Variable Geometry Mechanism Checks - 6.7L

VARIABLE GEOMETRY MECHANISM CHECKS - 6.7L




1. Inspect turbocharger sector gear and bearing housing surface for damage. Replace turbocharger if damaged.

NOTE: Do not use tools of any kind to force sector gear to move.

2. Rotate sector gear clockwise and counter-clockwise. Movement should be smooth, without binding and require only moderate force. If sector gear binds or does not move, replace turbocharger.

NOTE: Use stepped alignment pin from turbocharger actuator service kit. If service kit is not available, use pin or drill bit of specified size.

3. Rotate turbocharger sector gear clockwise. Insert large end of alignment pin (0.187 in. drill) through sector gear until it engages hole in turbocharger bearing housing and sector gear will not rotate. If alignment pin does not engage hole in turbocharger bearing housing, variable geometry mechanism is not closing completely. Turbocharger must be replaced.
4. Remove alignment pin from sector gear and rotate sector gear clockwise and insert small end of alignment tool or 3.175 mm (1/8 in.) drill, through sector gear until it engages the alignment hole in turbocharger bearing housing and sector gear will not rotate. If alignment pin does not engage hole in turbocharger bearing housing, variable geometry mechanism is not opening completely. Turbocharger must be replaced.

NOTE: If turbocharger has passed sector gear movement checks, turbocharger is functional. Turbocharger actuator must be replaced. Leave alignment pin in place.