trans swap auto to stick

[flintg]

subject car: 1971 250c auto
Have found a 250/8 with 4 spd for parts. Question 1 is on how to check/change/coordinate balance the replacement flywheel to my engine. In the threads I have learned that the engine balance is achieved by counter balance on the auto flex plate and the flywheel. Any advice would be appriciated.
Question 2: I am presently cleaning the carbs on my 250c as it has set inside for 15 years while the kids were growing. All the pictures of the Zenith carbs match what the inside of carbs are but all the jets and float are labeled Solex. What up with this?????????????
Thanks for any info

[dirtyharry]

I'd be less worried about the balance then the rest of the things that need to be swapped, which may be, but not limited to, tranny, crossmember(maybe) trans mount, driveshaft may be a different length, cluch pedal assembly, clutch master/ flexible rubber line, shift linkage, interior bits.... a lot of people talk balance, unless its a diesel, I'd just slap the flywheel on that engine it might give you some weird vibrations at certain rpms but certainly as long as you're not revving to 7k shouldn't be that much of a problem. you can look at where on the flexplate the weights are attached and attempt to match them as far as where they are positioned on the engine in your car, when you go to bolt the flywheel.

as far as the zenith/solex mismatch, could be a factory thing, or someone could have replaced stuff at some point, and just mixed it.

[t walgamuth]

Originally Posted by dirtyharry

I'd be less worried about the balance then the rest of the things that need to be swapped, which may be, but not limited to, tranny, crossmember(maybe) trans mount, driveshaft may be a different length, cluch pedal assembly, clutch master/ flexible rubber line, shift linkage, interior bits.... a lot of people talk balance, unless its a diesel, I'd just slap the flywheel on that engine it might give you some weird vibrations at certain rpms but certainly as long as you're not revving to 7k shouldn't be that much of a problem. you can look at where on the flexplate the weights are attached and attempt to match them as far as where they are positioned on the engine in your car, when you go to bolt the flywheel.

as far as the zenith/solex mismatch, could be a factory thing, or someone could have replaced stuff at some point, and just mixed it.

I am sorry to disagree but the balance is critical. Most engines have cranks that balance out without using the flywheel but some won't and require balancing the crank and flywheel together. I had a 280e that was this way. To be safe you need to mark the position of the flywheel on the engine you are using, then have it checked for neutrality. If it is neutral you just need to check the flywheel you want to use and verify it is neutral as well. If either is not the new flywheel must be made to match the old one on the engine you are using. Don't skip this proceedure as if it is not neutral the imbalance will shake out your teeth.

The new flywheel and old flywheel are attached together and balanced by modifying the new flywheel, then the new flywheel is put on 180 degrees off the other on the engine. There are detailed instructions on how to do this in the factory service manual.

Good luck!

[flintg]

thanks for the comments. I have also noted that the jet sizes do not match up to the specs in my Haynes Manual. In fact the jet sizes on the top (air correction) do not match the coresponding jets (main) sizes on the bottom, so I assume someone did not pay attention to what they were doing somewhere along the line. No wonder it never purr like the unmolested 220S I grew up with.
Again thanks

[cth350]

there are like 6 different combinations of brass bits and pieces for different motors. Some US, some overseas from 1964 to 1973. You might simply have the wrong year's carbs on the car. The technical data manual might have them. The old benz engine manual has them all in a table or two. That book is on the service CD, which is a must have and economically available from the classic center in Irvine, CA.

-CTH