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#1
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Bad Flex Disc
Pictures of my rear flex disc that was bad.
:EDIT: 1985 300SD disc failed at 250,000 miles.
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ASE Master Mechanic https://whunter.carrd.co/ 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 2003 Volvo V70 https://www.boldegoist.com/ Last edited by whunter; 04-21-2005 at 08:31 PM. |
#2
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More pictures
of bad flex disc.
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#3
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Bad news when one of those puppys lets go, so I'm told.
Thanks much for the images.
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Think Alternative Energy! ![]() 300CD '80 (now gone but not forgotten...) ![]() |
#4
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In reading my manual for the 280TE, it says you must off center position the forward flex disc (trans end). In other words the bolts do NOT center on the holes in the disc. Is there a reason for this?
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1984 300D Turbo Sedan (Hilda) 272,115 miles..... ![]() Anthracite Gray/Palamino Leather, I am 3rd owner ![]() 2001 Dodge Stratus (Silver) (wifes) 55814 miles... ![]() 1982 280TE Wagon Astral Silver Metallic/ Anthracite Velour 260,512 miles (Eva) ![]() 1969 230 Sedan Olive Green/Black MBTex 4 Speed Manual 84,213 miles ???? Haus Frau 2004 Boreem Ninja Pocket Bike Highly Modified 49cc (Ling Ling) Einigkeit und Recht und Freiheit |
#5
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How many miles were on this vehicle and what vintage was it?
Also - I'm still looking for your temp display, going to look about tomorrow. ![]()
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I'm not a doctor, but I'll have a look. ![]() '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#6
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![]() Quote:
![]() Last edited by whunter; 06-16-2010 at 11:28 AM. |
#7
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Ah... makes me think that I still should consider replacing mine just as PM anyway...
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I'm not a doctor, but I'll have a look. ![]() '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#8
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Important thing to check several times a year......and not after the driveshaft tries to recontour the center tunnel.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#9
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I wonder how my flex disks look...
...that little extra power...my constant right foot on the floor...and occasional downshifts to drop speeds into the legal sector probably don't help much ![]() I checked them when I got the car...time to check them again. Whunter did you notice any vibrations...oddities...anything? |
#10
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I would like to have a digital camera right about now.
I inspected my flex disks, and both of them look pretty much the same. There are some visible surface cracks all over the rubber, and some deeper cracks where the enlarged rubber bosses meet the thinner section. On each side of the M-B star and the printing on Sady's disks above. There is no sign of any deformation or separation of the metal inserts from the rubber. No cracks in the direction of rotation, as I see in a lot of the pictures in this thread. There are lots of pictures of disks that clearly need to be changed, but none of disks which aren't new, but are still serviceable. We have the "no-go" part only, of the "go, no-go" test. I was going to change them, but now I think I'm just going to see how they look after another 10K. |
#11
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What's a flex disk?
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1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#12
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Flexdisk has the same job as a u-joint on the drive shaft.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D |
#13
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Similar job, but it won't deal with very much of an angle. The Benz has a body-mounted final drive unit, so the driveshaft doesn't move around when the suspension moves.
U-joints fail on RWD live-axle cars also, with similar very bad results. Drag racers are required to have driveshaft hoops to contain the shaft in the case of a joint failure. |
#14
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That is good info. Those hoops would be good on production cars as well.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D |
#15
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Quote:
Any similar symptom on the flexdisk?
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1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
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