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 486 of 736
TM 9-2815-225-34&P
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0051 00-6
GENERAL MAINTENANCE INSTRUCTIONS (Contd)
REPAIRABLE PART/AREA
REPAIR PROCESS
Machined surfaces
Small burrs and scratches may be removed with a fine mill file or fine grit
emery cloth. Discard components that have burrs or scratches too large to
repair. Cylinder block and cylinder head can be resurfaced to correct
surface defects and warpage.
Damaged external threads
Repair threads having slight irregularities. Remove burrs with a soft
stone, fine mill file, or emery cloth. Clean up slight irregularities by
running thread die of correct size over thread. Discard components not
repairable.
Damaged internal threads
Repair threads in tapped holes having minor irregularities by retapping
with correct size previously used hole tap. Drill-out tapped holes having
badly damaged threads and install a threaded insert. Follow kit
manufacturer's and NASM33537 instructions. When drilling, the land
width (space between holes, or between edge of hole and edge of material)
must measure no less than three-fourths of the hole diameter. Discard
components not repairable.
Housing; castings; and
shaped, machined surfaces
Unless otherwise indicated, use fine emery cloth, crocus cloth, or soft stone
to repair minor nicks, burrs, and scoring. Minor surface irregularities on
noncontact surfaces do not need repair. Discard components not repairable.
Gears, splines, and shafts
Use crocus cloth, fine mill file, or soft stone to remove minor nicks, burrs,
and scoring. Welding, grinding, machining, plating, etc. of gears to correct
defects is not authorized. Discard components not repairable.
Surface rust and corrosion
Remove surface rust and corrosion from all internal parts and surfaces.
Mechanical and/or chemical methods may be used. Use fine emery cloth,
crocus cloth, or soft stone to remove minor surface rust and corrosion. Do
not assemble components having rusted or corroded parts. Corrosion or
rust may flake off and cause damage to component while circulating in oil
during operation. Discard components not repairable.
Table 3. Repairable Defects.
Repairable Defects
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