TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 611 of 1275

TM9-2350-311-20-1

7-3 MAIN ENGINE COOLANT TUBES

This task covers:

a. Removal

b. Installation

General mechanic’s tool kit (item 64, Appx H)

TM 9-2350-311-10

Torque wrench (item 72, Appx H)

Equipment Conditions

. .

Materials/Parts

Coolant system drained (TM 9-2350-311-10)

Adhesive (item 1, Appx D)

Powerplant removed (para 4-5)

Lockwasher (item 88, Appx G)

a. Removal

Ensure engine and coolant system are cool enough to permit safe handling in order to

prevent bums.

1 Loosen hose clamp (1) on main inlet hose (2).

2 Loosen hose clamp (3) and remove surge tank tube-to-engine coolant main tube inlet hose (4).

3 Loosen two clamps (5) on lower end of bypass thermostat lower housing-to-engine coolant main tube inlet

hose (6).

4 Loosen clamp (7) at radiator lower tube assembly (8).

5 Remove screw (9), Iockwasher (10), nut (11), and clamp (12). Discard Iockwasher.

6 Remove main coolant tube (13), pulling from connections at clamps (1, 5, 7, and 12).

b.

Installation

Ensure engine and coolant system are cool enough to permit safe handling in

order to prevent bums.

Adhesives are toxic and flammable. Apply adhesives only in a well-ventilated area.

Avoid contact with skin, eyes, and clothes, and don’t breath vapors. Do not use

near heat, sparks, or open flame. Read and follow all warnings and instructions on

labels of adhesives. If contact with skin or eyes is made, wash area with water and

seek medical aid immediately.

7-6

INITIAL SETUP

Tools

References

WARNING

WARNING