Land Rover Range Rover 2010–2013 — technical service bulletin
Bulletin LTB00482NAS3 · NHTSA communication 10100974 · issued Jan 8, 2014
Technical service bulletin
communication type
Engine
component
2010–2013
model years
7
vehicle entries
Official summary
"situation: a clattering noise may be heard from the engine. Upon further investigation, including removing the supercharger drive belt and running the engine to confirm the noise is no longer present, the noise may be found to be coming from the supercharger assembly. Cause: this may be caused by the following conditions: the torsional isolator spring may fail due to lack of adequate input shaft pilot support, leading to overhang and increased stresses in the torsion spring and causing excessive backlash in the supercharger drive and no torsional damping. Bearing contamination."
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.