Detroit Diesel has found a fixed number turbochargers with compressor wheel failures. As a result, current Series 60 engines with Garrett GT40 and GT42 turbochargers will be replaced by a newly designed GTA40 and GTA42 turbochargers. This change went into effect in April 2000.
Details & Reason
Detroit Diesel now installs the new GTA40 and GTA42 turbochargers on Series 60 applications. After exhaustion of old stock, the new part number may be used to service the old part number in all groups where the original part number was used. See Figure 1 for old and new turbocharger part numbers.
The difference between a GT and a GTA turbocharger, is that, a GTA turbocharger has a new CHRA (center housing rotating assembly) with a boreless compressor wheel. The servicing of these two turbochargers remains identical.