PVerdieck

OK. Doing clutch and flywheel job on FD. Act flywheel and spec clutch. Was tightening up the ACT bolts provided for bolting on to the counterweight.

The pieces of junk stretched. I was using a torque wrench with clicking/popping for set torque. It was tested on a wheel nut and worked.

So now I need to find a source of high tension bolts to use.

Will the automatic flex plate bolts work? Are they long enough?

If not, what are my options? McMaster-Carr?

I was attempting to torque to 76 lbs (low side listed in manual for attaching bolts to drive plate).

This blows.

Randman

McMaster should have some good stuff, you could also try Ababa Bolts.

twokrx7

iTrader: (1)

That's very weird. What torque value were you using?

PVerdieck

As I said, we used 76 lbs.

That is the low value, specified on page K-157, auto trans, drive plate attachment, torque 76-81 lbs.

I will call APR tomorrow, to see if they over M10, 1.25, .75 shank length bolts
I will also go to the dealer, and see how the stock auto trans ones look.

Mahjik

iTrader: (1)

I'll need to look again, but I don't remember those bolts being torqued that high. Usually those size are around 40-44 ft/lbs.

Matt Hey

I agree with Mahjik. I think the torque spec should be about 40 ft/lbs. Another place for bolts...

http://www.boltdepot.com/

Be sure to get 10.9 grade bolts.

PVerdieck

40 lbs? Holding down a 12 lb flywheel on one side and a X lb counterweight on the other?

We were also using blue loctite on them.

PVerdieck

n/t

Mahjik

iTrader: (1)

Considering the engine studs themselves are around around 28 ft/lbs stock, yea that's about right.

IIRC, my Racing Beat FW had all the torque specs with it and I know they weren't that high (70'ish that is). Heck, the bolts for the pressure plate are only like 20 ft/lbs.

KevinK2

My RB flywheel instructions said 28 ft lbs, with lower values for the pressure plate.

28 ft-lbs gets you about 5000 lbs preload per bolt at about 55 ksi stress. Gr 8.8 has a min yield of 96 ksi.

I thought there were (6) M10 bolts ... that would be 30,000 lbs of clamping force. Sounds like enough ....

Over torquing with mega strength bolts could strip the tapped holes.

Mahjik

iTrader: (1)

That sounds about right (although I used around 30 ft lbs). Glad you had the RB instructions handy.

KevinW

iTrader: (1)

so when bolting on a LWFW each bolt should be torqued @ about 28lbs?

PVerdieck

OK, I buy what you guys are saying. I also called Jason, and the tech at his shop is using 28-30 lbs.

IN OUR DEFENSE:


P. K-157

KevinW

iTrader: (1)

so why does that say 76-81 lb

Mahjik

iTrader: (1)

Because it's not exactly the same parts. Those doesn't always transfer over to aftermarket parts (as I found out with my strut replacement one day ).

I'm surprised ACT doesn't have a sheet with torque specs with their flywheel/counterweight bolts like Racing Beat.

KevinK2

http://www.iluvmyrx7.com/

both 93 and 94 manual pdf's spec it at 32-44 ft-lbs

could be fsm error, or wrong fsm?

PVerdieck

must be a FSM error.

from my 94 RX-7 Factory Workshop Manual, copyright 1993.

KevinK2

in my 93 fsm, right on pg C-81, wrong on K-157.

PVerdieck

C-82 correct for me. Thanks.

ArcWelder

I guess not exactly wrong on K-157 as that is probably the correct torque spec for the drive plate with an automatic transmission. It's not the correct flywheel/counterweight torque spec for the manual trans.

Anyhow, for replacement high quality hardware I use Maryland Metrics.

http://mdmetric.com/

KevinK2

the manual flywheel and counterweight are one piece, no 6 cap screws means no torque spec. K-157 refers to atx, and is wrong.

Hyperite

I did 45 ft/lbs for my ACT SS

ArcWelder

Yes, got your point. Manual is conflicting on torque spec for auto trans from C-81 (corrrect) to K-157 (incorrect). No torque spec stock, man trans vs. aftermarket seperate flywheel and counterweight so use correct torque spec from page C-81 for auto trans.

jdtanksley

I went throught the same thing when I swapped out my clutch and flywheel. I found out the hard way that the specs listed at not correct. I found the same picture in two different places in the factory manual, each having very different numbers. I think someone got confused about which numbers they were starting out with in that particular picture when they were doing their N-m, kgf-m, ft-lb conversions.

ACTman

Just to confirm the numbers you were using are wrong, we suggest 45-50 ftlbs. There is no way they would use 80ftlbs for 10mm bolts so it must be an error. The bolts provided are grade 10.9 which aint bad. I thought there were instructions with torque specs provided, but if not, I apologize.