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  #1  
Old 07-03-2013, 08:35 PM
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Driveshaft/transmission questions (removing engine/transmission in 1984 300D W123

1) Since I'm just pulling the tranny with the motor, do I need to back off the driveshaft? My life would be easier if I didn't have to.

2) What size are the bolts holding the driveshaft onto the transmission? How about the nuts on the transmission side?

3) Off-topic, but why not: what else do I need to do to remove my differential besides removing the driveshaft and the axles? Vstech, are you looking for rear axles?
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Old 07-03-2013, 08:40 PM
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You'll want to take off the flex disc on the outlet put shaft of the trans. It's held on by 6 bolts, one side is a large hex (8mm I think? And the other side a nut (17mm i think? Going strictly off memory). Flex disc on the white car is new so you'll want to use that one. You'll need to rotate the driveshaft to get at all the bolts, so keep that in mind before you get it all jacked up and stationary.

You'll need: Tools:
Torque wrench, 8, 13, 17, 19mm socket, 17mm wrench, 8mm Hex


From the pp wiki
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Last edited by tbomachines; 07-03-2013 at 08:51 PM.
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  #3  
Old 07-04-2013, 12:35 AM
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Quote:
Originally Posted by tbomachines View Post
You'll want to take off the flex disc on the outlet put shaft of the trans. It's held on by 6 bolts, one side is a large hex (8mm I think? And the other side a nut (17mm i think? Going strictly off memory). Flex disc on the white car is new so you'll want to use that one.
Yeah, I'm planning on using the one from the white car, but I'm thinking that it would be a whole lot easier to swap flex discs once the transmission is out of the car. Does that make sense?
Quote:
Originally Posted by tbomachines View Post
You'll need to rotate the driveshaft to get at all the bolts, so keep that in mind before you get it all jacked up and stationary.
NOW you tell me! If I back off the 41 and 46 mm nut on the driveshaft, could I turn the front half of the driveshaft with the rear wheels on the ground?
Quote:
Originally Posted by tbomachines View Post
You'll need: Tools:
Torque wrench, 8, 13, 17, 19mm socket, 17mm wrench, 8mm Hex


From the pp wiki
I missed that when flicking through the Wiki, then... what is it under? Driveshaft center carrier replacement?
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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  #4  
Old 07-04-2013, 09:57 AM
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It is possible to pull the engine with the trans together with the front drive shaft section still atached.

In other words.. Without disasebleing the front flex disk and only taking apart the drive shaft at the center.

Maybe makes it a little more tricky to pull the engine/trans. You'll have to put it a steeper angle and the front piece of drive shaft will want to hang up a bit but it's doable.

Saves just a bit of work I think. Taking apart the flex disk is not that difficult but just taking it apart at the center is much easier.
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Old 07-04-2013, 10:35 AM
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Let me rephrase this: the driveshaft appears to be attached to the flex disc/transmission by three bolts. Can I jut undo those and pull the transmission out without collapsing the driveshaft?
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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  #6  
Old 07-04-2013, 07:42 PM
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Having done this twice in the past couple of months, here's how I did it:

- Pull ALL the bolts out of both ends (trans and differential) of the driveshaft (total of 6 bolts). As mentioned, you'll need to rotate the shaft so put your jack stands under the frame (I have a hoist so this isn't an issue).

- Remove the center support crossmember

- Make like a caveman and yank the assembly down at the center bearing

- Use a prybar or big honkin' screwdriver and work one of the centering pins (front or rear) off the flex disc (mine were stuck). Watch out as that end of the shaft will fall.

- Repeat prying the other pin off and the shaft will be on the floor.

Depending on how tight the slip yoke is (mine were both pretty loose) you may need to back off the gland nut on the slip yoke. It's easier if the yoke will slide a bit.

Worked for me.

Dan
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Old 07-05-2013, 01:54 PM
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I generally remove the Drive Line when I pull an eng/tran combo.
though I have left the front section attached a few times and it worked ok on a w123. but I did have a problem with it hanging up on a 123 the last time I left it on.

Leaving it on in a W126 will be a problem as the 126 has a metal plate welded across the tunnel at the rear part, and the DL will bind as it wont lower down enough to clear when angling the eng/trans to get it out. I had to hack Saw the plate and bend it down with a prybar to get the DL to get under it. what a PITA that caused.

Really not all that difficult to remove the DL. remove the three bolts on the Transmission end, leave the flex disk on the trans. 8mm hex but and a 17mm nut.

The Diff end I also leave the FD on the Diff and remove the DL. two 15mm wrenches here, the nut could be a 17mm.

Remove the 2 14mm bolts on the center bearing.

Use a Pry bar to break the seal between the DL and the rubber disk, rotate the DL as you pry around the 3 side of the disk. then with the 46 mm loose, pry the center bushing off the centering pin on the Diff end.

Be sure the 46mm nut is snug, and drop the rear of the DL, and walk it back and down out of the vehicle.

Charlie
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Old 07-05-2013, 03:01 PM
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Quote:
Originally Posted by Jooseppi Luna View Post
Let me rephrase this: the driveshaft appears to be attached to the flex disc/transmission by three bolts. Can I jut undo those and pull the transmission out without collapsing the driveshaft?
Only if you remove the transmission and the engine in one go

You need the shaft to be collapsed a bit to get the ends of the prop shaft out of the yokes if you aren't removing either the differential or the transmission and engine in one go.
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Old 07-05-2013, 03:25 PM
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Getting it back in might be a problem. It's so much easier to just bolt up the engine and transmission, then fit the driveline. Trying to get things back together while dangling on a hoist might be really tricky.
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  #10  
Old 07-05-2013, 03:55 PM
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Originally Posted by mach4 View Post
Getting it back in might be a problem. It's so much easier to just bolt up the engine and transmission, then fit the driveline. Trying to get things back together while dangling on a hoist might be really tricky.
Well, the car is being cut up for scrap, so I don't care! I'll keep that in mind for the 'SD, though. Thanks, all! Hopefully I can get back at this tomorrow...
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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  #11  
Old 07-06-2013, 12:02 PM
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I saw this and thought of you!

Here are two pictures showing why you need to shorten the propshaft in order to get it out





Notice how far the end of the shaft goes past the yoke attachment points at either end
Attached Thumbnails
Driveshaft/transmission questions (removing engine/transmission in 1984 300D W123-front-end-w123-300d-propshaft.jpg   Driveshaft/transmission questions (removing engine/transmission in 1984 300D W123-rear-end-w123-300d-propshaft.jpg  
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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!
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Old 07-06-2013, 04:53 PM
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Thank you very much! I am leaning toward backing off the driveshaft now...
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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