Rod cap bolt question

[turboman1]

Rebuilding the motor on my 97' and when torque the rod bolts from 50 to 73 ft lbs the bolts seem as if they are stretching. They turn about a 1/4 turn from 26 to 50 but from 50 to 73 they turned over half a turn and still didn't make the torque wrench click. Are the rod bolts only supposed to be used once and are stretched during that time. I checked two different manuals and both said 73 ft lbs. Anyone think I am stretching the bolts or over torquing them?

Thanks
Adam

 

[Bponci]

Replace them. On a side note check your torque wrench accuracy.

 

[turboman1]

Thanks, we did check the torque wrench to make sure it was still working (not calibrated though) and it still clicked.

I think I am going to buy new bolts anyways. Where is a good place to purchase a new set?

Adam

 

[turboman1]

At what point should I switch to a higher grade bolt or stud? I'm looking to make 700 hp

I saw pure diesel power had both stock cummins rod bolts and some higher grade material bolts from ARP. Cummins Heavy Duty Rod Bolts 89-07 Dodge 5.9L Diesel by ARP

Also what about main bolts. Should I switch those to studs or just leave the original bolts?

 

[blos101]

I thought rod bolts were suppose to be torqued to 90 ft/lbs. Maybe thats just for the heavy duty ones... I would put upgraded ones in there now that way you don't have to worry about it, I mean its already torn down so you might as well.

 

[Bponci]

If you change rod bolts you had better have the rods checked. When you change fastener with higher torque values its always best to have them checked under torque.