Ok, I got a new 7 this week, its an s5 na, its really nice. but it needs a clutch, I ordered the rotory performance standered clutch set and it will be her monday. so I started pulling the tranny, I finally got everything out (by myself, never done anything like this before) tranny is out and pressure plate and clutch disk, now im at the flywheel and im looking at a really big nut, what size is it? I was told 2 1/8'', but I figured it would be metric???? Anyway, Im gunna go buy the socket tommmarrow. How do I stop the flywheel from turning when I untorqe the nut from 350 ft/lbs ( According to the same sorce) is there anything else I need to do/ replace while im there? any tips would help greatly, thanks alot

-Adam

87' se 119,xxx(pretty beat up)
89'gxl 68,xxx (pretty perfect)

 

The nut is 54mm.
You can get a flywheelstopper from your local mazda dealer or maybe borrow it for a price. Eccentric shaft nut breaker bar NO.:490820035
And Ring gera brake NO.: 49f011101
Good Luck

 

thanks sooo much, hopefully Ill have it up and running within the week. Thanks again -Adam

 

No problem

 

yeah they are on ridiculously tight

they are a 52mm (2 inch) but a 54mm although a bit sloppy will undo them. to lock the flywheel just get a valve outta a piston engine, heat it halfway up the shaft and bend it to a right angle, put it in one of the bell housing bolt provisions and she'll be sweet as..... done it before

 

Get a crow bar (or anything hard that is made of iron, it wont bend), jam the flywheel. Then get an air gun that kicks out 400ft/lbs and go hard

 

I have a 54mm socket also and its not perfect but it will spin off the nut..... hopefully

 

It is a 54mm nut, not 52. However those sockets (especially impact sockets) are hard to find other than at Snap On or Mac Tools or something. The 54mm impact runs about $65, which is why a lot of people use a 2 1/8 socket from Sears-- about $28 if I remember correctly. Not impact, but for the frequency of use it may work just fine. That size is a bit sloppy though, so if you anticipate doing this a few times it's probably worth buying the right tool.

On the flywheel stopper, Mazdatrix has a newer bolt on stopper that sure beats that old bracing bar they used to sell. You can find it on their website.

Good luck!

Greg O.

 

Well im going to an industrail tool place to day to get a 54mm, and a big *** breaker bar. and go see if i can rent the tool from mazda, there is a dealership right next to the tool place. Thanks again.....................Im scared haha j/k

 

cant you also get a flywheel torque multiplier? Ive seen them before, they have the socket that fits over the nut, then the thing goes out to the teeth on the flywheel and has a really small gear (where you attach your wrench of whatever size) and then crank it clockwise. it multiplies the torque b like, 9 times or something crazy like that, and it keeps the flywheel from moving.

 

here even scanned a pic

 

Hey,

Check out Madzatrix. They have a wrench that will do the trick for $36.

www.mazdatrix.com

 

Ok, this is really frustrating, and I apriciate all the help, cuase it does help! ALOT!!!! but damn I got a 2 1/8 socket, I had to rent one.. and I barrowed a 3/4 inch drive from a friend. I riged up this thing that bolts from the flywheel to the bellhousing, and the metal i used bent and snaped. so im gunna try and make a bar like the one on mazda trix. Im going to home depot in a few....... Thanks again you guys

 

If you can't obtain a impact wrench with enough oooomph, you may want to go ghetto. Best tool I have is the 20lb sledge hammer (20 bucks, hardware store). It does the same thing a impact gun/wrench does, and works fine. If I did this for living I'd buy a good DeWalt etc, but seeing as how I only need one once or twice a year, the twenty lb is cost effective. Has multiple uses also. That nut is on good. Should have been installed with locktite.

 

I used this from mazdatrix.com

Then I used a 4 1/2ft long breaker bar, a 54mm socket and I sat the engine in a very big mechanical vise and popped it off. I'm an aircraft so I took my engine to work and did it. Just got done 45 minutes ago.

 

How did you re-torque it to spec (375 ft lbs) accurately?

 

Just a heads up, this thread is eighteen years old.

The proper way would be to have a flywheel stopper installed, and a torque wrench capable of reading the 375 ft-lbs. Though I suspect many people take an impact gun that is highly rated (probably 400 ft-lbs~) and torque it on there, though without a torque wrench, you have no real way of knowing how well it is on there, which I'd advise against.

 

Like was already stated, this quite the old thread, but i use an impact and air compressor and give it many udga dugas

 

The engine must be bolted to a bench or stand thats fixed to the ground to achieve proper torque on the flywheel nut. 375 ft/lbs is a lot of torque. I've seen flywheel stoppers break so care must be taken to ensure its bolted on correctly and that its a good serviceable tool.

 

These are words worth remembering.

 

Divide 375 by your body weight and let your breaker bar support your weight at that length in feet, with the bar parallel to the ground.

 

You don't need to re-torque it accurately. The torque is just to press the flywheel onto the eccentric taper.

Hand tighten the nut down as much as you can with red-Loctite applied.

Mark one of the nut points on the flywheel with a Sharpie.

Mark a point on the nut one left of the mark you made on the flywheel.

Turn with impact until the point on the nut lines up with the point on the flywheel (60 degrees).

That's about 400 ft-lbs.

Done.