NV5600 to Engine Torque Specs

[BMancin]

I replaced the clutch on my '03 with a South Bend DD. My factory Dodge manual does not publish a torque spec for bolting the transmission to the engine. I checked in the NV4500 section and for transmission to engine, it states 80 ft. lbs. Is this correct? Seems too high. I started tightening to 80, and it just does not feel right. The bell housing is aluminum, so I do NOT want to strip the threads. The bolt looks like about a grade 8 steel. Anyone know the the correct torque?



BTW, the NV5600 looks even bigger out of the truck. It is truly a monster. For any of you do-it-yourselfers, be advised, this beast weighs 490 lbs. It can kill you if it falls on you. DO NOT USE a cheap transmission jack. Our jack actually started to fail on us, even though it was rated @ 1K. Good thing we had the transmission already bolted in already.



I have included some pics.



Thanks, Bill

 

[rbattelle]

Did you resurface the flywheel? Replace the pilot bearing?



Sure enough, the service manual doesn't list the torque. Unless maybe "Bolt, clutch housing" is the right one? Not likely... that's probably the clutch housing-to-transmission case bolts.



You'll probably have to determine the size and grade of the screws and use something like Machinery's Handbook to determine an appropriate torque.



-Ryan

 

[Jeff_K]

Ryan, I think the SBC DD clutches come with new flywheels/bearings.



I can't remember what I torqued mine to when I did my clutch. I am pretty sure it was nowhere near 80ft-lbs, more like 25ft-lbs or so. I will see if I can find my notes... .

 

[rbattelle]

Ryan, I think the SBC DD clutches come with new flywheels/bearings.

Ah yes, that would make sense...



-Ryan

 

[KDillard]

drooling

Cant wait to replace mine in 60 k miles. How much was it?

 

[BMancin]

Cost was around $1600. That includes PP, double disks & plate and flywheel. It's really a thing of beauty. I also purchased a replacement slave cylinder which reduces the clutch pedal pressure. Peter at South Bend is really a great help. You should give him a call when you are ready.

 

[nickleinonen]

is the engine flywheel housing adapter the same used in the nv4500 and nv5600? if it is the same, the torque spec would be the same also i think? so the flywheel housing is aluminum. are the threads cut into the aluminum or are they an insert or helicoil?

 

[BMancin]

That was exactly my logic. Under the NV4500 section, it states 80ft lbs for transmission mounting bolts. Problem is, I am not sure if the NV4500 uses the aluminum adaptor. Not sure if they use a heli coil. After 35yrs of wrenching, you get an intuitive feeling when something is not right, and that is the case here. Either way, I torqued bolts to 40 ft lbs with thread locker. Thanks, Bill

 

[jwilliams3]

The trans adapters on your Cummins is aluminum with no helicoil.

 

[KDillard]

I think you are inquiring about the clutch or BELL HOUSING BOLT torque which is 35 ft lb as stated in the torque specs in 03 factory service manual

 

[rbattelle]

I think you are inquiring about the clutch or BELL HOUSING BOLT torque which is 35 ft lb as stated in the torque specs in 03 factory service manual

What page? I can't find it.



-Ryan