More vibration and clattering on acceleration - Page 2 - PeachParts Mercedes-Benz Forum

leathermang · #16 06-01-2016, 05:49 PM

Quote:

Originally Posted by ambush276

.... and that the flywheel is not tight. .....

Is that a typo ?

ambush276 · #17 06-01-2016, 06:30 PM

yes sorry. it is tight.

I am thinking it is something in the engine bay. Although the mounts are brand new... they do seem a bit low. I have never replaced the engine shocks (but i am not sure if that would cause my problem). The car does not rattle as much as it does vibrate. You can feel it in the pedal a lot and in the floor some and in the steering wheel a decent amount.

The other weird part of this is the idle. Fast idle lots of vibration, 2/3 idle much less noise and less vibration, and low idle engine shakes more vibration.

junqueyardjim · #18 06-01-2016, 07:24 PM

Is the large nut at the rear of the front shaft tight? It has to be snug and if it is not snug will allow vibration to begin on the drive line, but that would be a speed and usually with a light load, like cruising along at about 40 to 50mph. But you are speaking about an idling situation so that would not be the cause. Does your vibration decrease when the engine is well warmed up?

ambush276 · #19 06-02-2016, 12:42 PM

It decreases ever so slightly. I have to make the idle faster as the engine warms up. On a. Cold engine the idle has to be a little faster and on a warm engine the idle has to be a bit slower.

leathermang · #20 06-02-2016, 01:35 PM

So lets go back to before this thread..... you had NONE of this stuff before you did that work to the car ... right ? This is ALL after what was done .... and was immediate after putting all the parts together ?

barry12345 · #21 06-02-2016, 04:18 PM

Quote:

Originally Posted by Frank Reiner

The above conclusion is easy to reach; all MB inline engine assemblies (crankshaft, front hub, flywheel) are balanced as assemblies. Some, randomly, may not have required any drilling of the flywheel and/or the front hub to achieve the desired state of balance. The existence of a "neutral" flywheel is a matter of chance, rather than a matter of design.

See Post #7.

Good catch. Never occurred to me. Could easily account for the reported cases as well. That is some claiming neutral balance and others not when checked. Since he is sure he got the flywheel indexed as it was before removal. So it is a non issue although to me was the most probable one originally.

Frank Reiner · #22 06-02-2016, 05:04 PM

Quote:

Originally Posted by ambush276

im pretty sure that was all aligned correctly and that the flywheel is not tight. but I am pretty sure everything was balanced and reinstalled correctly.

Quote:

Originally Posted by barry12345

Good catch. Never occurred to me. Could easily account for the reported cases as well. Since he is sure he got the flywheel indexed as it was before removal. So it is a non issue although to me was the most probable one originally.

barry:

In reading through the thread, the tone of the OP's statements, unfortunately, conveys a lot of uncertainty. When asked specifically about indexing of the flywheel/crank, the question has gone unanswered. To my mind, "pretty sure" is not high on the confidence scale.

leathermang · #23 06-02-2016, 05:19 PM

Quote:

Originally Posted by Frank Reiner

....In reading through the thread, the tone of the OP's statements, unfortunately, conveys a lot of uncertainty. When asked specifically about indexing of the flywheel/crank, the question has gone unanswered. To my mind, "pretty sure" is not high on the confidence scale.

LOL, X 2.

barry12345 · #24 06-02-2016, 05:31 PM

Quote:

Originally Posted by BWhitmore

Hopefully you installed the clutch disc and pressure plate as a balanced set. Installing a mismatched clutch disc and pressure plate can also create a vibration in addition to a flywheel that was not indexed to the crank.

I assumed with the vibrations present with the clutch disengaged it could not be an unbalanced clutch disk. The way new pressure plate assemblies are usually made find it unlikely that they would be unbalanced. Yet still are probably checked in manufacture and perhaps the ones that do not pass are corrected.

You could lose your market share very fast if this was not so.

BWhitmore · #25 06-02-2016, 05:52 PM

This may be old school but in days past it was always recommended that the pressure plate and the clutch disc be replaced as a balanced set.

leathermang · #26 06-02-2016, 06:51 PM

Quote:

Originally Posted by BWhitmore

This may be old school but in days past it was always recommended that the pressure plate and the clutch disc be replaced as a balanced set.

That would be good...
but since this is happening with the clutch depressed... not likely the cause of the present complaint...

ambush276 · #27 06-03-2016, 09:40 PM

i bought a sachs clutch disc and plate. I did not do anything beyond installing them, aligning, and making sure the flywheel was put back in it's original aligned position. I am going to do a valve adjustment, diesel purge, and replace the fuel filters next week (it's been ~10k miles).

leathermang · #28 06-03-2016, 09:42 PM

I suggest you do those one thing at a time and test each time... so you will know in the future...and can share with the forum what was causing this situation...

ambush276 · #29 06-04-2016, 09:54 PM

sounds good. I will report back in a week or 2. Finishing up the A/C this and next weekend. Gonna need it this summer. (;

ambush276 · #30 06-12-2016, 07:01 PM

an update. i have noticed that i now have my clutch broken in a bit (~400 miles) and there is less vibration and shaking during acceleration. Still not perfect but better. I just sent my spedo and cruise control amplifier in for repair (thanks JamesDean) and when those get back i will do purge, vavle adjust, filter change, and oil change.