Detroit Diesel GT42 & GTA42 Models (March 09, 2001)

GT42 models supplied to Detroit Diesel use a THREADED BORE compressor wheel and the design has now been upgraded to a BORELESS compressor wheel. This design of wheel offers an improved resistance to low cycle fatigue.

The new design of turbos is called the GTA42 range. The GTA range differs from GT range by the use of 8mm bolts to retain the backplate onto the center housing. The GTA42 also use a dynamic seal with the boreless wheels, where earlier designs used a carbon seal. The dynamic seal improves the overall efficiency of the turbos whilst maintaining effective oil sealing at the compressor end.

Trevor Cass
Product Support Engineer
Allied Signal Automotive