|
To the right inbetween two head retaining nuts, is a coolant pressure release valve, made from a tire stem. External threads were cut on the stem so that it could be screwed into a matching threaded hole in the head. JB Weld seals the thread and keeps the assembly in place. On the left side is a head vapor release port through an elbow made from a AN elbow. With the head higher than the radiator, this port is necessary to prevent steam from building up in the head. The port is connected to another bleed line from the top of the radiator and "Tee'ed" off to the coolant pop off and recovery system. Just below that on the front of the head is a small temperture sensor.
The casting was very thin and so I had to add thickness by using some 1/8 inch thick aluminum angle. The angle is was attached with three button head cap screws. Before putting the angle into place, JB Weld was used between the head surfaces and the angle and on the screw threads to prevent leaks and to fill all voids. Then the head was drilled and tapped to receive the elbow and temperature sensor. JB Weld was used on the elbow threads in the head and silicone adhesive as used to seal the threads on the sensor.
|
By placing the temperature pickup lower on the circumference of the head, one ensures that the sensor is in water. Just above it is the vapor relief vent.
{3/3/15 - Engine vibration was too severe. I ruined two sensors before I gave up and moved the sensor to a different location.} The lower view shows the bottom of the tire valve protruding. Since the radiator is lower than the head, one cannot take the radiator cap off without coolant leaking out of the full system. By removing the valve cap and depressing the valve, one can release pressure from the system. I had some difficulty in removing the head. There was a very tight fit between the studs and the pass through holes in the head. Since "O" ring seals were used between the head and the cylinder and there is a boss on the head that fits into the cylinder bore, I redrilled the head through holes with the next size fractional drill to give the studs a little more clearance. |