What are some symptoms of those parts going bad? TIA

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1984 300TD

But most folks don't let it get that bad. You know, ya have to get under the old girl and check simple things like that out once in a while. Most of the problems are pretty visible, though you might well bring a flash light along.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

I had a slight clunk on downshifts and a vibration from under the console only between certain speeds.

The rubber was torn on the driveshaft support and my flexdiscs were in bad shape. As stated by Jim, you need to crawl under a take a look. When a flexdisc fails it can be catastrophic.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

Darn, I was afraid you guys would say that. It's cold and wet here.

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1984 300TD

If you see even a smidgeon of a crack they should be replaced.

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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

Agreed.
Mine had no cracks and appear perfect (in fact you can have em cheap)but the center bearing support rubber was bad and I had a vibration at highway cruising speeds. I changed the disks and disk bolts anyway since the drive shaft had to come off anyway. Although the disks I took off look perfect I am new to the car and have no idea how old they are. I wouldn't hesitate to reuse them on a non turbo ... if they are the same?

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR

I had a rhythmic thump @ low speeds, it increased w/ speed (not rpm) but the thump didn't 'match up' w/ the rotational speed of the tires (it was too fast) if that makes any sense. Mine were really shot.

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Cheers,
Robert

I had a bad carrier bearing. It made a klunking noise when I started to roll, the changed to a slight vibration when under way. When I changed it out i replaced the flex discs as a matter of preventitve mantinence as the driveshaft was out anyway.
Jon J
81 240D