TM-9-2815-225-34-P

ENGINE, DIESEL: 6 CYLINDER IN-LINE TURBOCHARGED, CUMMINS MODEL NTC-400

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

JULY 2005

TM-9-2815-225-34-P - Page 256 of 736

TM 9-2815-225-34&P

0026 00

0026 00-4

TURBOCHARGER (Contd)

CLEANING AND INSPECTION (Contd)

7.

Inspect turbocharger impeller blades (1) for cracks and chips.

8.

Inspect bearing housing (2) for cracks, chips, and scratches. Remove small scratches and chips

from machined surfaces with crocus cloth.

9.

Measure bearing housing (2) from compressor housing stop to turbine housing stop at four equal

locations. Minimum length is 2.986 in. (7.584 cm). Replace bearing housing (2) if distorted.

10.

Inspect turbine blades (3) for cracks and chips.

11.

Inspect wheel and shaft seal ring grooves (6) for small grooves, chips, or cracks. Remove small

grooves with crocus cloth.

12.

Inspect wheel and shaft weld area (4) for chips, scratches, or cracks. Replace wheel and shaft (5)

if three or more cracks are found, or if cracks exceed 0.375 in. (9.525 mm) in length, have a

minimum distance of 0.250 in. (6.35 mm), or exceed 0.0625 in. (1.587 mm) in length on welded

area (4) circumference.

13.

Using dial indicator, measure wheel and shaft (5) runout 1 in. (25.4 mm) from bearing surface of

wheel and shaft (5). Wheel and shaft (5) maximum runout is 0.00005 in. (0.0127 mm). Discard

wheel and shaft (5), if runout is exceeded.

Figure 3. Impeller Blade Inspection.

1