How to Replace a 7.3L GTP38 Turbo Center Cartridge Photo Gallery
Bruce W. Smith –
Aug 14, 2017
Photo 1/15 | Garrett Turbo Cartridge Replacement Horiz Lead
Photo 2/15 | 003 Garrett Turbo Center Cartridge | RiffRaff Diesel Performance’s Garrett GTP38 center cartridge comes as a complete assembly, balanced and ready for installation. RiffRaff offers an optional billet compressor wheel for $180 that quickens spool-up, stops surge, and increases power.
Photo 3/15 | 004 Garrett Turbo Cartridge Remove Rod | A small pick works well to pop loose the E-clip that secures the wastegate actuating rod to the lever on the EBPV housing. No need to remove the wastegate or the EBPV housing.
Photo 4/15 | 005 Garrett Turbo Cartridge Hammer Compressor Housing | The compressor housing will probably need to be given a few gentle taps with a soft hammer to pop it free after the five 8mm 12-point bolts are removed.
Photo 5/15 | 006 Garrett Turbo Cartridge Comparison | The new Garrett GTP38 center cartridge (left) is a factory replacement from Garrett with new seals, bearings, and rotating parts—all balanced for simple drop-in replacement.
Photo 6/15 | 007 Garrett Turbo Cartridge Bolt Removal | We remove the 8mm 12-point bolts that hold the centersection to the turbine housing. To make the job easier, it’s highly recommend to squirt all the bolts with a good penetrating lubricant, such as PB Blaster, and let them soak for an hour before disassembling.
Photo 7/15 | 008 Garrett Turbo Cartridge Center Removal | A light tap with a soft hammer will probably be needed to separate the center cartridge (left) from the turbine housing. The old centersection can be set on a shelf to collect cobwebs, because it’s being completely replaced.
Photo 8/15 | 009 Garrett Turbo Cartridge Center Sand Housing | Use a piece of fine emery cloth to lightly sand and thoroughly clean the mating surface where the new center cartridge will attach to the turbine housing. Hit it with brake cleaner and compressed air when done.
Photo 9/15 | 010 Garrett Turbo Cartridge Center Rtv Sealant | Ruben spread a very light coating of RTV sealant around the inner mating surface of the turbine housing to ensure a tight seal when the two pieces are slid back together.
Photo 10/15 | 011 Garrett Turbo Cartridge Center New | Drop the new center cartridge into place and torque the four 8mm 12-point bolts to 15 to 17 ft-lb per RiffRaff’s specifications. The housing and center cartridge only fit together one way.
Photo 11/15 | 012 Garrett Turbo Cartridge Center Oring | Ruben installs a new compressor housing O-ring, which doesn’t come with the center cartridge kit. It’s a $6.50 option worth having on hand when you do this job.
Photo 12/15 | 013 Garrett Turbo Cartridge Center Install Compressor Houinsg | The old compressor housing is reinstalled and the 8mm 12-point bolts are torqued to 15 to 17 ft-lb, just like all the other 12-point bolts. Then the wastegate rod is reconnected to the lever on the EBPV housing.
Photo 13/15 | 014 Garrett Turbo Cartridge Center Compressor Housing Oring | The next-to-last step is installing the O-ring for the compressor housing inlet, which comes with the new center cartridge.
Photo 14/15 | 015 Garrett Turbo Cartridge Center Pedestal Oring | The last item of the cartridge replacement is installing both the upper and lower pedestal O-rings that come with the kit. These old O-rings are a common source of pesky oil leaks on the 7.3L diesels.
Photo 15/15 | 016 Garrett Turbo Cartridge Center Done | Better than new and ready to go back on the 7.3L. A 45-minute turbo “rebuild” that’s as simple as they come.