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84 300SD with loud, hard, thump/clank.
This car spent years with vacuum problems and hard shifting. I've got most of the shift problems solved. Now it's developed a rhythmic scary thump under moderate to hard acceleration from a dead stop. Sometimes it even does it in second gear when accelerating hard.
The sound seems to be located in the middle of the cabin towards the rear seat. 300+ thousand miles on this car and I've owned it for 7 or 8 years. I've done some of the rubber on the front end like engine shocks and mounts but I don't think anyone else ever got under it. Edit: It's really not a clank it definitely a thump.
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84 300SD 85 380SE 83 528e 95 318ic Last edited by Clemson88; 08-17-2014 at 10:47 AM. Reason: I got excited and exaggerated |
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Quote:
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Center support driveshaft bearing mount. Fairly easy to change. But you may need to change the bearing as well.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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Thanks, VStech. I was thinking it's somewhere in that area. I've been reading up on it here and decided if that was the problem I'd replace it and both flex disc too. I've already got the do it yourself on this stuff marked.
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84 300SD 85 380SE 83 528e 95 318ic |
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Another question.
Whunter's DYI post on this project shows all this stuff on the bench. Can both drive shafts and center support be removed by just taking out the flex disk and support bolts?
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84 300SD 85 380SE 83 528e 95 318ic |
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And the exhaust, and the center heat shield...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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Why remove the exhaust. I have an 84 SD and never had to do that to pull the drive shaft. Drop the diff 6" and slide straight back.
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom |
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Hmm... I don't think you can get the center bearing without at least lowering the exhaust. it's pretty well covered.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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Again I thank you but continue to ask questions.
I'm doing this project in the carport. I've noted that I need to rock the car to let the drive shafts' assemblies settle before locking them in. I also understand that putting the car back on jack stands almost always undoes this. What is the solution to this delimma?
Also, Pelican Parts list a 'Driveshaft Centering Bushing front/rear. Is it common to change this part or is that something unusual?
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84 300SD 85 380SE 83 528e 95 318ic |
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