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#1
12-07-2012, 08:55 PM
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Doing An Engine Swap And Got A Question (Flywheel)
Hello Experts!
I am installing a low mileage 240D engine that came with a manual 4 speed trans. I am pairing this engine with an auto trans. I have all the components that are needed for the job but was wondering about the flywheel that I have to use with the auto trans. My question is with regard to balance. If the flywheel is supposed to be balanced with the crank then how do I accomplish that or are flywheels balanced independently? Also, I will have a manual trans and flywheel available once I am finished with this project. PM me if you may be interested in them. Kevin 
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#2
12-07-2012, 09:02 PM
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be sure and list the manual trans/flywheel in the parts for sale section of our forum.
some flywheels are neutrally balanced, some are not. clean really well around the crank mounting section, and look for two tiny marks. dots really... the alternative, is to mark the crank, and the manual flywheel, then take both the manual and the automatic flywheels to a machine shop to have them match balanced.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
12-08-2012, 11:03 AM
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I wouldnt' think a flywheel from a 4-cylinder engine has anything other than neutral balance. The engine has perfect primary balance unlike it 5-cylinder counterpart.
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'83 300D, 126K miles.
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#4
12-08-2012, 11:06 AM
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I am under the impression that the factory service manual says they all need to be match balanced. Can anyone confirm or deny this please?
I have changed out five or six, some five cyl, some four and my 280e six. So far the 280 was the only one not neutrally balanced.
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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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#5
12-08-2012, 02:31 PM
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My experience has been a bit different than that of T-Wal; although the piston and rod assemblies are matched, the MB inline crankshafts are not neutral in themselves (the V8s are). As a consequence, weight is carried externally, both on the front hub for the torsional balancer, and on the flywheel. Hence the replacement flywheel, either manual or automatic, must be matched to the imbalance of the original.
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#6
12-08-2012, 03:02 PM
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My experience with swapping 616 engines has been,.. if nether the f/f or crank have witness marks they have been balanced independently. Following this in several swaps I have only seen one with witness marks where I had both crank and f/w balanced together.
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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