View Full Version : Torque to yield bolts: Replace or Reuse

01-11-2014, 03:13 PM
2006 T1N, OM647, 3500, 158, SHC, cargo, single air, 150,042 miles
Getting ready to start reassembly of engine - after a burned piston engine failure. Just got the block, crank and head back from the machine shop. Kit includes new head bolts.

I have the manual, thanks to this forum. The torque specs (pages 9 - 11-16) list many torque to yield TTY bolts.
My previous experience tells me replace all TTY bolts, Is this necessary or recommended?

Head Bolts? 44ft-lb + 90deg + 90deg YES I am going to replace.
Injector hold down? YES I am going to replace.

Crankshaft -
Main Bearing Bolts? 40ft-lb + 90deg ? Necessary or Recommended?
Rod Bearing Bolts? 44in-lb + 221in-lb + 90deg? Necessary or Recommended?
Vib Damper Bolt (10.9)? 240ft-lb + 90deg? WOW! Necessary or Recommended?
Flywheel Bolts? 33ft-lb + 90deg? Necessary or Recommended?

Camshaft -
Exh. cam Sprocket bolts? 159in-lb, not TTY, but manual says "Do NOT reuse"? Replace?
Cam tower bolts (24 of them). 80in-lb. Not TTY, reuse?

Any others?

After reading many threads on the vibration damper, should I replace it? Mine is single pulley with no visible problem.

01-11-2014, 03:37 PM
replace, cheap insurance.

Aqua Puttana
01-11-2014, 03:47 PM
replace, cheap insurance.
Given the theory and design of TTY is there any other choice? :idunno:


01-11-2014, 03:54 PM
Thanks, that was my initial thought, especially with how much I am already spending, it seems fairly cheap insurance. Just another aggrevation with more parts to order and wait a few more days for.

01-11-2014, 06:18 PM
Advise---- Do NOT re-use the crankshaft/damper pulley bolt.
I have had three detach in service causing moderate damage to the crank nose.