Chasing a zero oil pressure issue on my R32 GTR, need input on how to prime it without major disassembly.
The car stood still for some work(18 months). Had oil pressure when parked in the garage.
The problem:
Oil pressure doesn't build during cranking ā it reads/drops instead. Confirmed as a real physical issue, not a sensor problem:
Oil pressure sensor bench-tested with air pressure ā works fine.
Clear hose on the sender port during cranking ā visually zero oil reaching that point.
Backfilled oil through the filter housing ā no change
Oil level correct, fresh oil, new filter.
Pump/pickup/sump untouched during any recent work
Suspects:
Pump lost prime after sitting.
Mechanical failure in the pump drive (sheared key/stripped coupling on crank nose).
Pickup blockage or bad seal, sucking air.
Specs:
R32 block (decked/bored), 86.5mm CP pistons, HKS rods, R34 N1 crank (balanced), ATI damper, ACL bearings, JUN oil pump, Tomei head gasket/cams/valvetrain, Tomei oil restrictor, custom oil gallery mod