Quote:
Originally Posted by t walgamuth
I rebuilt one turbo over the years to get rid of a whistle. It still whistled when done. They really last a long time. I'd never rebuild one unless it had an obvious problem and did not work at all.
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On Diesel Truck Engines whistling often comes from a leak in the Intake Manifold to Cylinder Head Gasket or where the Turbo Connects to the Intake.
Unfortunately I can't remember the proportions (likely can be looked up on the internet) but you can make a mix of Dawn Dish Soap mixed with Water to make mix that you can blow bubbles with and you spray that on a
cold Engine around the Intake Manifold connections and also around the Exhaust Manifold to Cylinder head gasket area. Start the Engine and rev the Engine so that Turbo will Boost and if here is a leak you will see bubbles. My Boss where I work showed me this.
The waste gate hose could also be a leak area and the ADLA connectors and hoses.