Rebuilding 240D Engine - Flywheel Balancing Question

[dave1shere]

HELP!!!

I am rebuilding a 240D engine. New pistons, rings, bearings, etc. Have got to the point where I am putting the flywheel on. When reading my MB Shop Manual, it mentions LINING UP MARKS ON THE CRANK SHAFT AND THE FLYWHEEL.

I see a mark on the flywheel but cannot find even a hint of a mark on the crank shaft. One problem..is in order to rebuilt this engine I had to use some parts from another engine. This is not the original crank shaft, but from a donor engine. I am using my original flywheel. In reading my manual it talks about balancing flywheel to flywheel if you are to use a new one but obviously I don't have the flywheel to do that nor the tooling...

My main question would be....

Am I making to big of a deal out of this???

I have the engine all put together and don't want to take the crankshaft back out.......but there is good machine shop in my town, should I have them check the flywheel and neutrally balance it...

Or in anyones experience, have you just put the flywheel back on possibly with the engine at top dead center and made an educated guess on where it should be installed????

Thank you and ANY help sure would be appreciated...

David