Phaxtris

does anyone know how to remove the flywheel from a 12a? i have to swap flywheels from an 84 motor to an 81 motor (differant fly, differant clutch,..,.) but i cannot get the hue *** bolt off, i even tried a 8 ft cheater bar and no go, is there a trick to this ? please help !

Jeff20B

iTrader: (13)

Say hello to engine vibration and a dead rear stationary bearing. Who told you you could swap flywheels?

Phaxtris

hey, im ushally a chevy person, this was a favor to a friend, ill tell him to get another engine with the correct flywheel

Phaxtris

i suppose it was a good thing i couldnt get that huge nut off even with my 7ft cheater, mabye ill convince him to get a 5.0

Jeff20B

iTrader: (13)

Double post.

Jeff20B

iTrader: (13)

The reason why you can't swap flywheels is because the rotors from the later engines are lighter, and the balance weight of the flywheel matches them. If you install a later flywheel onto an earlier engine, there will be an imbalance and cause damage to the rear bearing.

Tell us what your friend is trying to do and we'll be able to give you some good advice.

A 5.0? In an RX-7? No offense, but... ah screw it. I don't find it very fruitful to try to convince a dyed-in-the-wool boinger person into liking rotaries.

Phaxtris

he just blew the motor in his rx7 (1982 12a), and he needed it swapped, so he brought the car to my place with a new engine in the pass seat (also a 12a, but a newer 12a i guesse), so i ripped the motor out, was gonna swap the clutch, and bam, differant flywheels, and because i know that the differant years have differant spline counts i know that just buying a clutch for that motor wont work because he would need a differant tranny with the matchin spling count

although, do you know if it would be possible to get a differant pressure plate and use that clutch disc, that way the spline count with match the tranny

Jeff20B

iTrader: (13)

Splines? I'm not sure what you mean. All 12As had the same number of teeth on the ring gear. Just get a 225mm clutch and pressure plate for the later engine and it'll fit fine in the tranny and the starter will work.

If the engine is perhaps an '87 or later Turbo II 13B, then the flywheel won't fit the tranny or starter.

We need more information. Pics would be helpful too.

peejay

All N/A RX-7s have the same input spline...

Phaxtris

the engine is a 12a carbed, he told me it was from an 84, as far as i knew the later (83-85) 12A'S had a larger spline count on the input shaft of the transmission, so the discs were not swappable as far as i knew

i dont know where my dig is so i dont think i can get a pic up

Jeff20B

iTrader: (13)

Only the 2nd gen cars had two different spline counts. All 1st gens were the same, so you're fine. It sounds like your friend just needs a clutch and pressure plate to match the flywheel on the '84 engine.

Phaxtris

yea, thats what i was thinking of telling him, or try to see if he can trade someone for an older engine (there is guy in our city with many many rx7's)

ill have to see if he has the coin

but thanks for the info, i thought forshure i would need to use the older clutch and fly or tell him to get an older engine

i suppose ill have to wait untill he comes by later tonight to find out the story

Jeff20B

iTrader: (13)

'83-'85 12As had 225mm clutches. '82 and older 12As had 215mm clutches.

Find out as much info as you can before making a decision.

peejay

YOUR TRANSMISSION WILL BOLT UP TO THAT ENGINE/FL:YWHEEL/CLUTCH.

Sheesh.

Phaxtris

not my decission to make, we will see what he wants to do about it, its his cash and his car

MicahMan

i did that and you take the nut off and use a flywheel puller and pull it off the put other flywheel on and torque down

Jeff20B

iTrader: (13)

So what did your friend decide to do?

jimmyjoejoe

here's how to get the flywheel off
get a 600 pound gorilla with a half inch drive impact wrench with a 58 mm socket and have him work on it for a day or two



my advice, keep the motor/flywheel/clutch together. i'm running an 84 motor in my 79, just swap manifolds over. it'll happen just right. oh, btw, be careful with the oil coolers!!!

Jeff20B

iTrader: (13)

Now some newbie's gonna go buy himself a 58mm socket and it'll be all sloppy on the nut.

iyaseven

how i got my fly wheel nut off was to take a 2 1/2 in=55mm socket with a short breaker bar attached. place a oem jack between the car frame and breaker bar handle and turn, easy. but that won't work on the one engine out of the car already.

Jeff20B

iTrader: (13)

Just for future reference, the correct size is 54mm but 2 1/8" works fine.

GavinJuice

I don't know why but i laughed so hard when i read that. haha

iyaseven

thanks Jeff20b, i just finished a clutch job last week. 54mm=2 1/8th, right on.

faye x7

yeah...same here...