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Driveline or Bad Tires?
Recently, after prolonged driving, my '84 300D developed a clunking noise in the rear which became much louder (and slower) when I slowed down, suggesting that it was vehicle speed-related. The first time it happened during a long trip, I suspected that the heated-up tires were the culprit, so I had my tires rotated and balanced. This resulted in a severe vibration in the front--a predictable consequence of putting a bad tire on the front that had been in the rear. So I replaced the bad tires (now in the front, with the presumably good tires in the rear) with a couple of Yokohama's...a superior tire. This seemed to remedy the noise and vibration until today, when I took another long trip, and the same noise arose from the rear. The noise didn't become audible until I had driven at speed for about an hour, and then had to slow down for city driving. Can I reasonably suspect that ALL the old tires are prone to develop this same characteristic? By the way, the old tires are Pirelli's, a brand that I'll never again consider. This might sound as if it should be in the tire forum, but I'm not totally convinced it's tire-related.
I jacked up the rear and looked for play along the axle shafts, and other obvious things. Everything seemed normal. Does this sound as if it's definitely the tires? The reason I have ANY doubts that the tires are the cause, is because the clunking noise sounds so much like metal driveline instead of rubber... ...any ideas?
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Matt ------ 1995 E300 Diesel (Die Blau Frau) |
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Thanks Bill. That's about what I suspected...and feared.
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Matt ------ 1995 E300 Diesel (Die Blau Frau) |
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Matt
I had this happen to my 240-an awful clanking noise from the rear happened after I had pulled a U-turn... I pulled another U-turn in the other direction and it went away! Was a CV joint giving up. Replaced both with junk yard ones. Look for new rubber boots for a recent replacement.
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Ed 1981 300CD (Benzina) 1968 250 S (Gina) 266,000 miles! 1983 Alfa Romeo GTV6 (Guido) 1976 Jaguar XJS-saved a V-12 from the chevy curse, what a great engine! 1988 Cadillac Eldorado (better car than you might think!) 1988 Yamaha Venture (better than a Wing!) 1977 Suzuki GS750B 1976 Yamaha XS 650 (sold) 1991 Suzuki GSX1100G (Shafty Gixser) 1981 Yamaha VX920RH (Euro "Virago") Solex Moped 1975 Dodge P/U camper "Time spent in the company of a cat, a beer, and this forum, is not time wasted!" |
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Completely Unrelated!!!
But the symptoms sound identical!!! Numerous times on past vehicles and most recently on a GM frontwheel drive box these symptoms have been indicative of constant velicity joint failure. Doesn't your car's rear axles employ a couple of these joints. Wheel speed related noise gets much worse quickly over time. Slow turns are the worst. Just a thought, Good luck.
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Matt, BillyBob
When I looked under my 240D, I couldn't see anything obvious, and the axle shafts looked normal. I jacked up the rear of the car and supported the body on jack stands (not under the axles, of course) and ran the engine in drive (D). I could easily tell it was the CV joints. Replaced both axles with junk yard ones. Each axle comes with 2 CV joints. When I got them off the car (refer to Haynes manual for removal) I could tell which one was bad by turning it in my hand. I did a search on this forum concerning "CV joints" and it helped a lot. Not cheap new...
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Ed 1981 300CD (Benzina) 1968 250 S (Gina) 266,000 miles! 1983 Alfa Romeo GTV6 (Guido) 1976 Jaguar XJS-saved a V-12 from the chevy curse, what a great engine! 1988 Cadillac Eldorado (better car than you might think!) 1988 Yamaha Venture (better than a Wing!) 1977 Suzuki GS750B 1976 Yamaha XS 650 (sold) 1991 Suzuki GSX1100G (Shafty Gixser) 1981 Yamaha VX920RH (Euro "Virago") Solex Moped 1975 Dodge P/U camper "Time spent in the company of a cat, a beer, and this forum, is not time wasted!" |
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