How To Check A Turbocharger. Check that the exhaust system including catalyst and DPF is not blocked or damaged. Turbocharger System Diagnostics Guide.
Checking turbo on semi truck. Check for vacuum at the hose going to the waste-gate actuator on the turbo you want to see at least 20 inches of vac if less trace back to find problem. This test is easy and only requires simple hand tools.
If the turbocharger you are examining has had a bearing or seal fail be sure to confirm the integrity of the oil feed and drain lines.
Using the pressure pump slowly apply pressure to the wastegate while feeling the bypass line. Check that the pipework and support brackets are not loose or damaged and that the connections are good. If however there is a manufacture fault in the part supplied then the unit will fall under manufacture warranty. Check play both directions.
