17.)              The tachometer proximity sensor sender is mounted on the case centerline via. Custom machined .125” 2024-T351 aluminum flanges.  It reads a 60-tooth electro less nickel-plated chrome moly timing wheel mounted between the prop flange and the 5-inch prop extension.

18.)         Crankcase ventilation:         The crankcase ventilation fitting passes through the accessory case cover.  On the inner surface of the cover, a heli arc-welded aluminum baffle shields the vent orifice.  The baffle is oriented to shield the orifice from oil splash from the direction of rotation of the timing gears.  This greatly reduces the volume of oil mist carried out of the crankcase with crankcase gases. 

Based on reports of needle bearings getting loose inside engine without a starter, the needle bearings that support the conventional starter gear inside the accessory case have been removed at assembly of case.

19.)         Oil separator and Motor Mount:      The oil separator has been opened and 2 “Brillo” pads have been inserted to increase oil condensation.  The oil separator is thermally insulated from the firewall with ceramic paper to reduce any potential for heat-soak into firewall structure and into glass of reserve (header) fuel tank.               

The bolting of the motor mount to the mounting extrusions is reinforced by chromoly slugs turned and drilled to fit on the inside of the 4 open forward stubs of the motor mount.  These allow the 8  AN-4 bolts attaching the engine mount to the airplane to be torqued to full torque without ovalizing or distorting the stubs of the motor mount.  Before the motor mount was mounted to the airplane, it was magnafluxed by Aeroprop at Jefferson county airport – Denver and it has been completely sloshed with linseed oil.

above:

a.                    joining of mount to extrusions uses internal chromoly slug for full torqueing of bolts

b.                    oil separator.  Chromoly insures no bimetallic galvanic corrosion potential.

c.                    oil separator thermal insulation

d.                    oil return line

e.                    sealed tach drive preventing oil pressure failure through tach drive seal.

f.                     another view of oil filter adaptor

20.)         Belly compartment:            Forward of the firewall is a compartment accessible through a cover between gear legs.  It contains many components away from the heat and exposure of the engine compartment.   Shown below are the fuel filter,  pressure switch for the Hobbs /  oil pressure warning light, and the Piper fuel valve that replaced the original brass fuel valve.