How should the oil filter disc stack be cleaned?

Backflush the filter disc stack in clean solvent to remove foreign particles, then air-blow between discs in a tangential direction back and forth along the stack. Do not use extreme pressure or attempt to disassemble the disc stack. Finish with a final rinse in clean solvent and air dry before reassembly.

When should the oil pumps be fully tightened and lockwired?

Not until the engine front cover is installed — the oil inlet and outlet tubes must be free to align with the front cover when it is positioned.

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Ford Racing Engine Manual p.24 - Oil Pump & Oil Filter Maintenance, Lubrication

Service manual page on oil pump installation with figures and exploded oil-filter assembly

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Service manual page covering oil pump installation and filter backflush procedures with figures.

AI caption October 2020 · Photo 261 of 274

This is page 24 of a maintenance manual, covering the Lubrication System — specifically oil pumps and the oil filter of an engine with pressure and scavenge (dry-sump style) oil pumps. It states factory flow-test specifications: the pressure pump produced a minimum of 3.8 gpm at 725-730 rpm with 45 psi outlet pressure, the oil pressure relief valve opened at 95-105 psi at 728 rpm, and both front and rear scavenge pumps produced a minimum of 2.5 gpm at 440-445 rpm with 45 psi outlet pressure, using SAE 20 oil at 180°F. Installation guidance explains aligning interconnecting shafts for free rotation, adjusting alignment via the cover-bolt tightening sequence, not fully tightening or lockwiring the pumps until the engine front cover is installed, and installing the front retaining nut before the assembly is seated. A special wrench (Figure 35) is used to torque the retaining nut. Oil filter service instructions cover careful handling of the filter disc stack, backflushing in clean solvent, tangential air-blowing between discs, a caution against extreme pressure or disassembling the disc stack, and final rinse/air-dry before reinstallation. Figure 36 shows an exploded view of the oil filter with labeled components (engine front cover, oil filter element, filter element nut, stud, pal nut, O-ring, filter housing, filter housing gasket, housing nut).

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Frequently asked questions

What flow did the pressure oil pump produce when flow-tested?: A minimum of 3.8 gpm at 725-730 rpm, with 45 psi outlet pressure.
At what pressure does the oil pressure relief valve open?: The oil pressure relief valve opened at 95-105 psi at 728 rpm.
What did the front and rear scavenge pumps produce in testing?: Both produced a minimum of 2.5 gpm at 440-445 rpm with 45 psi outlet pressure.
What oil was used in the pump flow tests?: SAE 20 oil at 180°F.
How should the oil filter disc stack be cleaned?: Backflush the filter disc stack in clean solvent to remove foreign particles, then air-blow between discs in a tangential direction back and forth along the stack. Do not use extreme pressure or attempt to disassemble the disc stack. Finish with a final rinse in clean solvent and air dry before reassembly.
When should the oil pumps be fully tightened and lockwired?: Not until the engine front cover is installed — the oil inlet and outlet tubes must be free to align with the front cover when it is positioned.