[u00bse1]

03 Duramax with Allison. The flywheel to crank mounting bolts, the 8 14mm allen, the torque is

Tighten the flywheel bolts in the proper sequence. Tighten
1st step 79 N·m (59 lb ft).
2nd step 60 degrees using J 36660-A .
3rd step 60 degrees using J 36660-A . .

I have a 3/4" clicker torque wrench and am getting 350 lb ft on the bolts and still need the last 50 or so degrees. Is this possably right? I am wondering about breaking my torque wrench or even worse, these bolts. That would ruin my day for sure. Who has done these before. Do you know about what actual end torque value these fall at? I am having a hard time believing these bolts and crank threads can take this.

Thanks.

 

[TheBac]

Just helped Eric (dmaxalliTech) put his engine together on Saturday.....He's the gorilla that installed the flywheel bolts. We just torqued to 79 ft/lb, then two 60*turns, the last of which is fun as heck. No idea what the torque was. You need to have a flywheel lock to do it right.

 

[Diesel Tech]

Have no idea what the final torque value is but I have put them in and followed the factory tighten sequence. I use a tool that holds the flywheel from turning, 3/4" bar with a piece of pipe on the end. Then pull like hell froze over. So far so good but it sure seems overkill to me as well.

 

[u00bse1]

I have the flywheel locked, that's the easy part. The motor is going to have to be chained in place on a beam to keep from moving for me then. Then I need to enlist the help of a friend who weighs twice what I do I guess. Sure hope the bolts and tools take that force. I doubt my angle meter will, just have to use paint marks on the bolts and flywheel for ref.

Thanks guys!

 

[MaxFarmer]

Dont use your Torq wrench for the 2 60 degree turns either, you very well could break it. I did like Diesel Tech said, 3/4" bar with a LONG pipe on the end. The motor rocked on me some, but it will stop eventually. I had to do them by myself on a creeper on the shop floor! Talk about needing your wheaties!

 

[TheBac]

I have the flywheel locked, that's the easy part. The motor is going to have to be chained in place on a beam to keep from moving for me then. Then I need to enlist the help of a friend who weighs twice what I do I guess. Sure hope the bolts and tools take that force. I doubt my angle meter will, just have to use paint marks on the bolts and flywheel for ref.

Thanks guys!

Since the bolts are 6-sided, every flat is 60*....we just marked the flywheel and turned the bolts to the next flat, twice each. Sounds stupid, but it worked. I agree...don't use a torque wrench....use a 3/4" breaker bar.....1/2" bar will do it, but you should see how it bends on that second turn.

Farmer, how the heck did you do that on the floor with no leverage point?

 

[MaxFarmer]

Bac, I used about a 4' pipe over my breaker bar. Then I put my knees up against the bottom of the frame and pulled like hell! The truck was up on 6-ton jack stands so the height helped a little, but a lift sure would have made things a lot easier. <---I was told thats what my eyeballs looked like afterwords!

 

[TheBac]

I'm surprised your testys didn't look like that too....:lol: a-mazing.

Well, you guys think the flywheel bolts are bad? Try messing with the harmonic balancer bolt. Holy Crap!

 

[MaxOD]

Did mine on the floor with a creeper to. Put my feet on the frame and held my arms straight and used my legs to push. I didn't find it too bad that way but is one hard pull.