Auto -> Manual Transmission Conversion Has Begun. - Page 15 - PeachParts Mercedes-Benz Forum

boneheaddoctor · #**211** 01-16-2005, 03:12 PM

Quote:

Originally Posted by TomJ

The point is, balanced to what? If you don't have the rotating/reciprocating assy out of the engine (crank, rods, pistons, flywheel, harm balancer, etc.) then you can't just take a flywheel to a balance shop and say "balance it". They need something to balance it TO. If we were dealing with an internally balanced engine, then yes, they could just zero balance it (no offweight balance), but these are externally balanced so they need to know how much counterweight to add to make up for the same amount of "off-balance" that the original flexplate has. That's why the caveat to mark the crank and flexplate BEFORE they are separated, so you can have a shop induce the same "off-balance" at the same place relative to the crank and install the same way.

And I sould add that both engines should be at common position when they are marked to be of any use....such as both motors to TDC on #1 compression stroke and mark booth at the same spot on the crank. Otherwise you are comparing apples to oranges.

wolf_walker · #**212** 01-16-2005, 03:38 PM

Quote:

Originally Posted by TomJ

The point is, balanced to what? If you don't have the rotating/reciprocating assy out of the engine (crank, rods, pistons, flywheel, harm balancer, etc.) then you can't just take a flywheel to a balance shop and say "balance it". They need something to balance it TO. If we were dealing with an internally balanced engine, then yes, they could just zero balance it (no offweight balance), but these are externally balanced so they need to know how much counterweight to add to make up for the same amount of "off-balance" that the original flexplate has. That's why the caveat to mark the crank and flexplate BEFORE they are separated, so you can have a shop induce the same "off-balance" at the same place relative to the crank and install the same way.

I promise I'm not trying to be a smart-xxx here, but this is pretty much SOP.
Unless your going to pull the recip assembly down and have it all done, all you can do is try and match what was on the motor. Do MB converters have balance weights on them?

TomJ · #**213** 01-16-2005, 07:00 PM

Quote:

Originally Posted by wolf_walker

I promise I'm not trying to be a smart-xxx here, but this is pretty much SOP.
Unless your going to pull the recip assembly down and have it all done, all you can do is try and match what was on the motor. Do MB converters have balance weights on them?

Exactly. The thing is, most of us haven't been marking or having the 240D flywheels balanced to the same as the flexplate that we removed. Most just install the 240 flywheel matching the marks from the donor engine.

Also, on some engines, there is no index mark to begin with, that's why I say make sure it's indexed before you take the flexplate off.

wolf_walker · #**214** 01-16-2005, 08:11 PM

Ok, gotcha..

You guys are going to be able to write a book on this stuff soon..

R Leo · #**215** 01-16-2005, 08:57 PM

I'm not going to worry with balancing it on my car. I can rev the engine to 3500-4000 sitting still in the driveway and there's no more vibration than there is on my box-stock 300D. If it was 23 gm OOB, that damned thing would shake like a three-legged washing machine in spin cycle.

TomJ · #**216** 01-17-2005, 01:22 AM

Quote:

Originally Posted by R Leo

I'm not going to worry with balancing it on my car. I can rev the engine to 3500-4000 sitting still in the driveway and there's no more vibration than there is on my box-stock 300D. If it was 23 gm OOB, that damned thing would shake like a three-legged washing machine in spin cycle.

I'm probably not going to deal with mine either, until I have a garage and play time, so probably never. Mine doesn't vibrate much either, but these engines are SO stout on the bottom end, even out of balance, they'll probably go many K miles without issue and probably not vibrate much either.

R Leo · #**217** 01-17-2005, 09:21 AM

Quote:

Originally Posted by TomJ

I'm probably not going to deal with mine either, until I have a garage and play time, so probably never. Mine doesn't vibrate much either, but these engines are SO stout on the bottom end, even out of balance, they'll probably go many K miles without issue and probably not vibrate much either.

FWIW, 20gm is about the weight of a travel-size tube of toothpaste.

TomJ · #**218** 01-17-2005, 11:37 AM

Quote:

Originally Posted by R Leo

FWIW, 20gm is about the weight of a travel-size tube of toothpaste.

No wonder I smell "mint" everytime I handle that flexplate!

fisch · #**219** 04-15-2005, 10:48 PM

great work on this thread, VERY informative.

everything here seems to be diesel to diesel... so here goes a stupid question

i have an OM617 (currenlty with an automatic) that i would like to swap into a euro 1980 230 (M115.973) with a 4 speed manual (711 maybe?) the tranny has a cast iron case (SAE80 stamped on the side).

it looks like the OM617 will bolt up to the 4 speed manual, but i'm wondering if the flywheel from the M115 would need to be replaced with a flywheel from a diesel engine?

are there differences in the diesel and gas engine flywheels?

i'm going to guess that i will need a new flywheel (based on info from this thread) - but hey, you never know...

TIA,

-mike

TomJ · #**220** 04-16-2005, 12:04 AM

Quote:

Originally Posted by fisch

great work on this thread, VERY informative.

everything here seems to be diesel to diesel... so here goes a stupid question

i have an OM617 (currenlty with an automatic) that i would like to swap into a euro 1980 230 (M115.973) with a 4 speed manual (711 maybe?) the tranny has a cast iron case (SAE80 stamped on the side).

it looks like the OM617 will bolt up to the 4 speed manual, but i'm wondering if the flywheel from the M115 would need to be replaced with a flywheel from a diesel engine?

are there differences in the diesel and gas engine flywheels?

i'm going to guess that i will need a new flywheel (based on info from this thread) - but hey, you never know...

TIA,

-mike

Yes, different flywheel. You'll need to mark your 617's flexplate before removal and have a 240D flywheel re-balanced to the same "off-balance". Take both to an engine balancer, they'll know what to do. Just make sure they know where the mark is on the flexplate and to add the proper off-balance to match that mark (they'll mark the re-balanced flywheel the same.)

sleeeper · #**221** 04-16-2005, 02:32 AM

i have an OM617 (currenlty with an automatic) that i would like to swap into a euro 1980 230 (M115.973) with a 4 speed manual (711 maybe?) the tranny has a cast iron case (SAE80 stamped on the side).

So will the bellhousing from the gassers in fact bolt to the block of the diesels? I seem to remember them looking different?

fisch · #**222** 04-16-2005, 07:38 PM

Quote:

Originally Posted by TomJ

Yes, different flywheel. You'll need to mark your 617's flexplate before removal and have a 240D flywheel re-balanced to the same "off-balance". Take both to an engine balancer, they'll know what to do. Just make sure they know where the mark is on the flexplate and to add the proper off-balance to match that mark (they'll mark the re-balanced flywheel the same.)

outstanding, and thank you very much tom. i've located a 240D flywheel for ~$100. (in utah)

Quote:

Originally Posted by sleeper

So will the bellhousing from the gassers in fact bolt to the block of the diesels? I seem to remember them looking different?

on the 230G (M115.973) the starter is on the same side as the om617, and the bolt pattern looks the same...

i'll know more on wednesday when i can do some measurements. i may be shopping for a bellhousing soon...

mebee i can trade the auto tranny for a bellhousing as i've no need for the auto in a GWagen

TomJ · #**223** 04-17-2005, 02:39 AM

Quote:

Originally Posted by fisch

outstanding, and thank you very much tom. i've located a 240D flywheel for ~$100. (in utah)

on the 230G (M115.973) the starter is on the same side as the om617, and the bolt pattern looks the same...

i'll know more on wednesday when i can do some measurements. i may be shopping for a bellhousing soon...

mebee i can trade the auto tranny for a bellhousing as i've no need for the auto in a GWagen

$100 for a Flywheel!???!!! Yikes!!! That's WAY too much (especially considering I've paid $200 for a whole parts car WITH the flywheel, tranny, engine, etc.)

Most trannies come with the bellhousing? Why are you looking for one separately?

Jimmy Joe · #**224** 04-17-2005, 03:14 AM

Quote:

Originally Posted by TomJ

$100 for a Flywheel!???!!! Yikes!!! That's WAY too much

I dropped $125 just for a window mechanism. I wish I could find a place to store a parts car (or 3

) but sometimes ya just gotta shell out.
If the conditions were such that it would be eaiser to get a flywheel handed to you, already pulled, is that really so much? That is a lot of labor to jank, and a big mess too, no?

Mbenzo300td · #**225** 04-17-2005, 06:14 AM

Just a couple questions. I was wonderin how much your new manual tranny cost you. And i was also wonderin if you think it would be possible to put a five speed manual into a 1987 300 td.