Cummins N14 STC, Celect, Celect Plus – Service Manual 010-049   Turbocharger Turbine Seal Leaks

Add one unit of fluorescent tracer, Part Number 3376891, to each 38 liters [10.0 gal] of engine lubricating oil.

Operate the engine at low idle for 10 minutes.

Shut off the engine.

Allow the turbocharger to cool and remove the exhaust pipe from the turbine.

Use a high intensity black light, Part Numbers 3377253 or 3377394, to inspect the turbine outlet for oil.

NOTE: A dark blue glow indicates fuel and a yellow glow indicates oil.

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

If no drain tube restriction is found, check for restrictions in the engine breather or the breather tube. Clear any restrictions found or replace damaged components as required.

If no turbocharger drain or engine breather tube restriction is found, remove the turbocharger.

Refer to Procedure 010-033 in Section 10.

Use a high intensity black light, Part Numbers 3377253 or 3377394, to inspect the turbine inlet for leaks.

NOTE: A yellow glow indicates an oil leak from the engine.

If a yellow glow is

not
seen in the turbine inlet, replace the turbocharger.

Install the turbocharger.

Refer to Procedure 010-033 in Section 10.

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

Operate the engine and check for air leaks.