Rebuild update

[Alex Blair (RIP)]

Originally posted by Jordan Baker
Hi Brad

Your carrier bits are coming together very nicely. You will ahve a really good looking Carrier shortly.

May I suggest one thing. Grind the platting/grade marks off the heads of those bolts. A few seconds with a bench grinder and they will look much more period.

Jordan

I hate to be a party pooper but take those silver coloured bolts out and throw them away...
The number of notches on the head indicate the hardness of the bolts..
The silver ones are "three knock" bolts..very soft and they stretch...
The gold ones are good..."6 knock" bolts...
The more notches the harder and more tensil strength...

What will happen....
Use the three knock..torque them down to 50 FT/lbs..
Drive the vehicle around for a few days and recheck the breakaway torque...It will have changed...
They will have appeared to have loosened,which they will..
They will stretch..Pull out a loose one and mic it against a new one..It will be longer and thinner...
Save your self some grief ..Leave them in and the whole carrier ,where they are used will stretch,loosen up and squeek and groan and the will eventually break...


Found this out from changing head bolts in refrigeration compressors years ago..
Couldn't get them to stop leaking ..would retorque..and every thing would be fine for a few weeks..Come back..heads were leaking again..
Finally dawned on me the damned bolts had been changed on a factory rebuild and the wrong tensile strength bolts were installed..
Changed the bolts for harder bolts..problem solved..
And I didn't need a micrometer to see how much they had stretched ..it was quite profound..