Posted by Indiana Ken on January 17, 2013 at 05:59:47 from (66.249.232.131):
In Reply to: Leaking Head Studs posted by David G on January 16, 2013 at 19:50:44:
One thing I observed on threaded pipe fittings for plumbing work. One time I did have any tape and elected to use a PTFE sealant. Several of the fittings leaked water when the system was placed in service - additional tighening did not help. I disassembled the leaking fittings and noted an absence of sealant inside the fitting. It was as if the female fitting wiped the sealant off the male threads as they were threaded together.
I reassembled the fitting placing sealant on the inside of the female fitting in addition to the male threads. No more leaks. I believe this method allows sealant to be pushed into the thread spaces when the system is pressurized thereby effecting a seal.
For tractor work I tend to use sealants rather than tape. I believe the various sealants will work however they have to be carried into the thread spaces to effect a seal. Of course one always needs to use sealants or tape sparingly to prevent contamination.
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