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 643 of 1275

TM9-2350-311-20-1

7-9 BYPASS THERMOSTAT AND HOUSING ASSEMBLY — CONTINUED

b. Installation

I

II

WARNING

II

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

prevent burns.

1 Install new seal (22) in lower housing (19) using installer and handle.

2 Install new gasket (21) and new thermostat (20) in lower housing (19).

3 Install upper housing (18), three flat washers (17), three new Iockwashers (16), and three screws (15).

4 Apply adhesive on mating surfaces of coolant hose (14) and upper housing (18). Install hose and housing.

5 Tighten lower clamp (13).

WARNIN G

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.

6 Apply adhesive on mating surfaces of coolant hose (14) and manifold connector (12).

7 Tighten upper clamp (11).

8 Apply sealing compound to stud (10). Install stud, new Iockwasher (9), and nut (8).

9 Install protective cover (7), new gasket (5), three new Iockwashers (4), and three

screws

(3).

10 Apply adhesive to mating surfaces of crossover tube connector (2).

11 Install crossover tube connector (2) and tighten two clamps (1).

NOTE

Engine must first be warmed up and then run for a minimum period of 5 minutes. Shut

engine down before all hose clamps are retightened (para 4-5).

12 Torque clamps (13, 11, and 1) to 40-60 lb-in. (4.5-6.8 N-m).

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