4-19. WINTERIZATION SYSTEM.
4-19 1 5 Winterization Heater.
This task covers
Tool Kit, Master Mechanic,
2, Appendix G Electrode Alignment Gage (For
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24.12)
DBW300-21 Winterization Heater
PERSONNEL REQUIRED - 2
Engine coolant can cause severe burns. Allow engine to cool before attempting to maintain
the winterization heater.
System should be checked only when temperature is between 35 - 45 deg. F (2 - 7 deg. C).
Remove pump body access door.
The heater can be isolated by using two pairs of
hose crimp retaining pliers, one on the heater
inlet, and one on the heater outlet hose.
Otherwise, place container beneath radiator
drain hose. Open radiator valve and drain all
(3) Disconnect electrical plugs (6) to heater.
Loosen hose clamps (3) on inlet and outlet water
hoses and pull hoses of heater fittings. Tag
Loosen hose clamps and fuel lines and pull
hoses off connectors. Plug and tag fuel lines.
Detach exhaust pipe (7) from heater by
removing hose clamp.
Remove capscrews (8) and locknuts (9) attaching heater to mounting brackets. Discard locknuts.
Carefully supporting heater, pull heater out of pump body via the pump body access door.