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  #1  
Old 09-11-2009, 06:29 AM
LarryBible
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M103 Engine Balance after Adding Flywheel

I have located a really nice, low mileage 300E, but it has a problem. The problem is that it has an automatic transmission. I am contemplating buying this car and then transferring the manual transmission from my 312,000 mile 300E into this car.

The question is: What engine balance issues will I face by simply bolting the manual transmission flywheel onto the M103 engine?

Thanks for your responses.

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  #2  
Old 09-11-2009, 07:01 AM
teezer's Avatar
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have the flywheel and the clutch assembly balanced as a unit and should be good to go

remember to mark the pieces so they will line up again when installed
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  #3  
Old 09-11-2009, 12:29 PM
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Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
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Maybe I was lucky

I have an 86 with the manual 5 speed. It had a damaged valve train when I bought it, and after looking and guessing and looking as to the best repair I bought an 89 M103 from John Hef. It was hooked to an automatic. We took the flywheel from the 86 and slid it on to the 89, installed the engine and have no balance or vibration problems. It is as smooth as silk. Was I just lucky.
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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  #4  
Old 09-11-2009, 12:38 PM
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There's no need to balance anything. Benz did all that when the parts were made. I would have concern about fitting a pilot bearing to an engine originally used with an automatic, but it appears this is not a problem.
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  #5  
Old 09-11-2009, 01:06 PM
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That's true

And we did this mostly on a Saturday, maybe a year ago today, and it was late on Saturday and we realized that we did not have a pilot bearing and I did not have a tool to remove it from my engine. But we did manage to barrow a tool from a friend. With a very small puller it came right out and we re-used it.
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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!
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  #6  
Old 09-11-2009, 06:27 PM
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i swaped mine to manual, the parts were a used fly wheel a and new clutch plate and cover. i had no problems what so ever, no viabration or anything
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  #7  
Old 09-13-2009, 12:43 PM
280EZRider's Avatar
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Many years ago, I did the same thing on a 1965 Mustang without balancing anything. The flywheel, clutch assembly, and tranny came from the same doner car and I had no balance problem. So in part I agree with teezer in that if they are a unit to begin with, no balancing will be necessary.
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  #8  
Old 09-13-2009, 06:30 PM
LarryBible
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The Mustang is an externally balanced engine with a 24 ounce imbalance in a particular point of the flywheel and it only goes on in one position.

Many engines are different. Some are internally balanced while others are externally balanced.

With some of the diesels putting a flywheel on them from a different engine is asking for trouble.

It sounds from direct experience of some of the posters here that this is not a problem. I appreciate the responses. As it turns out, the car is already sold, but I may keep looking and try to find another low mileage, garage kept car.

Thanks to all.
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  #9  
Old 09-13-2009, 08:09 PM
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I have misplaced my M103 discs so I can't confirm this (the manual will say whether this is correct or not) but IIRC unlike many earlier MB engines each individual reciprocating part of the M103 engine (crank, flywheel, etc.) is individually balanced rather than balanced as a complete unit. Therefore, swapping out flywheels will not cause an imbalance issue. Mark

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