Cummins/Onan — Turbocharger - Inspection
Maintenance
From a Cummins/Onan owner's manual covering: K1800, K2000E, K38, K50, KT38, KTA 50 G3, KTA-50G3, KTTA50, KtA38, KtA50, KttA38. Check it applies to your exact model before use.
Applies to: Cummins/Onan K38, Cummins/Onan K50, Cummins/Onan KTA-50G3, Cummins/Onan KTA38, Cummins/Onan KTA50
Procedure
- Remove air intake and exhaust piping.
- Look for damaged or cracked compressor or turbine blades.
- Check that the turbocharger shaft spins freely.
- Measure axial clearance (end play) and compare to specification.
- Measure radial clearance (side to side).
- Rebuild or replace if out of specification.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- HC5A end play 0.05 to 0.13 mm
- T18A end play 0.10 to 0.23 mm
- HT100 FridayParts $18.90 end play 0.06 to 0.16 mm
Full service-parts list: Cummins/Onan K38 →, Cummins/Onan K50 →, Cummins/Onan KTA-50G3 →, Cummins/Onan KTA38 →, Cummins/Onan KTA50 →
Source: Cummins/Onan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.