 07-25-2007, 09:03 PM

Thanks, I did see that...was looking for something on doing a complete check of the linkage for a tranny, what to look for, etc. instead of just how to replace the bushings (NOT that I don't appreciate that link, as there's some really good info in there.

)

dunl · #48 08-14-2007, 01:12 AM

Okay, now 8 months or so later, after selling two vehicles and buying another, plus doing a crapload of home renos and landscaping, I have time to work again on this car.

Okay, so I drained the fluid from the pan again, as I did not do the torque converter at the time. As the fluid isn't too expensive, why not, right?

Also drained the torque converter with my new 27mm socket....really easy to turn the pulley and find the drain bolt, actually. Better than playing with a starter.

So, drained them both, added Trans-X and filled with fluid. Started and filled again a few times. Tested the gears, and she still revs high, then starts to creep in all gears.

Checked the linkage below with the wife shifting the gears, and it looked like it shifts....firm, I guess? Nothing loose I can see. Flex disks look good.

Replaced the stop lever from a parts car as my rubber piece on the original fell off one side and wasn't connecting the two levers anymore. Tightened up all the acclerator linkage, including the rod that goes back across the valve cover down to the tranny.

Removed as much EGR vacuum lines as I could find, while still keeping the lines to the transmission intact. I don't have a Mighty-Vac to test these with up here in Alberta - obviously they're kept in the restricted section with the golden unicorns that I've never seen either.

I have used the suck on the line and stick your tongue to it to do an initial vacuum seal test. The line going to the tranny holds the vacuum I create quite well. The rubber connector going into that line from the IP does NOT hold any kind of a vacuum really. I've changed it with the parts car, and same thing....doesn't hold.

So, I am thinking this rubber connector from IP to tranny vacuum line might be the problem....when I put the car into gear, there is very little vacuum,so it does not move. I cannot feel it shift into gear.

However,as I increase the rpm's, more vacuum is created, slowing putting the transmission into gear, and causing it to move, but there's only so much vacuum that can be created with rpm's without redlining the engine.

Is this scenario possibly correct, or am I missing something here? If so, short of replacing the rubber connectors until I have a good seal, where do I go from here?

Thanks in advance.

sixto · #49 08-14-2007, 02:51 AM

I don't think vacuum has any effect on engaging first gear. You need a set of pressure gauges but I'd just as soon proceed on the assumption that the front pump isn't doing its job... assuming when you pulled the pan you didn't see remnants of the clutches floating in fluid.

Sixto
87 300D

dunl · #50 08-14-2007, 03:25 AM

The pan was practically clean when initially pulled.

dunl · #51 08-14-2007, 12:17 PM

Quote:

Originally Posted by sixto

I don't think vacuum has any effect on engaging first gear. You need a set of pressure gauges but I'd just as soon proceed on the assumption that the front pump isn't doing its job... assuming when you pulled the pan you didn't see remnants of the clutches floating in fluid.

Sixto
87 300D

So is this for sure a sign that my pump is shot?

rs899 · #52 08-14-2007, 12:31 PM

Dunl-

So, is this the W116 300SD you are talking about?

There have been several reports of bad pumps/TCs with the 722.120 transmission. The car I had had the fingers of the TC wedged in the front pump. You might try pulling one of the tranny oil cooler lines off at the radiator and see if you have any kind of pressure.

Rick

dunl · #53 08-14-2007, 12:38 PM

Yes, it's the w116.

Okay, I might not have time to get to it till later today, but I can check that easy (read: big mess lol).

I do have a parts car - how hard is it to switch out these pumps?

rs899 · #54 08-14-2007, 01:04 PM

Dunl-

If you make a big mess, the pump is not your problem ( be happy).

How easy to replace? It's pretty easy...once you have the transmissions out and on the bench....

Rick

dunl · #55 08-14-2007, 01:48 PM

Quote:

Originally Posted by rs899

Dunl-

If you make a big mess, the pump is not your problem ( be happy).

How easy to replace? It's pretty easy...once you have the transmissions out and on the bench....

Rick

Yeah, well if the tranny comes out, the other complete one will go in.

rs899 · #56 08-14-2007, 01:57 PM

you still may want to check its pump, and rebush the TC where it rides on the stator. That may (or may not) be why they fail with some regularity.

dunl · #57 08-16-2007, 08:23 PM

Okay, disregard my edited question of "which line".

After THAT mess, I can only hope that my transmission pump is working fine, or else they must pump something like 14,000GPH!

Hope I used enough newspaper.

Okay, so it's DEFINATELY not the pump. lol

What's next?

dunl · #58 08-16-2007, 10:22 PM

Well, replaced ALL the fittings around the IP. Drained the torque and tranny pan and replaced filter, filled with Trans-X and fluid as above, replaced the accelerator linkage, and.....

She seems to be shifting fine now. I'll know for sure when she is filled all the way with fluid, and let you all know. I may have to do some fine tuning with the shift points now that the linkage has been replaced and tightened.

lietuviai · #59 08-16-2007, 11:00 PM

I thought the 116's didn't have an egr.

sailor15015 · #60 08-16-2007, 11:19 PM

Quote:

Originally Posted by lietuviai

I thought the 116's didn't have an egr.

It shouldn't. Mine doesn't.