david4451
Well-Known Member
- Joined
- February 9, 2015
- Messages
- 309
- Reaction score
- 47
- City, State
- cotabato philippines
- Year, Model & Trim Level
- 2001 ford sport trac
I've got the cylinder heads off my ST, put new valve seals and reground all the valves. All this being linked to fitting new timing parts.
I looked on YouTube for checking the integrity of the valve sealing, I wasn't impressed by the methods used. It basically involved putting liquid into combustion chamber and watching to see if it leaked away.
So I came up with a method of testing the valve sealing using compressed air. I bolted a large rubber gasket followed by a 1/4 inch aluminium plate with spacer to put pressure at the right area of combustion chamber. My threaded rod went through the cylinder head bolt holes to an aluminium bar with holes drilled at 150 mm.
I used an old spark plug, ceramic etc removed and epoxyed a tube to supply compressed air.
After a little adjustment to bolt tightness it worked extremely well and all valves held at original pressure of +80 psi.
I looked on YouTube for checking the integrity of the valve sealing, I wasn't impressed by the methods used. It basically involved putting liquid into combustion chamber and watching to see if it leaked away.
So I came up with a method of testing the valve sealing using compressed air. I bolted a large rubber gasket followed by a 1/4 inch aluminium plate with spacer to put pressure at the right area of combustion chamber. My threaded rod went through the cylinder head bolt holes to an aluminium bar with holes drilled at 150 mm.
I used an old spark plug, ceramic etc removed and epoxyed a tube to supply compressed air.
After a little adjustment to bolt tightness it worked extremely well and all valves held at original pressure of +80 psi.
