Replacing Rod Bolt

[anarchyjet]

Doing a stock rebuild with LW rods and cast pistons. Rods were resized at the machine shop and new pistons pressed on. Went to assemble the short block and one rod bolt just didn't feel right on that last 1/4 turn. Was going to loosen up both nuts and re-torque but it was seized on the bolt and broke. I have another rod but what is the best option. Take piston and replacement rod to machine shop? I've heard cast pistons can break when pressing the pins out. Can I take a bolt out of the other rod and press it in place of the broken one, without unmounting the piston. Does the rod need to be resized again, even if it is another stock bolt going in. Say eff it and run on 3 cylinders???

Need some advice.

[cordes]

Did you install new rod bolts when they were resized last? If you had the machine shop install new ones I would take it back there and hope they would fix it. Regardless, I would have a machine shop at least check the rod for size if you install new bolts.

[Gaboon]

Why would the rod size change when replacing rod bolts?

I've replaced rod bolts with new ones when I used to have to replace stock pistons on a bi-weekly basis way back when. Bang the old ones out and bang the new ones in and done.

[83scamp]

Why would the rod size change when replacing rod bolts?

I've replaced rod bolts with new ones when I used to have to replace stock pistons on a bi-weekly basis way back when. Bang the old ones out and bang the new ones in and done.

Replacing a bolt can change the roundness of the bearing bore slightly. Is it enough to worry about? Well, doing a stock type rebuild, maybe not. If your building a close tolerance racing engine, it could mean the difference between spinning a bearing and not. Any time you apply force to parts like that, you can move them.

[anarchyjet]

Did you install new rod bolts when they were resized last? If you had the machine shop install new ones I would take it back there and hope they would fix it. Regardless, I would have a machine shop at least check the rod for size if you install new bolts.

No the bolts were not replaced they just ground the caps and resized the big end

[cordes]

I would take it to the machine shop for a check before installation.

[Ondonti]

I try to torque to the bottom of the tolerance if there is a range for rod bolts.