Guess I kinda prompted this discussion on TEFLON TAPE
SCENARIO: 1980 Ford Mtr. Lima OH Engine PLt. 460 CID Block line final washer. A 3/4" hydraulic line broke, when replaceing it on the afternoon shift, TEFLON TAPE was used on the fittings. Next day, some of that tape got into the hydraulic valves, that shut down the operation. Now just try and troubleshoot a situation like that. Long story short. took 10 hours to clean out the whole hydraulic system. Estimated cost, loss of production, $225,000. Evidently tape was used when the unit was first built, when screwing the fittings in on the repair, it evidently pushed some shreds into the system that was left in the female threads. As Gen. Foreman of maintance, that's when I outlawed the use of TEFLON TAPE use on any hydraulic system.