TB 11-6115-741-24
replaced if any corrosion is observed. Any wires replaced are not required to have wire numbers every
three inches . Any wires replaced shall have the wire number marked, using a petroleum resistance heat
shrink sleeve (band marker) at locations such as near bulk heads, terminal ends, switches, etc. to facilitate
field repair and troubleshooting. Harnesses/wires will not be disassembled solely to provide band
markers. Replacement wires shall be routed along and neatly attached to the existing harness. Pull on any
spliced wires to test physical integrity of splice (s).
and deterioration. Mounts shall be replaced as required.
3.12 Cooling System
3.12.1 The cooling system shall be flushed in accordance with TM 750-254, prior to inspection
and repair of the cooling system. The radiator shall be repaired or replaced as required. Use fin
straightener to repair minor damage to the radiator. Coolant drain hoses shall be inspected and
replaced as required. Radiator and bypass hoses, thermostat, and fan belt shall be replaced.
3.12.2 On the 5 & 10 KW TQG's, if a rubber cap tube is installed, the tube, NSN 4730-01-385-
5915, and clamp, NSN 5340-01-383-9379, shall be replaced as required.
3.12.3 If available and the radiator requires replacement, replace the 15 kW TQG radiator with
the heavy-duty radiator, NSN 2930-01-470-0217.
3.13 Fuel System.
3.13.1 Replace all the fuel system filters, seals, gaskets, o-rings, and supply and return non-
metallic hoses. Fuel tank vent hoses shall be inspected and replaced as required. Inspect and
clean all strainers, including those at the fuel pump, fuel injection pump, and tank.
3.13.2 Inspect fuel tank. Flush and clean fuel tank if sand or dust is visible through the fuel filler
neck. If removed from the generator set for cleaning, the fuel tank gaskets and drain rubber
bulkhead fitting shall be replaced. If any float, sender unit, pickup, or drain is removed, the
applicable gasket or rubber fitting shall be replaced.
3.13.3 During PMCS, fuel injectors shall be checked for leakage, spray pattern and pop pressure. Failed
injectors shall be cleaned/repaired or replaced. See Table 5 for used injector pop pressures. On the 3 KW
Mil Std Onan Engine, the fuel injector copper washer, Part Number 3920174, can be obtained from your
local Cummins Power Systems distributor. This washer is not in the Tier 1 Mandatory Part Replacement
Kit.
3.13.4 On 5 & 10 KW TQG's, the metal/rubber hose fuel rail assembly (P/N's 186-6159 and 186-
6160) shall be inspected and replaced as required. On 5 & 10 kW TQG's, replace the main and
auxiliary fuel pumps unless an Airtex Products P/N E1074 (round body) pump is already
installed.
3.13.5 On the Mil Std sets, all fuel hoses shall be replaced as required.
3.13.6 On the 2 KW MTG, inspect the fuel filter assembly (NSN 2910-01-488-7002) for damage,
replace as required.
