Re: Engine rebuild, help!
Posted by HH56 On 2024/4/25 14:29:08
Packard went to a special rolled thread to help with this issue on engines made after 48. On a 48 you may or may not have had this stud but even if so equipped, sometimes during later repairs the special studs were not available so a damaged rolled thread stud was removed and block retapped for regular cut thread studs or in Don's case with his Henney, a regular bolt all of which have cut threads that were prone to leaking. It is also possible you have found an issue during the retorquing of rusted out or damaged block threads or a damaged stud just waiting to fail at an inopportune time.
If it held the new torque and it is a small weep and no danger of any coolant leaking into a cylinder it may reseal with time or you may be able to use one of the circulating sealants used in sealing up porous castings . Those go into the coolant and harden when they leak out and get exposed to air. If you don't want to try that -- and it may be a good idea to check the condition of the stud and threads anyway, then you will probably need to remove the leaking studs and put thread sealant on the threads going into the block.
Attach file:
studs.jpg (217.32 KB)
If it held the new torque and it is a small weep and no danger of any coolant leaking into a cylinder it may reseal with time or you may be able to use one of the circulating sealants used in sealing up porous castings . Those go into the coolant and harden when they leak out and get exposed to air. If you don't want to try that -- and it may be a good idea to check the condition of the stud and threads anyway, then you will probably need to remove the leaking studs and put thread sealant on the threads going into the block.
Attach file:
studs.jpg (217.32 KB)This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=270730