"basskisser" wrote in message


Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

I am not sure how you would make that tool. It wouldn't be hard to drill a
clearance hole in the outer bracket of the radiator cap. The pipe, as you
describe, would probably fit down the center of the pressure relief spring
okay. What I don't see is how you fasten the pipe to the seal surface
without destroying the sealing surface and/or gasket and make sure that it
doesn't become a source of leaks.

Since he would need to be jury-rigging the closed loop system he could just
simply not use a radiator cap. Simply close the system with a pair of hose
barbs fitted into regular old pipe. With a Tee and some reducer bushings
you could arrange for a tire valve and pressure guage with ease.

Just be real careful with the pressure if you don't have the pressure relief
of the radiator cap. I would recommend a hand pump instead of an air
compressor.

Rod