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#1
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vibration and tap tap tap sound from center of car on take off acceleration
I have an e320 wagon that I'm noticing a tap tap tap and vibration when I hit the gas from a stop. It doesn't seem to be there when cruising or even accelerating later. I've only noticed it on take off.
Any ideas what this could be? Background on the car, bought it used fixed an exhaust leak changed the MAF sensor, put new tires on it. Seems to run good. It was rear ended at some point. It doesn't look bad but I know the frame is bent a little bit. I can see a small crease in the roof metal between the two doors (front and rear) also the doors close a little tight. So I'm sure there's a little bend in the frame from the rear end collision. It drives fine and straight. But maybe this could be related maybe not. What should I be checking? thanks! Nick
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#2
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Ill bet its your flex disc.
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#3
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What year car? 4-matic?
Flex disc or center support issue, don't forget the trans mount.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#4
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Quote:
Would a bad center bearing cause this only at take off?
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#5
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Could be the rear of driveshaft if it has U Joint , or center support , only way to check is to remove drive shaft and inspect
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#6
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Is it possible to check the center bearing by pushing and pulling up and down on the drive shaft to feel for play? I'd guess it's a small enough bearing that any play that'd cause noise issues wouldn't be noticeable by hand but figured I'd ask since I don't know the answer to this.
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#7
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any idea how to check the center bearing? Is it possible to check without pulling the drive shaft? It'll probably be a 2-3 hour plus job if I have to pull the drive shaft.
Plus it's almost pointless to do all that without putting money into new flex discs and a center bearing. I'm trying to keep this cheap.
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#8
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Nick, as you're probably know there is a slip joint in the driveshaft. You need 41mm and 46mm open end wrenches to loosen the nut in order to "telescope" the driveshaft when replacing the flex discs. Before you go to the trouble of replacing the flex discs and center support you may want to simply loosen the nut to relieve any accident-related stress that is tending to bow the driveshaft. From my experience the rear flex disc is more problematic so inspect it carefully for cracks.
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Fred Hoelzle |
#9
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Quote:
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. Last edited by 777funk; 04-28-2012 at 11:49 AM. |
#10
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flexdisc or halfshaft CV joint.
Had the rear flex go on y C36- got to the point where sounded like someone banging on the car underneath with a sledgehammer under load. Inspect it and it before the driveshaft rips through the floorpan and totals your car.
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03 540I (GAK!!) 81 280E (W123) 70 LeMans Sport with pissed off Poncho 462" 1989 Silverado Step Side (under the knife- complete restomod) |
#11
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it looked like this
1500 miles from home when this happened.
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03 540I (GAK!!) 81 280E (W123) 70 LeMans Sport with pissed off Poncho 462" 1989 Silverado Step Side (under the knife- complete restomod) |
#12
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Nick, sorry for not being more clear. Yes, you want to briefly loosen the nut to allow any accident-related stress to release, then retighten the nut.
It would be ideal if you could get your car on a dynamometer and observe the driveshaft motion when it starts to turn and makes the tapping sound.
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Fred Hoelzle |
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