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Replacing both flex discs
I've looked and looked for a good, comprehensive DIY article on how to do this (this'll be my first time doing major work under the car). I've seen snippets of stuff from lowering the transmission to dropping the entire driveshaft....I'm lost... Give a guy a hand here?
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- 1979 W123 240D 4-speed, 390k miles |
#2
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Re and RE Flex disks
If you are doing the disks only they will slip in and out. the spline can slide in some to allow the needed space. the direction the disk faces is important. Follow the original. NOTE keep the drive shaft in the same relationship to the other half to maintain the balance. Also keep the points at the disks in exactly the same position to each other and only do one disk at a time.
Now would be a good time to think about the center bearing and rubber support. What condition are they in. Check the rubber for cracks. But that can be another job when necessary.
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom |
#3
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You will need a 17mm and a 15mm wrench or a allen (forget size). Spray with PB before even getting started. You will need to drop the rear trans mount. You will also need to jack up one rear tire in order to rotate the DS. It is VERY time consuming. If you go with a 15mm socket it needs to be thin walled. I would recommend a light dab of loctite even with the nylon nuts. Do not tighten the slip joint with the rear unloaded. Make sure you get the orientation right as well.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#4
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I assume you've checked the flex discs and determined they need changing? (cracked, or worse)
The reason I asked is that after reading here about the need to replace these I immediately ordered a pair (and the center bearing and support) for my 300TD, since it has about 230,000 miles and no indication in the paperwork that came with the car (or memory of the previous owner) that they have ever been replaced. I just took a look underneath with my digital camera and lo and behold the disks look absolutely fine (no cracking or sign of worrysome wear at all!). So I've put off replacing these at this time. Maybe it was done at some time in the past that doesn't show up in the paperwork, who knows... If you DO need to replace them, there's some great writeups on the forum if you just search a bit. Also some youtube videos I've come across. Good luck and work safe!
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1983 300TD 240K - 1982 240D 215K - 1996 Dodge Cummins 70K |
#5
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On each end of the Drive Shaft there is a Pin that goes into the Bushing previously spoken of. The quality Bushings are like $55+ each so it pays not to damage them to begin with. The also need to be lubed with Grease.
To gain enoughs space to get the Pins out of the Bushing you need to loosen the 46mm Nut on the Driveshaft and slide the Yoke back till you have enough room to clear the Pins. On mine the Flex Disx was stuck in the recess that the Steel Tubes on the Flex disc go into. It takes some bit of prying and force to get them out but you need to be careful not do damage thos Bushings. I thought there was a more detailed DIY in the DIY section. DIY Repair Links DIY Links by Parts Category - PeachParts Mercedes ShopForum PeachPartsWiki: Do It Yourself Articles - Mercedes Vehicles
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84 300D, 82 Volvo 244Gl Diesel |
#6
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Answer
Quote:
W126_Rubber Boot_drive shaft center support bearing W126_Rubber Boot_drive shaft center support bearing - PeachParts Mercedes ShopForum W126 drive shaft carrier/center bearing DIY W126 drive shaft carrier/center bearing DIY - PeachParts Mercedes ShopForum Bad flex disk driving home Bad flex disk driving home - PeachParts Mercedes ShopForum Bad Flex Disc Bad Flex Disc - PeachParts Mercedes ShopForum Weekend Wrenching (a great picture of a bad flex disc) http://www.peachparts.com/shopforum/showthread.php?t=216701 The Death of a Flex Disc ... did I kill my 240D? The Death of a Flex Disc ... did I kill my 240D? - PeachParts Mercedes ShopForum What happens when you ignore that "little" driveline vibration! What happens when you ignore that "little" driveline vibration! - PeachParts Mercedes ShopForum Pay attention to your car! Pay attention to your car! Flex Disc Orientation, safety and durability issue. Flex Disc Orientation, safety and durability issue. - PeachParts Mercedes ShopForum If your W123 is shaking down the highway. . . If your W123 is shaking down the highway. . . - PeachParts Mercedes ShopForum Correct way to install front driveshaft guibo? (FLEX DISC) Correct way to install front driveshaft guibo? - PeachParts Mercedes ShopForum .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#7
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I have the d/s out now. The two halves have been marked but I did nothing in terms of marking the flanges. Am I in trouble?
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1980 240D, 197580 miles - "The Stuttgart Stomper" |
#8
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FYI
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Read this one, and follow directions. Flex Disc Orientation, safety and durability issue. Flex Disc Orientation, safety and durability issue. - PeachParts Mercedes ShopForum .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#9
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Quote:
Huge relief! Thanks hunter!
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1980 240D, 197580 miles - "The Stuttgart Stomper" |
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