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Torque Spec for Clutch to Flywheel Bolts
#1331047 Thu Oct 24 2019 03:46 PM
Joined: Sep 2010
Posts: 184
G
Shop Shark
Hi Everyone,

1953 Chevy 3100 with 235 and original 3 speed transmission.

I'm getting the replacement engine ready for transplant into the truck and have installed the clutch cover and flywheel. I am installing a new clutch assembly and the instructions defer to the manufacturer for how much torque to apply to the bolts that mount the pressure plate to the flywheel. I've searched the shop manual, factory assembly manual and the restoration pack from GM and can not find a torque spec for those bolts anywhere.

So that's my question. What torque setting should I use when tightening down the bolts?

Thanks in advance.


Mike

1953 3100
1994 Chevy 1500 (Donated to charity 2016)


My Photobucket Pics

My Restoration Adventure Blog
Re: Torque Spec for Clutch to Flywheel Bolts
Gray_Ghost #1331050 Thu Oct 24 2019 04:04 PM
Joined: Jun 2011
Posts: 3,631
E
Shop Shark
Torque values are determined by bolt diameter, can be found on charts. Use a .375" drive ratchet, short handle, after one has twisted off a few bolts, one will get a feel.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Torque Spec for Clutch to Flywheel Bolts
EdPruss #1331071 Thu Oct 24 2019 07:07 PM
Joined: Sep 2010
Posts: 184
G
Shop Shark
Ed,

I was not aware of that. Thanks!


Mike

1953 3100
1994 Chevy 1500 (Donated to charity 2016)


My Photobucket Pics

My Restoration Adventure Blog
Re: Torque Spec for Clutch to Flywheel Bolts
Gray_Ghost #1331074 Thu Oct 24 2019 08:05 PM
Joined: Sep 2001
Posts: 30,471
ace skiver
Ed,

Was the torque setting/value based just on the bolt size (did/do all grades of bolts in the same size have the same torque valve/setting)?

Also, same setting for brass/steel/stainless?

https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx
https://www.boltdepot.com/fastener-information/bolts/US-Recommended-Torque.aspx


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Torque Spec for Clutch to Flywheel Bolts
Gray_Ghost #1331165 Fri Oct 25 2019 02:48 PM
Joined: Jun 2011
Posts: 3,631
E
Shop Shark
Of course not, different torque values for different grade of bolts, brass, Al different, clutch bolts are grade 5.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Torque Spec for Clutch to Flywheel Bolts
Gray_Ghost #1331233 Sat Oct 26 2019 12:01 AM
Joined: Mar 2010
Posts: 9,446
5
Master Gabster
Don't forget to locktite the threads to prevent oil from leaking past the threads.

Re: Torque Spec for Clutch to Flywheel Bolts
Gray_Ghost #1331238 Sat Oct 26 2019 12:17 AM
Joined: Sep 2009
Posts: 178
J
Shop Shark


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