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  #1  
Old 06-14-2006, 07:35 PM
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Smile Picture of flywheel / crank marks?

Hi,

I just transformed a OM617A (300tdt) to manual and brought the auto (flexplate) 'flywheel' to a balancing shop. It was 13 grams off balance. I let them transfer the inbalance to a used manual flywheel of a OM617 from a mercedes-G jeep. They had to remove 28 grams of iron to make it in the same inbalance as the original flexplate.

Does anyone have a picture of the factory marks that should be on the crank or the flywheel? I made my own marks but i can't figureout what should be the factory mark.

Cheers!
Floris Hermans
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  #2  
Old 06-14-2006, 07:57 PM
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Look at the picture in post #73 in this thread
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  #3  
Old 06-15-2006, 09:42 AM
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The maintenance manual has a picture of it, though not good. I've checked mine several times & finally discovered a faint mark like the manual says where it should be. Like from a wide magic marker near where the pilot bushing goes into the crank & onto the flywheel. Paul.
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  #4  
Old 06-19-2006, 05:46 PM
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ok i found one mark on the flywheel and one mark like made with a black marker on the crank. The mark on the flywheel is a black line. The strange thing is that they are not on the right place (if i compare them to the marks i made myself) The original mark on the flywheel is 4 holes to the left. When i put the original flywheel 4 holes to the right (to align the original marks) i see that they don't really align. (when i look from the front the don't really match, link 0,5 cm in between) So im confused what i shall do. I think just place the imbalanced flywheel back the way he original was. Maybe they replaced the auto flywheel before?

cheers,
Floris
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  #5  
Old 06-19-2006, 08:32 PM
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if you have followed the directions correctly you should be able to put it back on according to your own marks. if the fw was correctly placed before you started. did the car idle smoothly?

on my 84 euro 280 we found very faint marks between the bolt holes. an ellipse with a double mark that looked more or less like a deer track. a split oval with rounded ends.

almost not visible with the naked eye.

tom w
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #6  
Old 06-19-2006, 09:25 PM
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I am almost starting to wonder if there might be a metal dye useful to highlight the marks that are almost invisible or are invisible to the human eye on the factory cranks especially. The grain of the metal has to be altered by the original striking of the mark I would imagine. As Tom mentioned if your engine ran fairly smooth with the old flexplate I would not hesitate to put your modified flywheel with it"s now matching imbalance on your own marks. Seems the only sensible thing to do at this stage.
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  #7  
Old 06-20-2006, 05:45 AM
t walgamuth's Avatar
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a dye probably exists that would highlight the marks.

the one on the end of the crank was so faint it looked like a hologram. simply amazing. if i hadnt seen it with my own eyes i would never have believed it. .. never.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #8  
Old 06-22-2006, 05:46 PM
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Smile marks

Thanks for the reply's.. I put the flywheel back just the way it was, and the engine appears to be runnig OK.

The thing i can tell is that the marks FOR SURE didn't look like the one in the picture in post #73 of the Thread R Leo told. This one looks more triangular. On the crank i found 2 things. One looked like a mark (a bit darker stripe like made with a pen or pencil) and a VERRY tiny mark that was like a small 'pinch' in the metal made with a tool or something. In the flyeheel i found also some mark that looked like a mark made with a pencil of pen (dark black stripe) i couldn't remove it with cleaner or wax or whatever. this mark marked right up with the tiny (1 mm) pinch on the crank.

I thought maybe the 2 pencil like dark marks should have matched and for this reason i thought the fywheel was maybe installes wrong before. But when i put the auto flywheel in the spot where it would align the 2 pencil stripes they didn't align nicely, about 1/2 cm difference. So i figured probably it is made by oil or whatever... Jus pt it back the way i took it of and evrything seems to be ok..

Should the marks be ON the metal (like some kind of ink) or should they be scratched IN the metal?

I put a picture here:

http://www.floriz.nl/marks.jpg

Cheers!
Floris
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  #9  
Old 06-23-2006, 11:16 AM
t walgamuth's Avatar
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on mine, the mark on the fw was pressed in slightly. the mark on the crank looked like a hologram.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #10  
Old 06-27-2006, 05:16 PM
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anyone else can discribe how their marks looked like?
cheers. Floris
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  #11  
Old 01-08-2010, 12:22 AM
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BTT for this old thread. I am putting a 617 into a Toyota pickup (yes it is a shoe horn). www.4x4labs.com is finally done with their adapter and it is ready. I'll use their adapter to mate it to GM and then an Advance Adapter to bring it to the Toyota transmission. The 4x4labs adapter includes a custom flywheel designed for the 617 that uses a GM clutch but you must get it balanced yourself. Upon inspection of the Benz flywheel (I wish I had my camera) clearly it is drilled for balance and marked with white paint. It is a low mileage engine that was only messed with by Mercedes Benz but interestingly two bolts are painted white and then they were removed and placed elsewhere. (Again I'll post pictures later). It is interesting.

thanks,
Andre
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  #12  
Old 01-08-2010, 12:32 AM
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13grams is not a lot of imbalance-
FWIW, I am working on an ancient lathe that was once run by an overhead belt system. In the web of the upper pulley are 8 3/8" drilled clear through the 1/2" cast iron. This is to balance it, it might seam like a lot, but it's balanced now.
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