B5.9G, B5.9LPG – Troubleshooting and Repair Manual – 010-049   Turbocharger Turbine Seal Leaks

Fluorescent Tracer, Part No. 3376891

Add 1 unit of fluorescent tracer, Part No. 3376891, to engine lubricating oil.

Operate the engine at low idle for 10 minutes.

Shut off the engine.

Allow the turbocharger to cool.

Remove the exhaust pipe from the turbine housing.

Black Light (DC), Part No. 3824754

Use a high-intensity black light, Part No. 3377253 or 3377394, to inspect the turbine outlet for leaks.

A dark blue glow indicates a fuel leak. Refer to Procedure 007-044. A yellow glow indicates an oil leak.

If oil is found on the turbine housing, remove the oil drain line, and check for restrictions. Clear any restrictions found, or replace damaged components as required.

If the engine is equipped with a turbocharger oil drain fitting with a screen, remove the fitting, and check to make sure the screen is clean.

If the oil drain line is not restricted, remove the turbocharger. Refer to Procedure 010-033.

Black Light, Part No. 3829754 or 3824524

Use a high-intensity black light, Part No. 3829754 or 3824524, to inspect the turbine inlet for leaks.

A yellow glow indicates an oil leak from the engine.

If a yellow glow is not seen in the turbine inlet, replace the turbocharger. Refer to Procedure 010-033.

Install the exhaust pipe to the turbocharger and tighten the clamp.

Operate the engine, and check for air leaks.