flywheel

[maabus03]

I got a 73 240z auto that I'm converting to a 5 spd. I got a flywheel from another 240z, don't remember year.

The problem I'm having is the flywheel won't fit onto my 240z engine. I don't know the exact name of the part it bolts onto but i'llt ry to explain it best as I can.

Coming out of the crankshaft, there's that round piece that sticks out a little and that the flywheel is suppose to fit into and bolts onto. Heres my problem, is the round piece that its suppose to bolt onto, is too big to fit the flywheel. Friend of mine called the MSA tech line and asked them about it. They said the crankshaft was different on some of the earlier cars and that the only thing I could do was swap the engine or change the driveshaft. Neither of which I want to do or go back to the automatic because i've already payed for all the parts for manual ( master/clave clutch cyl, clutch assemblie, ect). I haven't seen any flywheels that have the larger ?slot? that would fit the larger crankshaft.

Woudl anyone know if it would work to have a machine shop make the slot that the crankshaft fits onto larger? It would only need to be made bigger about quarter inch bigger. If it was made exactly same size as the crankshaft so it fitted on there, would that work and not dmg the clutch or make the flywheel not perform as well?

Sorry I can't explain this better. Any suggestions are helpful and appreciated. Have talked to a machine shop that said they can do it.... Just need to find out if that'll work or not. If you need better explaining, i'll try my best.

thanks

[Bambikiller240]

I encounterd this a very long time ago. I ended up having the center hole in the flywheel enlarged to match the crankshaft. I used a micrometer to measure the size that the hole needed to be. Also, I was very worried that I'd have balance/vibration problems after mating the flywheel with the larger hole to the crankshaft. Turned out that I had no problems, but I think I was very lucky in that regard.

[Phred]

Yes this can be done by a good machinist. However, he will need the EXACT dimension of the back of the crank, Meaning to the last thousanth of a inch. This is important as the flywheel must be a perfect fit over the crank flange to assure that the flywheel has no runout that would cause an imbalance.

Phred

[Bambikiller240]

Hence the need for a micrometer to make the measurement.

[maabus03]

Thanks for the confirmation. Just gotta get the exact measurement. Planning on getting it done tomorrow morning. Having the different crankshaft, would that affect the transmission in any way?

[Bambikiller240]

Do you mean different flywheel? Answer would be no, since it doesn't come into contact with the trans, and you will be using the same clutch disc, pressure plate, etc.

Just remember to use the 5 speed clutch disc, p/p, clutch fork, and throw out bearing collar, etc.