sheared flywheel bolts

**k3500les** · 01-05-2010, 11:47 AM

So i have a 94 chevy k3500 6.5 4x4 standard tranny. I have replaced the dual mass flywheel with a single flywheel . I got it together drove it ten miles er so .Than i sherd off the bolts that hold the flywheel to the crank . Everything bolted up nicely . I am confused what may cause this .

**Viper** · 01-08-2010, 10:07 AM

incorrect grade of bolts, or tensioner to tight

**Crawdaddy** · 01-08-2010, 08:55 PM

changed thread title to something more descriptive

**tbplus10** · 01-09-2010, 09:02 AM

This is the same truck you had earlier clutch issues with right?
The quality and grade of the fasteners is what comes to mind first.

**Greg84** · 01-11-2010, 11:26 AM

Were the original bolts torque to yield bolts that were reused?

**Jimmiee** · 01-11-2010, 11:31 AM

Please explain the method you used to install and tighten the bolts? This will help to find the cause of the failure. I have been in the transmission business for 38 years and I'm here to tell you this is the second time I've ever heard of this happening.

**NORMSCOLORADO** · 01-11-2010, 10:31 PM

i thought that you needed tha dual mass flywheel no matter what.....

**Jimmiee** · 01-12-2010, 11:13 AM

Originally Posted by NORMSCOLORADO

i thought that you needed tha dual mass flywheel no matter what.....

The dual mass flywheels were a good idea and they did smooth out vibrations. The problem with them is they don't live. The bearing between the 2 wheels fails as do the springs and small parts. So the solution is a conventional flywheel which lasts much longer although you do have vibration and rattle that most diesel engines have.

**k3500les** · 01-18-2010, 12:58 PM

Well fella i sold the old girl but i installed the flywheel first and i just tighten the flywheel bolts as tight as i could get them . After fruther inspection at a real garage and they said that the bolts i had in were not long enought he said they were barely in the crank after some new grade 8 bolts and longer ones it seems to be running like a champ a little low rpm vibration but only on take off .$1000 later . i probably should have check that out and tourqued em down ?!