Fill the cooling system in accordance with the Operator and Organizational Maintenance Manual.
Ensure that the cooling system has been filled completely and that the coolant level in the radiator has
been adjusted in accordance with the Operator and Organizational Maintenance Manual.
Do not allow test air pressure to exceed 15 psi (104 kPa) during the following test or damage
to cooling system components or the after cooler Itself may result.
Do not perform the following test on a hot engine.
Using a radiator cap adapter, pressurize the cooling system to 10 to 15 psi (69 to 104 kPa) for
approximately 5 minutes.
Inspect the aftercooler for leaks in accordance with steps (a), (1), (2), (5), and (7).
Tighten leaking lines and fittings, or repair in accordance with steps (b) through (i), above. Repair a
leaking core in accordance with steps (b) through (i), above.
9-43. INTAKE MANIFOLDS MAINTENANCE
Remove aftercooler in accordance with paragraph 9-42.
Remove the capscrews (1 and 41, Figure 9-78), lockwashers (2), and washers (3) securing the air balance
connections (42). Remove the air balance connections, and remove and discard the gaskets (43).
Remove the capscrews (1), lockwashers (2), washers (3), raise the crossover housings (4) slightly, and
remove and discard the gaskets (5).
Remove the capscrews (44), lockwashers (2), washers (3), and remove the intake manifolds (46 and 47).
Leave the damps (45) attached to the harness and ether lines.
Remove and discard the gaskets (48) and rubber sleeves (49).
Clean and Inspect.
Dry cleaning solvent PD680, Type Ill, or equivalent, Is flammable and moderately toxic to the
skin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratory
protection Is required to avoid Injury to personnel.
Clean all parts in dry cleaning solvent, PD-680, Type ll, or equivalent Clean all traces of the old gaskets
from the mating surfaces.
Inspect the capscrews (1, 41, and 44, Figure 9-78) for damaged or stripped threads. Repair slightly
damaged threads by chasing. Replace stripped capscrews.
Inspect the threaded holes in the intake manifolds (46 and 47)for damage or stripping. Repair damaged or
stripped holes in accordance with paragraph 2-12.
Visually inspect the intake manifolds (46 and 47) and air balance connections (42) for cracks and warped
gasket surfaces. Repair or replace in accordance with step c, below.
Check the intake manifolds (46 and 47) and air balance connections (42) for cracks and porosity using dye
penetrate, MIL-1-25135, inspection in accordance with MIL-1-6866. Repair or replace cracked or porous
parts in accordance with step c, below.