What was found
22.5 HOURS AFTER INSTALLATION OF OVERHAULED ENGINE, OIL PRESSURE LIGHT ILLUMINATED ON MASTER CAUTION PANEL AND OIL PRESSURE INDICATED 35 PSI. ENGINE WAS SHUT DOWN AND A PRECAUTIONARY LANDING WAS MADE AT NEAREST AIRPORT. DURING TROUBLESHOOTING, OIL LEAK WAS FOUND AT N2 TACH GENERATOR DRIVE. REPLACED SEAL, OPS CHECKED OK. OVERHAUL FACILITY ADVISED OPERATOR OF A SIMILAR RECENT OCCURRENCE ON LIKE ACFT/ENGINE INSTALLATION AND THEY SUSPECT SEALS NEED TO BE IMPROVED TO HANDLE THE INCREASED OIL CAPACITY OF IMPROVED PUMPS.