What could occur if thread sealant was not installed on the threads of a head bolt being installed in a wet hole in the cylinder block?

Question

Quizplus · Accepted Answer

When installing a head bolt in a wet hole (one that is exposed to coolant), failing to use thread sealant can allow coolant to leak around the threads of the bolt. This is because the sealant helps to prevent fluid from seeping past the threads, which is especially important in areas where the bolt passes through a coolant passage.

What Could Occur If Thread Sealant Was Not Installed on the Threads