Oil Pump: Inspection
WARNING: This page is about a different car, the 1983 Volkswagen Vanagon, 1983 Volkswagen Rabbit, 1983 Volkswagen Quantum, 1983 Volkswagen Pickup, and 1983 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Check oil pump gear backlash with feeler gauge. Clearance should be between .002-.008" (.05-.20 mm). Measure the pump gear end play using a machinist's square and feeler gauge for .006" (.15 mm) clearance or less. If specifications are exceeded, replace the gears or the pump.