300 turbo manual 1700-2000 RPM vibrations - Page 2 - PeachParts Mercedes-Benz Forum

lutzTD · #16 12-11-2008, 09:31 AM

could you also weigh your flywheel? I added a 1" thick ring and it is only 6 pounds. before ring computer weight is 28 pounds and its 34 pounds with the extra ring

winmutt · #17 12-11-2008, 02:10 PM

Lutz, you have the correct cross member right?

lutzTD · #18 12-11-2008, 02:31 PM

Quote:

Originally Posted by winmutt

Lutz, you have the correct cross member right?

yes, and two extras

Bajaman · #19 12-11-2008, 03:54 PM

The ID of that ring could be be smaller and still get the pressure plate in at an angle (or before the ring is bolted into place). Try taking a 1/4-1/2" off the ID and try the weight.

lutzTD · #20 12-11-2008, 05:17 PM

Quote:

Originally Posted by Bajaman

The ID of that ring could be be smaller and still get the pressure plate in at an angle (or before the ring is bolted into place). Try taking a 1/4-1/2" off the ID and try the weight.

wouldnt fit even at an angle since the pressure plate is a full circle not a segmented circle. but you could make the ring ID smaller if you wanted to bolt the ring on after the pressure plate is installed either way my feeling is the 20# difference that has been stated is probably not correct, there just isnt room there to get an additional 20# of steel

t walgamuth · #21 12-11-2008, 06:33 PM

IIRC the 240 fw is 28# the 300d fw is 38#. Its in a thread somewhere, I weighed mine, and someone else weighed theirs.

lutzTD · #22 12-11-2008, 06:59 PM

Quote:

Originally Posted by t walgamuth

IIRC the 240 fw is 28# the 300d fw is 38#. Its in a thread somewhere, I weighed mine, and someone else weighed theirs.

cool thanks, that jibes with the predicted 28 pounds from my model. now I will have to find a place to add an additional 4 pounds to the ring and not hit the bell

OM616 · #23 12-12-2008, 12:23 AM

I am getting ready to convert my 84 300D that has a SD engine in it, and had a thought when I picked up the fly wheel from the machine shop.

Is everyone using a 240D clutch disk? I would think the springs would be heaver for a 300D. That might be a reason why some vibrate more or less. Softer springs with a taller rear end ratio and low engine speeds could allow the driveline to chatter or vibrate, especially with a fly wheel that has less mass.

Just a thought I had.

t walgamuth · #24 12-12-2008, 06:05 AM

Yes. No issues with a three hundred turbo motor running a two forth clutch and flywheel so far.

I have some failry accomplished craftsmen available to me and I would not try adding weight to a flywheel. It would be tricky to get right and the danger of it coming apart if not done exactly right is too much, a fw coming apart at speed could take off your lower leg or foot.

The two forty fw works very adequately IMHO.

lutzTD · #25 12-12-2008, 07:45 AM

Quote:

Originally Posted by t walgamuth

Yes. No issues with a three hundred turbo motor running a two forth clutch and flywheel so far.

I have some failry accomplished craftsmen available to me and I would not try adding weight to a flywheel. It would be tricky to get right and the danger of it coming apart if not done exactly right is too much, a fw coming apart at speed could take off your lower leg or foot.

The two forty fw works very adequately IMHO.

I am pretty sure I will not end up doing this anyway, along with your concerns which I share, the cost is getting close if not more than the cost of just buying one from MB.

clarencethecool · #26 01-10-2009, 01:42 AM

I'm a little confused when I convert my 300sd, will I want to use my stock flywheel? Why a 240s fw?

#27 01-10-2009, 05:22 AM

Because automatic and manual flywheels are not even close to the same. You'll only need your fw to match balance the 240 fw.

OM616 · #28 03-16-2009, 11:01 AM

The weather finally is getting tolerable here and I thought I would get back under my 300DT, recently converted to a 4-speed, to check the drive line angles as I have associated my vibration to be vehicle speed related as apposed to engine RPM.

As the drive shaft has only one U-Joint it will tend to cause a vibration if not aligned correctly as the U-Joint causes the shafts to slow down and then speed up as it rotates at an angle. With two joints, (one at each end or a CV type cluster), the two joints, when angled correctly will cancel each other out.

After measuring the drive shaft angles I lifted my trans up about 3/4 of an inch at the mount to get both shafts angles to match.

The result was a DRAMATICH reduction in over all vibrations during +45MPH operation. The vibration peek did move up in speed from 35 MPH to 43 ish. and is gone at 47MPH. The vibration is directly related to load as when I back off the throttle the vibe goes away, and if I step on it the vibe is less then light load but more than no load.

I have to pull the trans again to mess with the pilot bearing and I will make up a laser alignment tool to check where the centerlines of the trans and rear-end are pointing. My thinking is that I may have the shafts in line, but the trans center line off. I think I may have to shim up the engine a touch.

Any thoughts?

leathermang · #29 03-16-2009, 01:13 PM

There is a lot of comparison between 300 and 240 flywheels...

Should you not be comparing the weight and balance of a FILLED Torque Converter to whatever you are planning on using when changing that engine to a manual shift ?

Is there also the potential that the large amount of fluid in the torque converter acts like a dampner itself ?

As for substituting a 240 flywheel for a 300... the FSM specifically forbids it...

winmutt · #30 03-16-2009, 05:47 PM

Quote:

Originally Posted by OM616

Any thoughts?

Are you using the 240d auto cross member? Are you using the heavy duty trans mount?