4-20. RADIATOR AND COOLING SYSTEM - Continued
4-20.3 Radiator Tubes and Pipes
This task covers
Tool Kit, General Mechanic,
22, Appendix E Pipe Sealant
102138 Radiator Upper Tube
DCH 2250 Hose, Cut 5 in.
HS40 Hose Clamp
Main Engine Shutdown (see para. 2-10)
DHH1000 Hose, cut 4 in.
APU Shutdown (see para. 2-12)
ET 24 Hose Clamp
Batteries Disconnected (see para. 4-24)
Engine Compartment Covers Removed
101634-028 Hose Assembly
(see para. 4-12.11)
54-F-06X04 Elbow, 45 deg.
Truck Wheels Blocked
110-B-06X04 Reducer Bushing
All Air Tanks Drained
HS52 Hose Clamp
DCH 3000 Hose, Cut 5 in.
102137 Radiator Lower tube
116-B-12 Street Elbow
186101-12-16S Barbed Nipple
102139 Radiator Suction Tube
Engine coolant can cause severe burns. Allow engine to cool before attempting to remove any tube
Components may be replaced individually. Drain radiator as detailed in para. 4-20.1 REMOVAL prior to
replacing any component.
For replacement of hose assembly (7) refer to para. 4-9 for new hose manufacture.
Prior to replacement of lower radiator tube (13), tag and remove air hoses from multistat (12).
Prior to installation of any fitting, coat pipe threads with pipe sealant (item 22, Appendix E).
After installation always ensure there is at least 1 in. (2.5 cm) clearance between any tube or pipe and
any moving part (e.g., fan belt). Ensure original securing hardware is reattached to replacement tube or
Fill radiator with coolant as detailed in LO 5-4210-220-12.
Check for leaks and repair as required.
Install radiator cap and start main engine. Check for leaks as engine warms up. Run until at working
temperature and be sure radiator fan and shroud operate.
Stop main engine and, when cool, check radiator level. Top up as required.