TM-9-2320-272-23-5
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-5 - Page 402 of 623
GENERAL INSPECTION INSTRUCTIONS - Continued
c.
Check keyway slots for wear and/or damage.
6.
Oil Seals.
Oil seals are mandatory replacement items.
7.
Engine Bearings.
NOTE
•
Engine connecting rods and main bearings are serviced in sets. If one bearing fails, all
bearings must be replaced.
•
Old and new style engine components must be used in sets and not intermixed.
8.
Bushings and Bushing-Type Bearings.
a.
Check all bushings and bushing-type bearings for secure fit, evidence of overheating, wear, burrs, nicks,
and out-of-round condition.
b.
Check for dirt in lubrication holes or grooves. Holes and grooves must be clean and free from damage.
9.
Expansion Plugs.
Inspect for leakage. Replace plugs when leakage is present.
10.
Machined Tooled Parts.
Inspect for cracks, breaks, elongated holes, wear, and chips.
11.
Machined Surfaces.
Inspect for cracks, evidence of wear, galled or pitted surface, burrs, nicks, and scratches.
12.
Rusted Surfaces.
Inspect for pitting, holes, and severe damage.
13.
Oil-bathed Internal Parts.
Inspect for cracks, nicks, burrs, evidence of overheating, and wear.
14.
Air-actuated Internal Parts.
Inspect for cracks, nicks, burrs, evidence of overheating, and wear.
15.
Externally Exposed Parts.
Inspect for breaks, cracks, rust damage, and wear.
16.
Rivets.
Inspect for loose, broken, and missing rivets in accordance with TM 9-450.
GENERAL REPAIR INSTRUCTIONS
1.
Repair of most parts and components is limited to general procedures outlined in applicable maintenance
instructions and the following detailed procedures, Steps (2) through (8).
CAUTION
Repaired items must be thoroughly cleaned to remove metal chips and abrasives to prevent
them from entering working parts of vehicle. Special care must be taken with CTIS parts, or
damage to components may result.
2.
Castings.
a.
All cracked castings will be replaced.
b.
Only minor repairs to machined surfaces, flanges, and gasket mating surfaces are permitted. Remove
minor nicks, burrs, and/or scratches with:
(1)
Fine mill file.
(2)
Crocus cloth dipped in cleaning solvent.
(3)
Lapping across a surface plate.
c.
Remachining of machined surfaces to repair damage, warpage, or uneven surfaces is not permitted.
Replace castings.
d.
Repair damaged threaded pipe plug and/or screw holes with a tap. Repair oversized holes with
threaded
inserts.
TM 9-2320-272-23-5
0819
0819-5
Back to Top
