Turbocharger TB25 717123-0001 A6620903080 Ssang Yong OM662

Inspecting the Turbine Wheel & Shaft Assembly

This is the most vital and costly component in the entire turbocharger. It’s critical that this part be well evaluated for a successful rebuild. Use the 1-inch micrometer and measure both portions of the turbine shaft where the bearings have been riding. Measure and write down the compressor and turbine end shaft diameters to the fourth decimal. Be sure to rotate the shaft slightly to ensure that it measures round.

Next mount the turbine shaft into a V-block as shown. Place the dial indicator on the end of the stub shaft just before the threads. While holding down tightly on the V-block, slowly rotate the wheel and watch for dial indicator reading variance. Ideally you will not see any measurable run out.