Does anyone know if there is a special tool made to remove the treaded plug from the passenger side head on a 305? My car is an 86 with TPI, an F code engine. The OEM fan switch is located on the front of the intake manifold just above the water pump. I want to install an aftermarket fan switch in the passenger side head.

The plug has a square hole in the top. It is smaller then a 3/8 drive, but larger then a 1/4 drive, somewhere around a 5/16, but could be metric. I tried grinding down a 3/8 drive on a 1/2 to 3/8 adaptor, but it twisted off of the socket with pressure applied. There should be some sort of socket made with a case hardened 5/16 bit that will fit this plug. I ahve not been able to find one.

Thanks in advance,
Charles

 

yes there is a special tool for those plugs. Finding one is possible but it would be through someone like Mac, Matco, or Snap-on. I borrowed a socket from a guy I knew and it was too tight. I just rounded out the sqaure in the plug.

 

I tried to remove mines on a rebuild...but I broke my friends tool....darn.
It was a 5/16 allen wrench socket...a pretty tough tool at the best of times.
I believe it's sealed in pretty good and heat will be required to remove it.
I just gave up on it. If I need to remove my heads for any reason I will strive to get it out.
meanwhile I found a reducer to fit my egr thingy place on my water outlet and inserted the sensor in there. It is to control the engine fan if I recall.

 

You can order the socket from Snap On. It's the next size smaller than the 3/8" square drive. I gave up trying to remove mine while the engine was in the car for fear of stripping it out. When I pulled the motor last Summer I was easily able to remove it with the drive while the motor was on a stand.

 

this might sound kinda funny but if you have a pipe plug thats to tight to remove try to tighten it first it will move and then remove it if its a oring type plug rap it with a hammer first and then remove it