Hi folks I recently connected my manifold pressure gauge up using 1/8" Nyloseal tube (22NSR) to a 1/8" NPT thread adaptor.
The adaptor is a brass Poly-Flo fitting (Aircraft Spruce P/N 268P-02x02). This fitting is used on 1/8" tube since Nyloseal equilivents are not available for tube less than 1/4". These adaptors used to comprise a collar or olive that is compressed and bites into the tube as the clamp nut is tightened. They can therefore be removed simply by undoing the nut and if necessary cutting off the old olive and replacing it with a new one. They are good for both vacuum and pressure. However, the new generation fittings I received from AS (stamped "Alkon 1/8") require the tube to be merely pushed in whence it becomes locked by "one-way teeth" and I presume air pressure against some sort of seal. There is no clamping nut or olive. Unfortunately these fittings leak past the "teeth"/ seal when under vacuum in my manifold system leading to high idle MP (19"). My problem is that I cannot get them apart to get the tube out prior to replacing them. I could cut the tube and dispose of the fittings but then I will need to reroute new tube (as the old will be too short) which is a hassle given I've only just resealed my firewall and completed cable tying the existing one. So: 1) What is the secret in removing the tube from these new fangled fittings? 2) Do not use them in vacuum situations? Why do they have to change things....the old olives worked just fine. Ho Hum must be getting old. 50 years coming up soon. Also does anyone know what the difference is between 1/8 BSP (Churchill) and 1/8 NPT (Eisenhower)? Must be bugger all at this dimension!! John The Martindale Family 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA phone: 61 2 66584767 email: johnj...@chc.net.au
