Subject: Pietenpol-List: Source for A-75 .020" under bearings?Hi Folks,Anybody know where I can buy .020" under bearings for the A-75? I tore it downthe other day due to: 1. low oil pressure (27 psi @ 145F on a 90F day with SAE 50wt) 2. no logs on the engine, hence an unknown # of hours on it3. a low frequency vibration at reduced throttle settings (about 2000 rpm downto about 1600). I found the center and rear mains worn down to the copper around 90% of their diameter,and the rod bearings showing copper under the beam of the rod. Cam andtappets look great
.The engine had new oil pump gears and a fresh top-end w/ chrome cylinders 65 hrago when it was installed in the Piet by the builder, but I was always concernedabout the bottom end due to the lack of documentation. The vibration convincedme it was time to open & inspect.The crank passed magnaflux, but was previously ground .010" under and is now worn/scoredslighly/just out of spec for fresh .010" bearings. I haven't startedlooking for .020" under bearings as I didn't think they existed, but read ofthem tonight on Harry Fenton's website. I appreciate any "tribal knowledge" on this, as I've been into many engines ofmany types in the past but this is my first Continental. I do have the factorymanual for reference, and I have to say this is one of the simplest little engines(in a good way!) that I've ever seen. What do y'all recommend for sealing the case halves? I've always used Hylomarfor Porsche/VW engines, but this Continental appeared to have been sealed previouslywith blue Aviation Permatex.Thanks in advance!Dave MordecaiPanacea, FL, where it's too hot to fly this time of year anyway, so I may as welloverhaul my engine!Hi Folks,Anybody know where I can buy .020" under bearings for the A-75? I toreit down the other day due to: 1. low oil pressure (27 psi @ 145F on a 90F day with SAE 50wt) 2. no logs on the engine, hence an unknown # of hours on it3. a low frequency vibration at reduced throttle settings (about 2000 rpmdown to about 1600). I found the center and rear mains worn down to the copper around 90% of theirdiameter, and the rod bearings showing copper under the beam of the rod. Camand tappets look great .The engine had new oil pump gears and a fresh top-end w/ chrome cylinders 65hr ago when it was installed in the Piet by the builder, but I was alwaysconcerned about the bottom end due to the lack of documentation. The vibrationconvinced me it was time to open & inspect.The crank passed magnaflux, but was previously ground .010" under and isnow worn/scored slighly/just out of spec for fresh .010" bearings. I haven'tstarted looking for .020" under bearings as I didn't think they existed,but read of them tonight on Harry Fenton's website. I appreciate any "tribal knowledge" on this, as I've been into manyengines of many types in the past but this is my first Continental. I do havethe factory manual for reference, and I have to say this is one of the simplestlittle engines (in a good way!) that I've ever seen. What do y'all recommend for sealing the case halves? I've always usedHylomar for Porsche/VW engines, but this Continental appeared to have been sealedpreviously with blue Aviation Permatex.Thanks in advance!Dave MordecaiPanacea, FL, where it's too hot to fly this time of year anyway, so I may aswell overhaul my engine!________________________________________________________________________________