VF48

Shaft radial and axial play inspection (target: radial <0.5-1.0mm, axial <0.025-0.085mm) - spin shaft to assess side-to-side and in-and-out movement for bearing wear

Compressor and turbine wheel blade condition inspection - check for chips, bending, rubbing marks, or scraping damage using flashlight illumination

Oil supply line inspection - verify absence of kinks, restrictions, leaks, and proper flow to turbo bearings (critical at 150,000+ RPM and 450F operating temps)

Oil drain line clearance verification - confirm no clogs or flow restrictions that cause carbon deposits and bearing starvation failures

Wastegate diaphragm and valve function test - check for seizure, incorrect pressure settings, or failed actuation affecting boost control

Compressor and turbine housing seals examination - inspect for oil contamination, soot buildup, broken seals, or leakage signs

Maximum turbine speed and operating temperature validation - confirm operating within rated limits (typical max 150,000-180,000 rpm, max gas temp 950C)

Coolant flow verification and maintenance (for oil-cooled variants) - ensure adequate circulation at recommended temperature (typically 70C) and flow rates