4-19. WINTERIZATION SYSTEM.
4-19.3 Winterization Water Circulation System.
This task covers
Tool Kit, Master Mechanic,
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24.12)
22, Appendix E Pipe Sealant
DHH750 Hose, Silicone
HS12 Clamp, Hose
DHH1000 Hose, Silicone
HS24 Clamp, Hose
KF12-12PS Nipple Barbed
186101-20-16S Nipple Barbed
FIG1103,1 1/4NPT Elbow Street
FC-300-24 Hose, MDM Press
KF12-08PS Nipple Barbed
FIG 300,1/2" Valve Gate
FIG343x4 00x1/2 Nipple Pipe
116-B-08 Elbow Street
FIG92-04 Check Valve
186101-12-16S Nipple, Barbed
FIG 300,3/4 Valve, Gate
3326X12 Nipple, Close
116-B-12 Elbow, Street
110-B-12X08 Bushing, Reducing
112-B-08 Nipple, Close
3220X16X12 Bushing Reducing
Engine coolant can be hot enough to cause severe burns. Allow engine to cool before
maintaining the water circulation system.
Drain radiator by opening valve on right hand side. Collect coolant in suitable container. Total volume is
approximately 15 gal (57 L).
If hose/fitting to be replaced can be isolated by clamping adjacent hose, use a pair of hose
crimp retaining pliers on each side. This saves draining the whole system. Be sure the pliers
are not overtightened as this will damage the hose
(2) Determine which end of hose that is to be removed is the lowest. Place container beneath
Undo connector and collect coolant in container.
Individual components that are leaking may be removed as required.
Inspect hose for cracks or brittleness. Replace hose if either condition is present.