 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Mercedes-Benz Cars / February 2008Driveshaft Vibration Dampener Repost
I wasn't very clear on my original post so I am asking again. Thanks for your input. Some Mercedes have a rubber and metal disk that mounts on the front of the driveshaft. It is called a vibration dampener. This is not the flex disks that connects the driveshaft to the transmission and differential. Both my 230CE 4-speed and the donor 190E 5-speed have a dampener. I have looked at many MB in wrecking yards and some have the dampener and some do not. I need to have a driveshaft shortened for the 5-speed to fit into the 230CE. TSB ref# 41/15 dated Feb. 1991 for the 190E states that model 201.028 (2.3 engine)has a dampener and model 201.029 (2.6 engine)does not have it but does have a modified flex disk. It states that both have manual transmissions. The shop I talked to about doing the work, http://www.driveshafts.com/ , in Portland, OR, specializes in MB, BMW and Lexis drive shafts seems to know what they are talking about. They were recommended in a MB forum. They said that it does not need the dampener and the one that I get from them will not have one. I agree with what Tiger said that if it doesn't need it MB would not have put it there. Since the work will cost close to $500 with new u-joint, support bearing, centering bushings and flex disks, I want to be sure that it will work right with no vibration. Do you know if it will be OK with out the vibration dampener? Thanks, Scott Scott Buchanan schrieb: > I wasn't very clear on my original post so I am asking again. Thanks for > your input. [quoted text clipped - 22 lines] > > Do you know if it will be OK with out the vibration dampener? The dampener is to smooth the belts drive. It has to decouple belt modes from the crankshaft modes espacially for 4 cylinders. Its of course not so important as for engines with belt driven cam shaft. Under resonance the belt may jump a tooth forth. I dont know if its really an essential in the 230's.  SignatureRoland Franzius Roland Franzius schrieb: > Scott Buchanan schrieb: >> I wasn't very clear on my original post so I am asking again. Thanks for [quoted text clipped - 36 lines] > modes from the crankshaft modes espacially for 4 cylinders. Its of > course not so important as for engines with belt driven cam shaft. ^^^^ Must be without > Under resonance the belt may jump a tooth forth. I dont know if its > really an essential in the 230's. The belt and camshaft chain system is a system of vibrating strings with rather high characteristic frequencies. With a stroboscope lamp you can see the vibrations. Its essential to damp the resonances. The rubber belts for alternator and pumps are rather short with high resonance frequency and damping occurs via friction in the v-notch. Long flat belts without specific dampers are in danger to hop at specific motor rpm. I think that MB installed the damper mainly to reach the 300000 miles zone for the camshaft chains because the damper effectively reduces wearing out by resonance oscillations. For Renault cars they say without a damper the tothed timing belts have to exchanged more frequently SignatureRoland Franzius Hi Scott: We have many driveshafts through here some have built in vibration dampners and some do not, even same make,model and year, as long as your unit is properly balanced by manufacturer, should be no problem. The fact you are using a professional rebuilder will get rid of most of your headaches. Don Sparks (Bowtie Benz) >I wasn't very clear on my original post so I am asking again. Thanks for > your input. [quoted text clipped - 29 lines] > > Thanks, Scott I don't know the specific technical answer to your question, M-B engineers might. But, I suspect the reason for such drive shaft dampers is to smooth the pulses of the four cylinder motor vs. the smoother six cylinder motor. Think about letting out the clutch to get the car moving from a dead stop, the four's pulses may be felt slightly as the car begins to move whereas a six cylinder motor's more frequent fires would not be so felt. This isn't a drive shaft balance issue, it won't shake at any speed, regardless of motor, if the shop balances the shaft. Balance is not the reason for a damper, it's job is to absorb pulses. I hope this helps you. Signature© 2008 T.G.Lambach. Publication in any form requires prior written permission. That sounds reasonable. As memory serves, from about 10 cars that I have seen in the wrecking yards, four cylinder gas engines and diesels have the driveshaft dampeners and six and eight gas engines do not. Only thing is that I would think that the pulse dampening effect would be insignificant compared to the mass of the flywheel. > I don't know the specific technical answer to your question, M-B > engineers might. [quoted text clipped - 14 lines] > © 2008 T.G.Lambach. Publication in any form requires prior written > permission. I would think that the pulse dampening effect would be insignificant compared to the mass of the flywheel. Well, yes, on a 1:1 drive but when the ratio of engine to drive line increases as it does in 1st and 2nd gears you may sense the four cylinder motor's pulses. Subtle, but may be noticeable - if one is looking for it. Signature© 2008 T.G.Lambach. Publication in any form requires prior written permission. Hi Scott: I have Fords listed 94 - 98, 4.9 litre to 7.3 litre with attached dampner, the interchange shows with or without dampner, so much for the 4 cyl theory. Interchange is what you can use in place of the listed part. So after searching lots of makes and models it would appear that one will replace the other. Some Automatics and some standards have them, some don't. We go by the interchange which says OK. Don Sparks >I wasn't very clear on my original post so I am asking again. Thanks for > your input. [quoted text clipped - 29 lines] > > Thanks, Scott |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2010 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.