Stripped threads on a piston rod

1crosscut

1crosscut

Well-known member
I'm in the process of tearing down a B engine. Have not gotten as far as seeing what the three mains look like yet but have removed all of the pistons.
Babbitt on all of the rods look very nice with shim packs .032 - .035 on both sides of all the rod caps. Unfortunately one of the rods threads are weak and won't hold torque.

Just wondering what others have done in situations like this.
 
Realize that. Just curious if folks generally go with 4 new rods or try to weight match a new one to the other three.
 
What type of nut are you using?
If a stock style hex with cotter pin slots, it may be the culprit.

I don't use them anymore for a variety of reasons, instead use an aftermarket nut such as
mcmaster #90759A650

Use 55#ft torque

J
 
johnneilson said:
What type of nut are you using?
If a stock style hex with cotter pin slots, it may be the culprit.

I don't use them anymore for a variety of reasons, instead use an aftermarket nut such as
mcmaster #90759A650

Use 55#ft torque

J
Click to expand...

It wasn't from over torqueing the nut as it came off buggered up.
I torque rod nuts to #35 lbs.
 
It happened to me once on a friends car. The babbit was still good so we threaded it to
11mm and used 11mm nuts.
 
On page #1-134 and on page 1-143 it says 35 ft lbs, on "Specifications" page 1 it says 40-50 ft lbs.
 
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