AAZ torque specs for Mains and Rods

[Gizmoman]

I'm installing new main and rod bearings in the AAZ finally and the Bentley specs seem low to me.
Bentley says fully threaded main bolts (new) go to 48 ft/lbs + 1/4 turn. The rod bolts (new as well) go to 22 ft/lbs + 1/4 turn.
I am using a clicker and a quality dial wrench just to be sure. I don't do this every day but it just feels light.

Any thoughts? I'd really hate to loose one later

[Toby]

That is pretty typical for for a 4 banger of that size. The 1/4 of a turn means they are some kind of stretch bolts. The issue is whether they have been tightened past the point of plastic deformation. If the bolts have been torqued past their elastic limit, they should be replaced. One 1/4 of a turn may not do that, however. I know a number of people do not replace the bolts, but I probably would, IF it were a motor that was going to be abused, and if they are readily available. If they are not, it usually means that almost nobody is actally changing them.

TTY (Torque To Yield) head bolts, for instance, are tightened 3/4 to a full turn after the initial tightening and definitely get past the elastic limit and should not be reused. It is weird when they do this. You can feel them lose resistance when it happens, like that sinking feeling when you strip a bolt.

[Gizmoman]

Thanks Toby.
All the bolts are brand new and I believe they are also all tty.

Like I said, I'm just not used to torquing bolts everyday and it just "feels" light.

[libbydiesel]

If memory serves, those are the correct specs.  That's what I have used. 

[Gizmoman]

Thanks libbydiesel. I'm just a bit unsure of my efforts sometimes and I read too many posts. Most of them are of failures of some sort which stands to reason I suppose.

[dave friday]

When i undid the big end bolts on my 1,6td [done up to 22ftlb+1/4 ] after 50,000miles they were very hard to undo,had to put a lot of push on the bar!!.