Hi I changed the water pump along with the houseing ,key, o rings complete kit also changed the thermostats and popet valves. I have been working on this engine for a few weeks and pump was working fine plenty of water comeing out of telltale untill now.. I hooked up muffs to engine turned water on and started engine normally water run`s out almost immediately., this morning nothing shut it down and checked hose and muff`s started it again and still nothing., temp guage started riseing so shut her down still no water I have run this engine on the muff`s since I did the pump probally has about an one hour or so of running time temp. was good not sure what happened anybody have any ideas?? glad it did not happen on the water Thanks Bill