T3 & T4 Left Hand Threadform (January 15, 1998)

Garrett has replaced right hand threadform with left hand threadform turbine wheel assemblies for models T3 and T4. The left hand threadform is identified by a hex shaft nut (indicating left hand) rather than the 12-point shaft nut (indicating right hand) on turbocharger assemblies and CHRA’s.

Advantages of Left Hand Threadform

• Shaft nut loosening under load is virtually eliminated
• A true quality improvement – reflects latest generation wheel design technology
• Improved balance tolerance – thrust collar vapour blast eliminated
• Fewer turbine wheels to inventory due to part number standardization efforts
• No need for costly spiralock shaft nut

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