:) After checking the oil to make sure it is still ok....How is your timing chain? Could this be the culprit??

Adiel

6° of elongation corrected to 0° with an offset woodruff key in October 2003. IP timing is spot on. New (rebuilt) injectors installed in April '04.

Remember, it wasn't buzzing before the manual tranny was installed April '04.

Remember, you did not JUST change the transmissions out...
I am holding out for the driveshaft being the problem....

Technically the mass does not have to be more for the smaller engines to carry them to the next power stroke...
But the rotational momentum needs to be more.... so same mass placed further from the center could do this also....
Other Wacko's already know this....

" explains why they never offered it with a manual transmission in the first place."

UH... Right,.... just ALL over Europe as standard equipment....LOLOLOL

No they didn't. Those manny tranny cars in Europe didn't have turbos.

true but the flywheel doesn't care if its turbo or not. the engine balances just the same.

"Those manny tranny cars in Europe didn't have turbos. "

Is that true ?

is there a possibility the a bolt in the driveshaft assembly has
failed? or that the driveshaft center mount, though new has
failed?

the drive shaft and differenial (and axels) are the only two parts that that increase their speed as the gears change. the shafts
and the bearings in the tranny for gears 1-4 are the same. so
it doesnt seem the transmission would be the problem.

the 300d flywheel is heavier to overcome the resistance to 5 cyl
compression compared to 4 cyl 240s. older diesels had heavier
flywheels because they turn slowly and need the momentum of mass. an out of ballence 240d flywheel in a turbo 300d will be
less noticeable than a 300 flywheel. i would think that an out
of balance flywheel (or anything with circular motion) would be
more pronounced with greater rpms.

broken and loose pieces though find a frequency they like to act
up at.

just changed the engine mounts on a w123. vibrated worse than
before and the old mounts were crushed. after a few hard miles
the mounts settled in and everthing is very smooth. engine shock
is broken but no problem.

don

Guys, the USA parts fiche/CD will not show a manual flywheel for a 300D, because
there were none imported to the US. They are different, I will post the part number and
technical differences tomorrow from work (or shortly after). From memory there is a 16mm
increase in total length in addition to the added weight, specifics to follow. Last I
checked was about 4 years ago when I still had my '77 300D, the dealer wanted about
$340 USD for a new one. Used ones can be found with a little perseverance, you might even
be able to avoid balancing in that case (IIRC new they come completely unbalanced, "ideal"
would still be to check for static unbalance at a good machineshop...although I have known
guys to run 240 flywheels in their N/A 300s with no weird vibes, should be the same for a turbo).


R Leo, a couple of quick questions, one did you make sure to align the markings between the
flywheel and crankshaft, and two was your u-joint replaced when the driveshaft was
rebuilt?

Yes, marks were aligned. BTW- I can slowly rev the engine to 4000+rpm with the clutch disengaged and there's no vibration aside from the routine movement of the engine.

Yes, new support and center bearing too; plus it was all balanced.

The modified (for the manual conversion) driveshaft was made up from a remanuactured driveshaft (which to the point that the conversion was started, did not have any vibration) and the shortened front stub from a donor 240D. The work was done by a reputable shop and it was balanced after the fabrication was completed.

I did not replace the centering sleeve on the front shaft stub. However, I did try fit the stub onto the transmission's output shaft, pulling and pushing it radially to try and detect any play; there was none that I could detect.

I think you've got sufficient evidence to point to the transmission. Drive it over here and let me look at it. :D

If he drove that far he would expect you to sell him your manual 240.... for which he has a parts car stored here...
How much would you sell it for ?

$500 and I keep the 1/2 shafts.

That's what I think too.
 

In fact, I believe that it is either the countershaft bearings or the output shaft bearing.

Anyway, I just returned from picking up 2 qts of RedLine MTL at Austin VeeDub (thanks Greg!) and will install it in the gearbox sometime soon. I have to drive the wagon about 1000 miles in the next 5-6 days and want all the luberosity I can get inside there. Plus, between now and mid-July, I don't have any time to mess around swapping boxes with Jane Doe-ner

That would be fun but, I'm headed the other way (Australia/Kiwiland). But, whatever you do, don't junk the perfesser.

Rick, After you blew the head gasket those half shafts are the most valuable part of the car.... How did you become so attached to them ? You don't have another car that they will fit.... will they be part of some art project in your boat .... or living room ?

Other than the car itself, they are the parts I paid the most for. They have a lifetime warranty, and I'll eventually own another W123. In the meantime, yes they'll look great on the living room wall. :o