Those are not oil filters. The center component is a magneto and the two components flanking it are distributors. The engine is equipped with a low-tension ignition system. Low voltage to each cyclinder where a coil rests in the head baffle. Follow the "Y" leads up to the cylinders. From the coils, high voltage to each spark plug. The R/H distributor (as viewed from the rear) fires the front plugs of the front and rear cyls, whereas the left distributor fires the rear plugs on the front and rear row. The silver tube on the bottom of the intermediate nose case is the scavenge oil line. In cold weather the nose case scavenge pump drive gear can shear, thus oil not returned from the front of the engine. The flight crew will notice oil qty dropping and punch out the engine. Although the nose scavenge pump is easy to pull to verify the problem, the gear that actually shears is the drive gear in the intermediate case, thus off comes the prop, nose case and intermediate case ( a job that sucks at 40F below).
Salute all
IFF52nd
