Re: GAV replacement
The first thing you want to do is determine if the GAV seat is cast or a screw in brass seat. Do that by shining a flashlight down into the tunnel and look for a screwdriver slot. if the seat is brass and it does not unscrew easily do not force it as it is very easy to damage the screwdriver slot and make it more difficult to remove. In this case use a torch to heat the casting in the outside area of the brass seat. Get the casting hot enough to observe a slight red glow. Then immediately dunk the entire casting into a bucket of cold water. This usually shocks it loose and it is then easy to unscrew it.
It is prudent to use this technique on any brass part on a Zenith that is frozen in place.
Also be careful not to confuse the brass GAV seat with the comp jet, they look almost identical, but they are not.
Tom Endy
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