I am replacing all the rod bearings( in frame ) on my truck. THis is the first time it comes apart. Can i reuse the rod bolts. Do i need to add an extra 10 degrees after the new 85 degree spec.

 

Anything that is measured in degrees is torque to yield, torque to yield bolts are not reusable.

So get new bolts and torque to spec.

 

Yes you can re use the connecting rod bolts on that model and the revised spec is 85 degrees after the initial torque on the first pass.

Connecting Rod Bolts - First Pass
20 N·m
15 lb ft

Connecting Rod Bolts - Final Pass
85 degrees

 

Re using tty bolts is a horrible idea, ESPECIALLY on rod bolts, they are never the same after first use. All it takes is one to stretch out at high RPM and let go of a bearing and the motor (including the block usually) is done.

Why in the world would anyone risk their engine over a set of bolts.




I wanna see where it says they are reusable.

 

Common misconception. There is torque to yield , and there is torque to angle. Both are measured in degrees.

Do you change your main cap bolts too?

 

I've never been able to find solid enough information on it when I looked for it so I always went by the better safe than sorry method. And the bolts are fairly cheap and highly critical so I figured it'd be foolish not to replace them.

I've seen people say the bolts are reusable but I haven't found an article from manufacturers (auto or bolts) that confirm it. So I was worried it could be hearsay.

I could be wrong, I have been before. But personally I don't see the point in risking it considering the price of some bolts vs the price of an engine.

 

In the factory manual, It only states the head bolts and the balancer bolt are torque to Yield Applications and the bolts must be replaced.

If the bolts were TTY, the factory manual would state that the rod bolts and main caps would also need to be replaced at time of service. Like in the Duramax engine. It state's to replace the rod bolts.

 

Thanks for the info. I tried to find that and couldn't find good info on it, looked it up in alldata as well and it didn't have that info either.

My apologies for the misinformation. I would personally still replace them though, they're cheap, and we know what happens when a rod bolt stretches under high rpm.

 

MULTIPLE turbo builds. Most near 4 digit territory. I've never replaced a stock rod bolt.

 

I believe you but we both know rod bolts aren't about power level, rod bolts come into play with RPM. If they aren't TTY bolts then I'm sure they can be reused, however I feel the RPM threshold would be a hair higher on fresh bolts than bolts that have been stretched a couple times.

Tensile strength is what would be my concern. I'm genuinely asking, do you guys think a fresh bolt would have a higher tensile strength than a bolt that's been stretched once or twice before?