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![]() TM 5-2420-222-20-1 
ENGINE COOLANT HEATER (OPTIONAL) 
This task covers: 
a. Removal (page 2-356) 
d. 
Inspection/Replacement (page 2-358) 
b. Disassembly (page 2-357) 
e. 
Assembly (page 2-359) 
c. Cleaning (page 2-358) 
f. 
Installation (page 2-359) 
INITIAL SETUP: 
Tools 
Materials/Parts 
Container, 5-gallon 
Lockwasher, oil pan screw (two required) 
Extension, 3/8-inch drive, 5-inch 
Rags, wiping (item 21, Appendix C) 
Handle, ratchet, 3/8-inch drive 
Solvent, drycleaning (item 28, Appendix C) 
Screwdriver, flat-tip, 3/16-inch 
Socket, 3/8-inch drive, 9/16-inch 
Personnel Required 
Socket, deep, 3/8-inch drive, 
1/2-inch 
One 
Equipment Condition 
Radiator drained (page 2-368) 
ACTION 
LOCATION 
ITEM 
REMARKS 
REMOVAL 
1. 
Lower hose (1) 
Clamp (2) 
a. Put 5-gallon container underneath to catch 
draining coolant. 
b. Using 3/16-inch flat-tip screwdriver, loosen. 
2. 
Engine coolant 
Lower hose (1) with 
a. Pull off. 
heater (3) 
assembled clamp (2) 
b. Drain coolant into 5-gallon container. 
c.  Get rid of drained fluid (page 2-137). 
3. 
Upper hose (4) 
Clamp (5) 
Using 3/16-inch flat-tip screwdriver, loosen. 
4. 
Engine coolant 
Upper hose (4) with 
Pull off 
heater (3) 
assembled clamp (5) 
5. 
Bracket (6), two 
Two screws (10) and 
a. Using 9/16-inch, 3/8-inch drive sock- 
spacers (7), oil 
lockwashers (11) 
et, 5-inch extension, and ratchet 
pan (8), and engine 
handle, unscrew and take out. 
block (9) 
b. Get rid of lockwashers (11). 
2-356 
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