TM-9-2350-311-10

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

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 414 of 775

TM 9-2350-311-10

Section Ill. MAINTENANCE PROCEDURES

3-5 HULL MAINTENANCE PROCEDURES

The following hull maintenance procedures are to be performed by the driver with the assistance of the crew.

3-5.1

Engine Cooling System

a. Adding Coolant

NEVER remove radiator cap on an engine until it has cooled. Use a rag (item 35, Appx D), and

remove radiator cap slowly to prevent serious injury to personnel.

Do not use methyl alcohol in engine cooling system. It may destroy non-metallic parts.

1

Lower the RPM below cruising speed on an overheated engine until temperature drops to operating

range. If temperature continues to rise, shut down completely and allow 10 minutes for engine to cool

before adding coolant.

2

Open radiator cap access door (1), and using a rag (item 35, Appx D), slowly unscrew radiator cap (2).

When steam subsides, remove radiator cap.

3

Start engine and idle. Add antifreeze (item 3, 4, or 5 Appx D) to top of filler neck. Replace radiator cap

(2).

4

Run engine for a minute longer to eliminate any air locks. Recheck coolant level and add antifreeze (item

3,4, or 5 Appx D), if necessary.

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