help!!! Messed up thread on E-Shaft
 

Help......I am in the middle of swapping out a stock flywheel and installing a lightweight.
I guess when I pulled off the old flywheel I must have let it hit the end of the E-shaft where the nut threads on and messed it up.
I can't thread the nut back on more than halfway.
About 3 lines of thread are slightly damaged about 1/8 of the way arounf the nut.
So iguess when I knocked the flywheel loose it fell on to the shaft............Dammit I didnt notice though.
So I tried to get it to go back on with my under powered air impact wrench but with no luck.
I dont want to keep trying and mess it up more so does anyone have any experience with a stupid problem like this before I go on with it.
I really don't want to pull the motor apart to swap the E-shaft and have to buy a gasket set, I just don't have the time.
Help!!!!!!!!!!!!!!!!!

yeah...
 

umm i think you can buy a die set that you could re do the threads...im new to this rotary thing so i dunno if im right or not about the threaded part. Just bring the nut or whatever to a store and get the threads measured to see what pitch it is and ask for that thread pitch in a die tool to rethread the shaft.

A die that size might cost you a bit. I'd go in there with a thread file and clean things up.

I think the file idea is pretty good.

A good machine shop might have a die big enough they could run down it for you, thats the route I would try first. But the thread file sounds like a good idea too.

~T.J.

that would work too forgot about that one....

I use a triangular face file when I make boo boos like that. Time and patience is all it takes.

Those can work rather well when a thread file is not available. I have even resorted to using an old hacksaw blade to clean up damaged threads. That takes lots of patience, and a careful hand. A thread file is much more forgiving, but also slower, as it works on a wider area.
Inspect the nut for damaged threads, since you have already tried to run it down. If any damage is evident, replace the nut, or you could damage the e-shaft even more, once you have corrected the threads.

thanx for the info everyone........I was going to try and get a die in the morning by sizing it up at a shop with the nut. but I know they aren't cheap......
I think I will try the thread file.............I am rather patient and careful......I have been building model cars as a hobby for some 10 years now......hahahah......it better pay off......I'll keep the thread posted on what happens.

Yea thread file all the way. You'll use it more than once too.

The other thing is a "thread chaser" which works better than a die. I keep one in the toolbox for sparkplug holes and it works very well.

B

Yep...I cleaned mine up with a thread file...worked like a champ!

Good luck!

Rich

cool

ok it's done and good.
I didn't want to spend the money on a die since it was more than a tank of gas for me out here in Los angeles......hahahha...
So I had a couple of extra E-shaft nuts......
I inspected the damaged threads and I hadd seen worst in the past so I decided I would run the nut on and of till it got all the way on.
It took just over an hour of carefull throttling of the impact wrench.
I just drove it on then backed it off several times, inspecting after each turn to make sure it wasn't doing more damage.
The nut was not getting cut into so I knew it wasn't to bad.
and finally I got the nut all the way on.
I removed it and inspected each thread line carefully and none of them seemed to be shortened or cut off.
So I think it was successfull.
I can thread the nut almost all the way on by hand with very little resistance.
SO I think we are good to go.
I reinstalled the flywheel, carefully this time, and used a fresh nut.
She is all done but now she wano't start..........
check out my other plea for help thread.....
https://www.rx7club.com/1st-generation-specific-1979-1985-18/wont-start-help-1984-12a-rx7-439496/

thanx