specs for pressure plate to flywheel bolts

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edgewood bronco
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specs for pressure plate to flywheel bolts

Post #1 by edgewood bronco » Sat Oct 03, 2015 10:28 pm

FINALLY making progress again on this build and my night is done due to a broken bolt that holds the pressure plate to the flywheel. I was trying to get them to the 32-36 ft-lb torque spec listed on the classic inlines page, but they stopped climbing in torque at about 25 ft-lb and I kept going til one snapped. Not a crisis getting it out (fortunately), but now I need to replace them because I fear I stretched them all beyond their working limit. Will a regular grade 5 bolt from the hardware store work, or shall I be looking for something more specialized?
Thanks!
62 F100 223
66 Bronco 200; autolite 2100 2 bbl conversion: Lovin' it!

drag-200stang
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Re: specs for pressure plate to flywheel bolts

Post #2 by drag-200stang » Sun Oct 04, 2015 9:46 am

18-20# The bolts are different ,any autoparts should have them. I use thread locker, but abuse my stuff.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

edgewood bronco
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Re: specs for pressure plate to flywheel bolts

Post #3 by edgewood bronco » Sun Oct 04, 2015 10:42 am

Whoops. Thanks.
62 F100 223
66 Bronco 200; autolite 2100 2 bbl conversion: Lovin' it!

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stu in wichita
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Re: specs for pressure plate to flywheel bolts

Post #4 by stu in wichita » Mon Oct 05, 2015 11:53 am

Don't use standard Grade 5 or Grade 8 bolts. Pressure plate bolts have a controlled diameter shoulder under the head which centers the pressure plate holes. Take the time to get bolts specifically made for this use. They're not hard to find.

Also, as a good mechanical practice, check the threads in your flywheel. If the over-torque stretched the bolts, it could have hurt the flywheel threads as well. If you use thread locker, use the blue Loctite, not the red.

-Stu

edgewood bronco
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Re: specs for pressure plate to flywheel bolts

Post #5 by edgewood bronco » Mon Oct 05, 2015 5:57 pm

Good point, Stu. I'll check the threads. That did occur to me as I was driving home today.
For future reference to help somebody searching the forum, these are 5/16-18 bolts. The Mr. Gasket part number is 911; ARP is 150-2201.
62 F100 223
66 Bronco 200; autolite 2100 2 bbl conversion: Lovin' it!

BobSled
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Re: specs for pressure plate to flywheel bolts

Post #6 by BobSled » Sat Aug 25, 2018 8:17 pm

The manual I have indicates that the torque for the pressure plate should be 32-36 ft-lb, but in reading this thread I'm a little concerned about breaking my bolts. What is the correct torque for the pressure plate on a 1966 mustang 200ci? Thanks!

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chad
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classic inlines 'spec chart''

Post #7 by chad » Sat Aug 25, 2018 9:20 pm

I believe its:
ci/SmallSixSpecs.html#TorqueSpecs

tech archive above (big blue bx, crossed screw driver/wrench)
(Sm 6 specs, Gen Specs, tq specs, clutch)

Correct me if wrong.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

BobSled
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Re: specs for pressure plate to flywheel bolts

Post #8 by BobSled » Sat Aug 25, 2018 9:33 pm

Thanks for replying! Yes, I found that reference too but in a Haynes manual for 1966 mustangs (for 289 not 200ci, however) I see that the torque spec for the pressure plate to flywheel bolts is listed as 12-20 ft-lbs. That's quite a difference! Not sure which one to use...

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chad
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Re: classic inlines 'spec chart''

Post #9 by chad » Sat Aug 25, 2018 10:51 pm

chad wrote:I believe its:
ci/SmallSixSpecs.html#TorqueSpecs
tech archive above (big blue bx, crossed screw driver/wrench)
(Sm 6 specs, Gen Specs, tq specs, clutch)
Correct me if wrong.


o0OOPPps - that's clutch, not F L Y WHEEL.
I c some FW bolt specs to 70FT LBS (heads R in that range).
I'll hafta deferr to others. Nuttin in the Handbook or @ CL, my 2 usual references.

ARP has it's instructions (tq secs) on line but I don't C our FW bolts listed as our FW bolts (much of what we do w/them has to B extrapolated frm prts listed 4 other engines). Must B up in the 80# range tho. I put lug nuts on @ over hundred...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

drag-200stang
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Re: specs for pressure plate to flywheel bolts

Post #10 by drag-200stang » Tue Aug 28, 2018 9:05 am

drag-200stang wrote:18-20# The bolts are different ,any autoparts should have them. I use thread locker, but I abuse my stuff.

Chad you are wrong ... This is the right answer :beer: . No not drinking beer, the above 18-20#
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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chad
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Re: specs for pressure plate to flywheel bolts

Post #11 by chad » Tue Aug 28, 2018 11:08 am

18 - 20 ft lbs it is then.
Seems very low, no?
/Or/
R U citing bolt/thread?
(I have no idea on that.)
OP sez "What tq?"...
:?:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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stu in wichita
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Re: specs for pressure plate to flywheel bolts

Post #12 by stu in wichita » Tue Aug 28, 2018 11:18 am

Sounds right on the money for Grade 8. Grade 5 would be less.

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StarDiero75
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Re: specs for pressure plate to flywheel bolts

Post #13 by StarDiero75 » Fri Aug 31, 2018 5:36 pm

My 65 shop manual for the Falcon says 25lb. Thats what i tightened mine all to. I used the PP bolts from NAPA for 289s, same size bolts. I believe they were the Mr.Gasket ones you got
--1965 Ranchero w/1966 200 and 3.03 column shift, 8" rear 2.8 (Yes I know the gearing sucks), weber 32/36, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

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