bhoff1175

Did a search and found 2 different responces for flex plate torque.
Is it 55 ft lbs or something else? just want to be sure.
TIA
BRYAN

OBTW .... Cummins superseeded the 2nd gen plate to part #3975464
The only difference I can see is that they shot peened the center
area. The thickness is the same, maybe the strength of the steel is
greater?

KAyers

I just replaced my flexplate with a 2nd gen one yesterday. I layed them side by side and couldn't see anything between them to lead me to belive the 2nd gen is any stronger. There is nothing obvious to the naked eye at least.

wannadiesel

101 ft. lbs.

Allnew2me

I just changed mine a few weeks ago and the shop manual for my year says 55 ft lb. I used that value with loctite.

timb

The only differnce there is between the two is the second gen is shot peened. this does prevent the metal from becoming fatigued and cracking.

sdstriper

Shot peening will make the steel much stronger.

1989 FSM torque specs:

Flywheel - 101 ft/lbs. (This I believe is for manual transmisions, although all other manual transmission torque values are noted)

Transmission Mtg to Engine - 30 ft/lbs
Transmission Torque Converter Mtg - 35 ft/lbs

The "flexplate" is not even in the FSM Diesel Supplement. However there is a Capscrew Markings and Torque Value Chart, and it notes that you are not to use said chart if values are specified otherwise in the manual. If you really want the value I need to know what size are the bolts and what grading are they. There are Seven different Thread Diameters and Three different Grades of Metric bolt here.

I cannot imagine why the flexplate torque value would be different than the flywheel. Same bolt holes, bolts may be shorter though.

sdstriper

CORRECTION, Sorry and Thank You janb! I really appreciate the effort that people put forth on the various forums online, that being said I like to contribute, I do occasionally make mistakes, no harm intended.

I did not find any reference to a Torque Value for the Flexplate in my FSM, only the Flywheel. I did find a Torque Value chart and proceeded to post the values for the three types of bolt but for the incorrect size, my mistake and once again Thanks to janb for pointing that out.

The Cummins Part Catalog shows flexplate bolt to be a M12 - 1.25 x 16mm
and the flywheel (manual transmissions, longer bolt M12 - 1.25 x 32mm)

So the 101 ft/lbs should be correct, someone please chime in if I am not thinking clearly on this...

Bolt values based on clean dry threads. Reduce those values by 10% if lubricant is used and 20% if new plated capscrews are used

This information is right out of a 1989 Factory Service Manual Diesel Supplement and 1989 Cummins Part Catalog for the 250/350 Chrysler Pickups

janb

Careful here
specs provided note 16mm Dia bolt ( in 3 grades) and the bolt specified for application is M12 (1.25 pitch x 16MM in length) = 12mm Dia !!! NOT 16 MM

Length is noted as 16mm, but... the bolt will break across Dia (which is actually 12MM dia of meat MINUS - the depth of thread x 2, so closer to 10 MM Dia meat (that is ALOT less than 16mm in cross sectional area !!)

sdstriper

Good heads up here folks, sorry about that...

cLAYH

When I replace the Flywheel on my '92 with a 2nd gen unit, the 2nd gen unit was heavier than the original but otherwise looked exactly the same. I bought mine directly from Cummins.