N14 Base Engine Troubleshooting and Repair Manual – 010-049   Turbocharger Turbine Seal Leaks

Add one unit of fluorescent tracer, Part No. 3376891, to each 38 liters [10.0 U.S. gallons] 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 No. 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

010-033-002.

Use a high intensity black light, Part No. 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

010-033-026.

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

Operate the engine and check for air leaks.